Entries |
Document | Title | Date |
20080204013 | LOGGING METHOD FOR DETERMINING CHARACTERISTIC OF FLUID IN A DOWNHOLE MEASUREMENT REGION - For use in logging downhole in an earth borehole, a method for determining a characteristic of oil that may be present in a downhole measurement region, includes the following steps: providing a plurality of crude oil samples; determining the viscosities of the crude oil samples; performing test measurements, using a predetermined operating mode, on media including the crude oil samples to obtain test data; applying a test processing procedure to the test data to obtain an output test parameter relating to the test data and the predetermined operating mode; deriving, for the plurality of crude oil samples, a correlation relating the output test parameter to the viscosities of the crude oil samples; performing downhole measurements in the measurement region with a logging device, operated with substantially the predetermined operating mode, to obtain logging data, and applying a measurement processing procedure to the logging data to obtain an output logging parameter; and determining the oil characteristic using the output logging parameter and the correlation. | 08-28-2008 |
20080224696 | Nuclear quadrupole resonance logging tool and methods for imaging therewith - An instrument for investigating properties of an earth formation includes a body housing a nuclear quadrupole resonance (NQR) probe, the probe having at least one coil wound around a core material and an electronics coupling, the body being adapted for insertion into a wellbore within the earth formation. A method and computer program product are provided. | 09-18-2008 |
20080315873 | Method and Apparatus for Measuring Free Induction Decay Signal and Its Application to Composition Analysis - A method to obtain a free induction decay signal using includes inducing a static magnetic field in a sample volume. A radio frequency (RF) magnetic field is then induced in the sample volume. The RF magnetic field has parameters selected to minimize the contribution of inhomogeneity to the static magnetic field to a free induction decay time. The free induction decay signal is then detected from the sample volume. In one example, prior to inducing the RF magnetic field, a reorienting radio frequency magnetic field is induced in the sample volume to reorient magnetic spins by a first selected angle. The inducing the RF magnetic field in this example has parameters selected to reorient spins by a second angle. The inducing the RF magnetic field and detecting the free induction decay signal are repeated until nuclear magnetic equilibrium is substantially attained. | 12-25-2008 |
20090015253 | SYSTEM AND METHOD IMPLEMENTING INHERENTLY CONDUCTING POLYMERS FOR DOWNHOLE APPLICATIONS - Embodiments of conductive polymers and instruments using the conductive polymers in geophysical exploration are provided. Methods for fabrication are included. | 01-15-2009 |
20090015254 | Demagnetizer to Eliminate Residual Magnetization Produced by Nuclear Magnetic Resonance Logs - An apparatus and method is disclosed for measuring a parameter of an earth formation surrounding a wellbore. A Nuclear Magnetic Resonance (NMR) tool and at least one second tool are conveyed in the wellbore on a wireline, the NMR tool having a magnetic influence on a region of the wellbore. The magnetic influence of the NMR tool is removed from the region of the wellbore using a demagnetizing device. The parameter of the earth formation is measured using the at least one second tool. A second demagnetizing device may be used to remove the magnetic influence of the at least one second tool from the region of the wellbore. | 01-15-2009 |
20090051359 | SYSTEM AND METHOD FOR MEASURING FORMATION TEMPERATURE AND/OR PRESSURE USING NUCLEAR QUADRUPOLE RESONANCE - A system for measuring at least one of a temperature and a pressure of an earth formation is disclosed. The system includes: a downhole tool disposed in a borehole and configured to be movable within the borehole; at least one nuclear quadrupole resonance (NQR) measurement device including a transmitter configured to emit a radiofrequency magnetic field having at least one selected frequency band into the earth formation to cause a component thereof to produce a NQR signal, and a detector configured to detect the NQR resonance signal; and a processor in operable communication with the measurement device and configured to generate NQR data from the NQR signal and calculate at least one of the temperature and the pressure of the earth formation therefrom. A method of measuring at least one of a temperature and a pressure of an earth formation is also enclosed. | 02-26-2009 |
20090058415 | METHOD AND APPARATUS OF USING CROSSED MAGNETIC FIELDS FOR MEASURING CONDUCTIVITY, PERMEABILITY AND POROSITY - When a static magnetic field and a crossed oscillating field are applied, the deformation rate at a boundary between a fluid and a porous medium depends on the amplitudes of the applied magnetic fields (to be exact, on their product), electric conductivity, porosity, and permeability. Knowing two of the three enables determination of the third. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b). | 03-05-2009 |
20090058416 | Method and Apparatus for NMR Saturation - Saturation pulse sequences are designed to ensure complete saturation of nuclear spins for dual wait time measurements and saturation recovery measurements in the case of axial motion of a downhole NMR logging tool. Frequency and/ or phase modulation may be used. An auxiliary saturation coil may be used. | 03-05-2009 |
20090066327 | METHOD AND COMPUTER PROGRAM PRODUCT FOR ESTIMATING TRUE INTRINSIC RELAXATION TIME AND INTERNAL GRADIENT FROM MULTIGRADIENT NMR LOGGING - A method and a computer program product for estimating the true intrinsic relaxation time T | 03-12-2009 |
20090072824 | Nuclear magnetic resonance evaluation using independent component analysis (ICA)-based blind source separation - Disclosed is a non-lineal statistical independent component (ICA) analysis methodology for calculating T2 or T1 distributions of nuclear magnetic resonance logs. In one aspect, the invention employs a classical blind source separation (BSS) approach with the input data (T2 or T1 distributions) being considered not only horizontally (in relaxation time units), but also vertically (in depth). The statistical variations are used for separating the principal independent components and their corresponding weighting matrix. The result of such ICA based BSS is an efficient separation of T2 components correlative to the presence of particular conditions (e.g., clay bound water, heavy oil, capillary bound water, free water, mud filtrate (water and oil), and noise). Individual saturation of estimated fluids can be calculated from the weighting matrix generated in accordance with the invention. In accordance with a further feature of the invention, it is contemplated that independent component analysis techniques may be applied to the underlying time domain data prior to its transformation to a T2 distribution. This advantageously results in “de-noising” of the signal, leading to more precise and accurate results following analysis of the T2 distribution. | 03-19-2009 |
20090072825 | SYSTEMS AND METHODS FOR DEEP-LOOKING NMR LOGGING - An NMR logging tool for conducting NMR measurements in a plurality of sensitive volumes ranging up to a meter from the tool. The tool comprises a magnetic assembly using one or more permanent magnets and at least one pole piece for extending a magnet pole and shaping the magnetic field to simulate a magnetic monopole in a sensitive volume within the formation. Different embodiments of a segmented antenna enable directional NMR logging. The tool embodiments and methods of their use are suitable for wireline or LWD logging, and can be used for directional drilling. | 03-19-2009 |
20090091320 | Methods and Apparatus for Monitoring a Property of a Formation Fluid - Methods and apparatus for the characterization of formation fluids are disclosed. A downhole tool disposed in a borehole penetrating a subterranean formation obtains a NMR measurement, effects a change in a characteristic of the formation fluid, and obtains another NMR measurement subsequent to the change. Alternatively, the downhole tool effects a radial gradient of a characteristic of the formation and obtains NMR measurements at two or more selected radial distances from the wellbore wall. A parameter representative of the subterranean formation or the formation fluid is further determined from the NMR measurements. | 04-09-2009 |
20090102478 | CONFIGURABLE MAGNET ASSEMBLY FOR USING IN NMR WELL LOGGING INSTRUMENT - A magnet assembly for measuring properties of a formation from a borehole, the magnet assembly including a first device and a second device, each device adapted for insertion into the borehole, the first device producing a first magnetic field, the second device producing a second magnetic field; wherein the second magnetic field is configurable for one of reinforcing and reducing the first magnetic field; and wherein the first device comprises a permanent magnet and the second device comprises at least one of one of a switchable magnet and switching windings. | 04-23-2009 |
20090121711 | THERMALLY STABILIZED MAGNETS FOR USE DOWNHOLE - A logging instrument for estimating a property of a formation penetrated by a borehole, the instrument having a magnet disposed at least one of at and in the instrument wherein the magnet exhibits a magnetic field of “substantially” constant magnitude over a range of temperatures in the borehole. | 05-14-2009 |
20090128144 | High Pressure/High Temperature Magnetic Resonance Tool - The present invention pertains to an apparatus and method for conducting magnetic resonance measurements on fluids at high pressures and/or high temperatures. The apparatus can be used in conjunction with or as part of a downhole fluid sampling tool to perform NMR measurements on fluids withdrawn from petroleum reservoirs, or can also be used for laboratory measurements on live reservoir fluids. The apparatus can perform all of the measurements made by modern NMR logging tools, including multi-dimensional distribution functions of spin-spin (T | 05-21-2009 |
20090167302 | Time-Lapsed Diffusivity Logging for Monitoring enhanced Oil Recovery - The use of time-lapsed NMR diffusivity measurements in an observation well is disclosed. The observation well is cased in the zone of interest with non-magnetic and non-conductive casing that is invisible to the NMR tool. Second, because NMR measurements have a dead zone in front of the antenna depending on the spatial variation of the fixed magnet strength, for example about 2.7 inches, a distance between the casing and the formation is reduced to less than the dead zone length by drilling the observation well at small deviation of about 5° and running the casing without centralizers. Both the casing and the pad-type NMR tool will follow the low side of the borehole, ensuring the measurement volume of the NMR tool is inside the formation and beyond the annulus. With the appropriate observation well completion, time-lapse diffusivity measurements with pad-type NMR tools can address several shortcomings in the current practice of monitoring EOR processes that rely upon changes in density and hydrogen index (HI). Various uses of NMR imaging in wells cased with non-metallic casing are also disclosed. | 07-02-2009 |
20090174402 | Joint Compression of Multiple Echo Trains Using Principal Component Analysis and Independent Component Analysis - NMR spin echo signals are acquired downhole. Principal Component Analysis is used to represent the signals by a weighted combination of the principal components and these weights are telemetered to the surface. At the surface, the NMR spin echo signals are recovered and inverted to give formation properties. | 07-09-2009 |
20090189604 | Methodology For Interpretation and Analysis of NMR Distributions - Pulse sequences are applied to a fluid in an earth formation in a static magnetic field and NMR spin echo signals are obtained. The signals are inverted to give T | 07-30-2009 |
20090195246 | METHOD FOR ESTIMATING INSITU FLUID VELOCITY FROM NMR MEASUREMENTS - A method for estimating a viscosity of a fluid in a rock formation, the method including: performing a first nuclear magnetic resonance (NMR) measurement with zero magnetic field gradient on at least a portion of a sample of the rock formation to obtain a first distribution of transverse relaxation time constants; estimating a first diffusive couple factor from the first distribution; replacing the fluid of the at least a portion of the sample with another fluid; performing a second NMR measurement with zero magnetic field gradient on the at least a portion of the sample containing the another fluid to obtain a second distribution of transverse relaxation time constants; estimating a second diffusive couple factor from the second distribution; and estimating the viscosity of the fluid using the first diffusive couple factor and the second diffusive couple factor. | 08-06-2009 |
20090206834 | METHOD FOR ESTIMATING FORMATION HYDROCARBON SATURATION USING NUCLEAR MAGNETIC RESONANCE MEASUREMENTS - A method for estimating fluid saturation in a formation penetrated by a wellbore from nuclear magnetic resonance measurements made at a plurality of lateral depths into the formation from the wellbore includes estimating a bound water volume, a total porosity and a free water volume at each of the lateral depths from the nuclear magnetic resonance measurements. A minimum water saturation is estimated at each lateral depth from the total porosity, the free water volume and the bound water volume at each lateral depth. A value of water saturation is estimated at each lateral depth from the minimum water saturation at each lateral depth. A relationship between lateral depth and water saturation is determined. Water saturation is estimated at a selected lateral depth greater than the greatest lateral depth of the nuclear magnetic resonance measurements. | 08-20-2009 |
20090219019 | DOWNHOLE MICRO MAGNETIC RESONANCE ANALYZER - A downhole micro MR analyzer for use in a wellbore, having a micro sample tube, a micro RF coil in close proximity to the micro sample tube, and one or more magnets disposed about the micro sample tube is disclosed. The micro MR analyzer can be used for nuclear magnetic resonance or electron spin resonance experiments to ascertain formation properties and chemical compositions. | 09-03-2009 |
20090289627 | METHOD OF DETERMINING A FORMATION PARAMETER - A method of measuring a parameter characteristic of a rock formation is provided, the method including the steps of deploying in a section of a well penetrating the rock formation a toolstring combining a tool for generating and measuring responses to a sensing field at different radial depth shells in the rock formation relative to the well and a tool to cause a flow of fluid through the different radial depth shells such that responses to the sensing field are obtained for at least two different radial depth shells and for at least two different flow conditions in said at least two different radial depth shells to determine a radial depth dependent profile of said parameter. | 11-26-2009 |
20090289628 | DETERMINATION OF OIL VISCOSITY AND CONTINUOUS GAS OIL RATIO FROM NUCLEAR MAGNETIC RESONANCE LOGS - A method for determining oil viscosity and continuous gas-oil-ratio (GOR) from nuclear magnetic resonance logs (NMR). The method includes obtaining a set of NMR data of a portion of the subterranean formation from inside the wellbore without acquiring formation fluid sample; isolating a quantitative reservoir fluid information associated with oil from oil based mud (OBM) using radial profiling of the set of NMR data, wherein the OBM is used for extracting fluid from the underground reservoir; determining GOR related information associated with the portion of the subterranean formation from the quantitative reservoir fluid information associated with oil, wherein the GOR related information is determined based on a predetermined model; and performing operations for the oilfield based on the GOR related information. | 11-26-2009 |
20090309591 | DISPLACED ELECTRODE AMPLIFIER - A displaced electrode amplifier (“DEA”) for measuring signals from high impedance sources. The amplifier may include an operational amplifier (“op-amp”) configured as a unity gain buffer, with a feedback path to the non-inverting input to at least partly compensate for a parasitic input shunt impedance. In cases where the device is to measure AC signals in high ambient temperatures, the non-inverting input may be coupled via a large resistance to a ground reference that is driven with a second feedback signal to magnify the effective value of the large resistance. Where a differential configuration is desired, one or more tuning resistors may be provided to match responses of different input buffer stages, thereby maximizing the common mode rejection. The disclosed amplifier is suitable for use in oil-based mud resistivity imaging tools but is also suitable for other applications. | 12-17-2009 |
20100026293 | METHOD FOR ESTIMATING FORMATION SKIN DAMAGE FROM NUCLEAR MAGNETIC RESONANCE MEASUREMENTS - A method for determining skin factor of a subsurface rock formation from within a wellbore drilled therethrough includes measuring a nuclear magnetic resonance property of the formation at a plurality of lateral depths therein. The measured nuclear magnetic resonance property is used to estimate the skin factor. | 02-04-2010 |
20100033176 | METHODS FOR DETERMINING IN SITU THE VISCOSITY OF HEAVY OIL - Viscosity of heavy oil is determined in situ in a formation by making nuclear magnetic resonance (NMR) measurements in the formation, and then calculating viscosity according to an equation of the form | 02-11-2010 |
20100039109 | METHODS FOR DETERMINING IN SITU THE VISCOSITY OF HEAVY OIL USING NUCLEAR MAGNETIC RESONANCE RELAXATION TIME MEASUREMENTS - The viscosity η (in centipoise) of a heavy oil sample is determined according to an equation of the form ln | 02-18-2010 |
20100109664 | METHOD FOR ESTIMATING THE FORMATION PRODUCTIVITY FROM NUCLEAR MAGNETIC RESONANCE MEASUREMENTS - A method for estimating fluid productivity of a subsurface rock formation from within a wellbore drilled therethrough includes measuring a nuclear magnetic resonance property of the formation at a plurality of lateral depths therein. The measured nuclear magnetic resonance property is used to estimate the fluid productivity. | 05-06-2010 |
20100127701 | METHOD AND SYSTEM FOR FLUID CHARACTERIZATION OF A RESERVOIR - A method for determining fluids in a formation. The method includes obtaining open hole measurements for a borehole in the formation; identifying points in the borehole from which to obtain pressure measurements using the open hole measurements; obtaining pressure measurements at the identified points in the borehole; applying an excess pressure technique to the pressure measurements to identify a plurality of pressure compartments in the borehole; characterizing fluid in each of the plurality of compartments; and developing a drilling plan based on characterization of fluids in each of the plurality of compartments. | 05-27-2010 |
20100156409 | METHOD FOR DETERMINING THE CONTENT OF LIQUID AND SOLID PHASE COMPONENTS IN HYDROCARBON MIXTURE - The method for a hydrocarbon mixture composition determination includes the collection of at least one sample of the hydrocarbon mixture. For this sample, a nuclear magnetic resonance method is used for measuring series of hydrocarbon mixture's free inductance decrement curves within a temperature range of −150° C. to +150°. Each free inductance decrement curve is then used to determine the solid component fraction P | 06-24-2010 |
20100182004 | HIGH-RESOLUTION WIRELINE NUCLEAR MAGNETIC RESONANCE TOOL - A nuclear magnetic resonance well logging tool, where some embodiments comprise two, oppositely oriented magnets separated by a pole piece to guide static magnetic flux into a sensitive volume, and another pole piece serving as a core for several antennas For some embodiments, the antennas are solenoids Two of the antennas serve as transmit and receive antennas, where they are driven to generate an elliptically polarized magnetic field, and their antenna responses are combined so that the combined response is sensitive to elliptically polarized magnetic fields, but with zero gradient in the z-direction A third antenna is a receive antenna sensitive to magnetic field vectors having a sinusoidal spatial venation in the z-direction of period equal to the length of the third antenna A fourth antenna serves as a receive antenna sensitive to sinusoidal magnetic field vectors with the same spatial-frequency as the third antenna, phase shifted by 90 degrees. | 07-22-2010 |
20100188080 | NMR-LWD IMAGING TOOL - An apparatus for estimating a nuclear magnetic resonance (NMR) property of an earth formation penetrated by a borehole, the apparatus including: a logging tool having a source of a static magnetic field configured to polarize a region of investigation in the earth formation; a transmitter antenna disposed at the logging tool and configured to transmit electromagnetic energy into the region of investigation; at least one receiver sensor disposed at the logging tool and configured to receive NMR signals from the region of investigation in response to an interaction between the static magnetic field and the transmitted electromagnetic energy; and a processor configured to: receive the NMR signals from the at least one receiver sensor; associate the NMR signals received from the at least one receiver sensor with an azimuthal direction at which the NMR signals were received; and estimate the property from the NMR signals and the associated azimuthal directions. | 07-29-2010 |
20100201358 | ACOUSTIC MODIFIED NMR (AMNMR) - Many reservoirs of interest include heavy oil. In such reservoirs, NMR measurements have difficulty distinguishing between heavy oil and water in the formation. An acoustic signal is used to modify the relaxation time distribution of water and heavy oil in opposite directions and thus increase the separability of the distributions. | 08-12-2010 |
20100201359 | MWD/LWD NMR IMAGING WITH LONG ECHO TRAINS - An apparatus for estimating a property of an earth formation having: a plurality of receiver antennas to receive nuclear magnetic resonance (NMR) signals from a plurality of angular segments in a region of investigation in response to an interaction between a static magnetic field and pulses of electromagnetic energy; and a processor configured to: receive the NMR signals from each receiver antenna, the NMR signals having first NMR signals received from each angular segment by only one receiver antenna and second NMR signals received from a same angular segment by at least two receiver antennas; associate the first NMR signals and the second NMR signals with the angular segment from which the first NMR signals and the second NMR signals were obtained; deconvolve the second NMR signals to produce deconvolved NMR signals; and estimate the property from the first NMR signals, the deconvolved NMR signals, and the associated angular segments. | 08-12-2010 |
20100225313 | ATOMIC MAGNETOMETERS FOR USE IN THE OIL SERVICE INDUSTRY - An apparatus for obtaining information from a subterranean environment, the apparatus includes: an atomic magnetometer configured to measure a magnetic field related to the information. An associated method for obtaining the information is also disclosed. | 09-09-2010 |
20100237860 | CONTINUOUS WETTABILITY LOGGING BASED ON NMR MEASUREMENTS - A method for utilizing received formation data to determine one or more fluid instance such as reservoir wettability while in one of a subterranean environment or a surface environment. The method comprising: (a) obtaining at least one set of formation data wherein the set of formation data includes magnetic resonance data from two or more samples within an approximate common characteristic region in the reservoir; (b) computing from the at least one set of received formation data a first fluid instance of the one or more fluid instance using at least two mathematical variables from the group consisting of one of oil saturation, water saturation, T | 09-23-2010 |
20100259258 | ESTIMATING T2-DIFFUSION PROBABILITY DENSITY FUNCTIONS FROM NUCLEAR MAGNETIC RESONANCE DIFFUSION MODULATED AMPLITUDE MEASUREMENTS - In some embodiments, apparatus and systems, as well as methods, may operate to acquire data representing a plurality of nuclear magnetic resonance (NMR) echo trains associated with a material, such as a geological formation. Additional operations may include inverting a model of at least one of the plurality of NMR echo trains to provide an estimated distribution of transverse relaxation time constants, inverting models of selected ones of the plurality of NMR echo trains using the estimated distribution of transverse relaxation time constants to provide an estimated diffusion distribution, and inverting a model of selected ones of the plurality of NMR echo trains, using the estimated distributions of transverse relaxation time constants and diffusion, to provide an apparent and an intrinsic probability density function to identify fluid types in the material. | 10-14-2010 |
20100264914 | SYSTEM AND METHOD FOR ESTIMATING FORMATION CHARACTERISTICS IN A WELL - A technique utilizes the acquisition of data via nuclear magnetic resonance at multiple depths of investigation in a well region. The acquired data is processed to estimate variable fluid mixture densities at different radial depths. The variable fluid mixture densities and a radial response from a density tool, for example, can be used to calculate an effective fluid mixture density and used to interpret density logs. Other logs such as neutron log, induction resistivity log, and dielectric permittivity log can be combined with NMR. For these tools a corresponding effective formation property can be calculated and used to determine other formation characteristics, such as total porosity, total density, dielectric permittivity, electric resistivity, and formation characteristics derivable from these. | 10-21-2010 |
20100264915 | FORMATION TESTING AND EVALUATION USING LOCALIZED INJECTION - Evaluating a formation by lowering a downhole tool in a wellbore penetrating the formation, injecting a fluid into the formation at an injection zone via the downhole tool, and using a formation evaluation sensor to perform a measurement at each of a plurality of locations in the wellbore each proximate the injection zone. At least two of the plurality of measurements are compared, and a formation property is determined based on the comparison. | 10-21-2010 |
20100271019 | PREDICTING PROPERTIES OF LIVE OILS FROM NMR MEASUREMENTS - A fluid property of live crude oil removed from an earth formation is determined using nuclear magnetic resonance (NMR) measurements. A pressure cell, located on or near the earth's surface, and in which the live crude oil is disposed, is provided. An NMR tool capable of making NMR measurements on the live crude oil is provided, as is a database linking existing NMR data and the fluid property. A mapping function is created from a combination of radial basis functions and parameters of the mapping function are derived using the database. NMR data are acquired on the live crude oil using the NMR tool, and the fluid property is estimated from the acquired NMR data using the mapping function. | 10-28-2010 |
20100277165 | METHOD FOR DETERMINING WETTABILITY OF AN OIL RESERVOIR - A method for determining wettability of an earth formation zone surrounding a borehole, including the following steps: introducing paramagnetic ions into the water component of the zone; performing NMR measurements on the zone, and determining an NMR relaxation time parameter for the zone; extracting a fluid sample from the zone; performing NMR measurements on the sample, and determining the NMR relaxation time parameter for the sample; and determining wettability of the earth formation zone using the determined relaxation time parameter for the zone and the determined relaxation time parameter for the sample. | 11-04-2010 |
20100277166 | METHOD FOR DETERMINING FORMATION PARAMETER - A method of measuring a parameter characteristic of a rock formation in an oil well is provided for evaluating a reservoir treatment applied to a subterranean formation including the steps of injecting from a tool body suspended into a well at an injection location a known volume of fluid into the formation, performing a logging operation sensitive to a change of fluid content at several measuring points below and above the injection location; and using results of the logging operation to determine a depth profile along said well of a parameter related to fluid content. | 11-04-2010 |
20100277167 | Method and Apparatus for Determining Multiscale Similarity Between NMR Measurements and a Reference Well Log - Pulse sequences are applied to a fluid in an earth formation in a static magnetic field and NMR spin echo signals are obtained. The signals are processed to give a distribution of a relaxation time at a plurality of depths. Semblance between the distributions and a log of a formation property are used to identify depths at which portions of the distributions are similar to the formation property logs. | 11-04-2010 |
20100283459 | Method and Apparatus for NMR Measurements in Underbalanced Drilling - NMR spin echo signals are measured in a borehole during underbalanced drilling. A magnetic field gradient in the region of examination is selected to suppress an effect of a formation fluid flow on the produced signals, the fluid flow being caused by the excess of the formation pressure over the borehole fluid pressure. | 11-11-2010 |
20100283460 | Method and Apparatus for NMR Measurements in Small Boreholes - NMR spin echo signals are measured in a small borehole during drilling. Signals measured in a plurality of regions of investigation are combined to increase the signal strength. | 11-11-2010 |
20100283461 | Method and Apparatus for NMR Measurements While Drilling with Multiple Depths of Investigation - NMR spin echo signals are measured in a borehole during drilling. Signals measured in a plurality of regions of investigation with different depths of investigation in the borehole are processed to give a radial profile of formation properties, including a potential gas kick. | 11-11-2010 |
20100315081 | METHOD FOR DETERMINING FORMATION PARTICLE SIZE DISTRIBUTION USING WELL LOGGING MEASUREMENTS - A method for determining particle size distribution of a subsurface rock formation using measurements of at least one nuclear magnetic resonance property made from within a wellbore penetrating the rock formation includes determining a distribution of nuclear magnetic relaxation times from the measurements of the at least one nuclear magnetic resonance property. A surface relaxivity of the formation is determined from measurements of a formation parameter. The relaxation time distribution and surface relaxivity are used to determine the particle size distribution. | 12-16-2010 |
20110018535 | METHOD AND APPARATUS USABLE FOR MINING AND MINERAL EXPLORATION - A method for mineral analysis of a sample based on detection of NQR and/or NMR signals from a particular substance within a sample includes: setting a frequency of RF pulses to be approximately equal to one of the NQR or NMR frequencies of the substance; setting a set of parameters of the RF pulses to be optimal for the substance; setting a set of receiving parameters to be optimal for the substance; tuning the probe to maximum sensitivity for the signals detected at predetermined frequency and/or to maximum power transfer efficiency for RF pulses transmitted with the probe; transmitting the RF pulses with the probe at said optimal level during a transmitting period to irradiate the sample and excite an NQR or NMR signal in the substance, if present; detecting and processing NQR or NMR signals emitted by the substance; and calculating the concentration of the substance in the sample. | 01-27-2011 |
20110043202 | FLUID SATURATION ESTIMATION - In some embodiments, apparatus and systems, as well as methods, may operate to acquire signature data representing a plurality of nuclear magnetic resonance (NMR) echo trains associated with a material comprising a first fluid and a second fluid, force a subset of the signature data associated with the first fluid or the second fluid to correspond to single-peak signatures in the T | 02-24-2011 |
20110068787 | MEASUREMENTS IN NON-INVADED FORMATIONS - The present invention relates to making one or more measurements in a virgin formation using a downhole tool that includes a miniature logging tool. The downhole tool is disposed in a wellbore penetrating the formation, adjacent to the formation, and a sidetrack borehole is made into the formation. All or a portion of the miniature logging tool is deployed into the sidetrack borehole and measurements are made in the virgin formation using the miniature logging tool. The downhole tool may include a drilling/coring module, a pump module, and packers. The drilling/coring module is used to make the sidetrack borehole, and the packers and pump module can be used to create an underbalanced drilling condition in an isolated section of the wellbore. | 03-24-2011 |
20110068788 | ESTIMATING POROSITY AND FLUID VOLUME - The present disclosure relates to a method to estimate a subsurface formation property. A downhole logging tool is provided and disposed in a wellbore. Multiple measurements of various measurement types are obtained at various depths of investigation using the downhole logging tool. The multiple measurements may include natural gamma ray measurements, density measurements, resistivity measurements, nuclear measurements, and nuclear magnetic resonance measurements. The signal-to-noise ratio of the measured signals is increased using, for example, lateral stacking and multi-shell inversion. The subsurface formation property is estimated using the increased signal-to-noise ratio signals. The subsurface formation property may include porosity, adsorbed gas volume, free gas volume, bound water volume, free water volume, oil volume, and kerogen volume. A fluid analysis may be performed using a multi-dimensional nuclear magnetic resonance technique. Fluids such as water, oil, gas, and oil-based mud in the wellbore may be identified and/or evaluated. | 03-24-2011 |
20110095757 | Non-Destructive Determination of the Pore Size Distribution and The Distribution of Fluid Flow Velocities - A method is disclosed for the non-destructive determination of the pore size distribution and the distribution of fluid flow velocities using NMR spin echo signal measurements. In one embodiment, the invention involves simultaneously injecting acoustic energy ( | 04-28-2011 |
20110175607 | NMR LOGGING OF MISCIBLE DISPLACEMENT - NMR logging in a wellbore is used to monitor an oil reservoir during oil recovery by miscible displacement. Diffusivity distributions found by NMR logging indicate whether one or two phases are present and composition of residual oil. Operation of the oil recovery procedure may be maintained or modified in response to monitoring of the reservoir. | 07-21-2011 |
20110181277 | METHOD OF DETERMINING FORMATION PARAMETER - A nuclear magnetic resonance relaxation dispersion method to determine the wettability and other parameters of a fluid in a porous medium such as in an earth formation is provided. The method includes the steps of measuring the spin-lattice relaxation time T | 07-28-2011 |
20110181278 | NMR CONTRAST LOGGING - An apparatus for estimating a property of an earth formation penetrated by a borehole, the apparatus includes: a carrier configured to be conveyed through the borehole; a nuclear magnetic resonance (NMR) instrument disposed at the carrier and configured to perform an NMR measurement on a volume sensitive to the NMR measurement; and a contrast agent disposed in the volume and comprising particles that form a suspension in a liquid, the suspension of particles being configured increase a magnetic field gradient of at least one earth formation material in the volume to change an NMR relaxation time constant of the at least one earth formation material; wherein the NMR measurement on the volume containing the at least one earth formation material and the contrast agent is used to estimate the property. | 07-28-2011 |
20110215802 | MODIFIED PULSE SEQUENCE TO ESTIMATE PROPERTIES - Methods and related systems are described for estimating fluid or rock properties from NMR measurements. A modified pulse sequence is provided that can directly provide moments of relaxation-time or diffusion distributions. This pulse sequence can be adapted to the desired moment of relaxation-time or diffusion coefficient. The data from this pulse sequence provides direct estimates of fluid properties such as average chain length and viscosity of a hydrocarbon. In comparison to the uniformly-spaced pulse sequence, these pulse sequences are faster and have a lower error bar in computing the fluid properties. | 09-08-2011 |
20110227570 | DETERMINING THE LARMOR FREQUENCY FOR NMR TOOLS - The Larmor frequency for an in situ nuclear magnetic resonance (NMR) tool is determined and used to acquire NMR data. An NMR tool is provided and placed in situ, for example, in a wellbore. An initial estimate of the Larmor frequency for the in situ NMR tool is made and NMR data are acquired using the in situ NMR tool. A spectral analysis is performed on the NMR data, or optionally, the NMR data are digitized and a discrete Fourier transform (DFT) is performed on the digitized NMR data. The modal frequency of the spectral analysis or DFT is determined, and the Larmor frequency for the in situ NMR tool is determined using the modal frequency. The NMR tool is modified to transmit at the determined Larmor frequency and then used to acquire further NMR data. | 09-22-2011 |
20110234220 | SYSTEM AND METHOD FOR EMULATING NUCLEAR MAGNETIC RESONANCE WELL LOGGING TOOL DIFFUSION EDITING MEASUREMENTS ON A BENCH-TOP NUCLEAR MAGNETIC RESONANCE SPECTROMETER FOR LABORATORY-SCALE ROCK CORE ANALYSIS - A laboratory NMR methodology (and corresponding laboratory apparatus) defines a sample volume. The method stores downhole tool data corresponding to a hydrocarbon-bearing sample collected from a given subsurface formation. The downhole tool data includes parameters pertaining to magnetic fields used by a downhole tool during a suite of NMR measurements of the given subsurface formation. The sample is positioned in the sample volume of the laboratory apparatus, which applies a static magnetic field in the sample volume. Furthermore, the laboratory apparatus applies a suite of NMR measurements to the sample volume to thereby determine a property of the sample. The NMR measurements of the suite each include a pulse sequence of oscillating magnetic field in conjunction with a pulsed-mode gradient field. The pulsed-mode gradient field is based on the stored downhole tool data corresponding to the sample. A laboratory NMR methodology for optimizing downhole NMR measurements is also described. | 09-29-2011 |
20110241667 | MAGNETIC RESONANCE METHOD USING A PHASE-MODULATED PULSE TRAIN WITH A CONSTANT SMALL FLIP ANGLE - A method for performing magnetic resonance measurements on a sample includes applying a first predetermined number of pulse trains for excitation, each pulse train having a constant amplitude and including a second predetermined number of pulses spaced by a predetermined time interval. The pulse trains are modulated by a bent function. After each pulse, data is sampled. Preferably a square number of pulses is generated being constant in power, and the Walsh transform of the sequence of their phases is constant in power, so that the power of the excitation in time and frequency domain is constant. The method can reduce power requirements and may permit undercutting specific absorption rate (SAR) limits due to the small excitation power necessary to create time signals with reasonable signal to noise ratio. | 10-06-2011 |
20110298457 | DOWNHOLE ORIENTATION SENSING WITH NUCLEAR SPIN GYROSCOPE - Downhole orientation sensing with a nuclear spin gyroscope. A downhole orientation sensing system for use in conjunction with a subterranean well can include a downhole instrument assembly positioned in the well, the instrument assembly including an atomic comagnetometer, and at least one optical waveguide which transmits light between the atomic comagnetometer and a remote location. A method of sensing orientation of an instrument assembly in a subterranean well can include incorporating an atomic comagnetometer into the instrument assembly, and installing the instrument assembly in the well. | 12-08-2011 |
20120001629 | NON-RESONANT LOGGING TOOLS - Methods and systems are provided for tools having non-resonant circuits for analyzing a formation and/or a sample. For example, nuclear magnetic resonance and resistivity tools can make use of a non-resonant excitation coil and/or a detection coil. These coils can achieve desired frequencies by the use of switches, thereby removing the requirement of tuning circuits that are typical in conventional tools. | 01-05-2012 |
20120013335 | METHOD OF ADJUSTING PROPERTIES OF DRILLING FLUIDS AND APPARATUS FOR USE IN SUCH METHODS - The present invention provides a method of determining a physiochemical property of a drilling fluid at a drilling site during a drilling phase, said method comprising detecting a nuclear magnetic resonance signal from out-of-hole drilling fluid at said site and calculating therefrom a value indicative of said property. | 01-19-2012 |
20120025820 | METHODS AND SYSTEMS FOR APPLYING SPEED CORRECTION TO NMR ECHO DATA - A method and system for performing speed correction on nuclear magnetic resonance logging data is provided. The speed correction performed can be done on a representation of echo data received by a logging tool, and then additively applied to the echo data. Such a process can reduce or remove the amplification of noise in the echo data that is common in conventional methods of speed correction. | 02-02-2012 |
20120068700 | Formation Evaluation Capability From Near-Wellbore Logging Using Relative Permeability Modifiers - Nano-particles that possess either selective fluid phase blocks or modify the relative permeability of an earth formation to different fluids are used to inhibit the invasion of borehole mud into the formation. This makes it possible to make formation evaluation measurements using sensors with a shallow depth of investigation. | 03-22-2012 |
20120126809 | Nuclear Magnetic Resonance Tool With Movable Magnets - Methods and systems are provided that enable logging while drilling NMR measurements to be made with a tool having magnets with positions adjustable or movable relative to each other. Such movement can affect the depth of investigation of the NMR tool. A variety of moving assemblies can be used to effectuate the movement, which can be performed either at the surface or downhole. The tool also can include a magnetically permeable member to control the magnetic field gradient. | 05-24-2012 |
20120169334 | MICROCOIL NMR FOR DOWNHOLE MICROFLUIDICS PLATFORM - Methods and related apparatuses of a downhole micro nuclear magnetic resonance (NMR) device having a resonant tuning (LC) circuit for use in a formation for collecting NMR signals from a fluid in the formation while under downhole pressures and temperatures. The downhole micro NMR device includes: a micro tube for the flowing fluid to flow therethrough; at least one magnet disposed about the micro tube; and at least one micro RF coil structured and arranged approximate to the micro tube and tuned to a Larmor frequency corresponding to a applied magnetic field from the at least one magnet. | 07-05-2012 |
20120229135 | CONTINUOUS WETTABILITY LOGGING BASED ON NMR MEASUREMENTS - A method for utilizing received formation data to determine one or more fluid instance such as reservoir wettability while in one of a subterranean environment or a surface environment. The method comprising: (a) obtaining at least one set of formation data wherein the set of formation data includes magnetic resonance data from two or more samples within an approximate common characteristic region in the reservoir; (b) computing from the at least one set of received formation data a first fluid instance of the one or more fluid instance using at least two mathematical variables from the group consisting of one of oil saturation, water saturation, T | 09-13-2012 |
20120235677 | CORRECTION FOR GAIN VARIATION DUE TO FAST CHANGING NMR SENSOR GAIN - An apparatus for performing nuclear magnetic resonance (NMR) measurements of a material of interest includes an NMR tool and a processor. The NMR tool includes a transmitter antenna; a transmitter coupled to the transmitter antenna; and a receiver antenna configured to receive NMR signals in response to transmitted pulses of electromagnetic energy transmitted by the transmitter antenna. The NMR signals include at least a first signal and a second signal of a phase-alternated group of signals. The processor is configured to receive the NMR signals; receive a first system gain related to the first signal and a second system gain related to the second signal, each system gain being related to a system comprising the NMR tool and the material of interest; and calibrate the NMR signals using the first system gain and the second system gain. | 09-20-2012 |
20130002246 | MODIFIED PULSE SEQUENCE TO ESTIMATE PROPERTIES - Methods and related systems are described for estimating fluid or rock properties from NMR measurements. A modified pulse sequence is provided that can directly provide moments of relaxation-time or diffusion distributions. This pulse sequence can be adapted to the desired moment of relaxation-time or diffusion coefficient. The data from this pulse sequence provides direct estimates of fluid properties such as average chain length and viscosity of a hydrocarbon. In comparison to the uniformly-spaced pulse sequence, these pulse sequences are faster and have a lower error bar in computing the fluid properties. | 01-03-2013 |
20130057277 | Method for Determining Rock Formation Fluid Interaction Properties Using Nuclear Magnetic Resonance Well Logging Measurements - A method for determining surface relaxivity of a rock formation in a wellbore includes using measurements of nuclear magnetic resonance properties of the rock formation made from within a wellbore penetrating the rock formations includes determining nuclear magnetic relaxation properties from the measurements of the nuclear magnetic resonance properties. A diffusion property of the rock formation is determined from the measurements of the nuclear magnetic resonance properties. The surface relaxivity of the rock formation is determined from the relaxation properties and the diffusion property. The surface relaxivity and other nuclear magnetic resonance properties are used to infer wettability and/or fluid saturation of the rock formations. | 03-07-2013 |
20130063142 | Multiple Coils for NMR Well-logging Measurements - An NMR apparatus disposed in a wellbore and having an array of two or more NMR sensors located at substantially the same axial position on the NMR apparatus and having different directional sensitivities is used to acquire an NMR signal from at least two of the two or more NMR sensors. The NMR signals are combined to obtain borehole information. The borehole information may include an azimuthal image of the formation surrounding the borehole. The azimuthal image may be a formation porosity image, a formation bound fluid image, a T2 distribution image, a T2 log mean image, a formation permeability image, or a formation fluid viscosity image. If two or more pre-amplifiers and receiver circuitry are also provided, the NMR signals may be combined prior to passing through the pre-amplifiers and receiver circuitry to improve the signal to noise ratio of the total signal from the desired sample space. | 03-14-2013 |
20130093422 | Nuclear Magnetic Resonance Logging Tool Having an Array of Antennas - Various disclosed nuclear magnetic resonance (NMR) logging systems and methods employ an array of antennas to provide increased resolution without sacrificing signal-to-noise ratio. Certain method embodiments include: establishing a static magnetic field (B | 04-18-2013 |
20130106413 | System and Method for Measuring Borehole Geometry While Drilling | 05-02-2013 |
20130113479 | METHOD FOR CORRECTING NMR AND NUCLEAR LOGS IN FORMATE MUD FILTRATE INVADED FORMATONS - A method of calculating a porosity of a geological formation includes determining a bulk pore volume and a movable fluid pore volume in the geological formation in which drilling mud including a mud filtrate is introduced, calculating a porosity of the formation based on a bulk pore volume, and correcting the porosity based on the movable fluid volume in the geological formation. | 05-09-2013 |
20130113480 | MULTIPHYSICS NMR LOGGING TECHNIQUES FOR THE DETERMINATION OF IN SITU TOTAL GAS IN GAS RESERVOIRS - Methods for the determination of the Total Gas in Place (TGiP) in gas-bearing formations are provided. Aspects of the subject disclosure also relate to the determination of the TGiP from nuclear magnetic resonance (NMR) logs alone or in combination other well logs. | 05-09-2013 |
20130134971 | MEDIA DISPLACEMENT DEVICE AND METHOD OF IMPROVING TRANSFER OF ELECTROMAGNETIC ENERGY BETWEEN A TOOL AND AN EARTH FORMATION - A media displacement device has a body configured to be positioned radially outwards of a tool having an antenna for transmitting electromagnetic energy to or receiving electromagnetic energy from an earth formation. The body is made of materials causing less power loss to electromagnetic energy transmitted or received by the tool than the media the body is configured to displace. | 05-30-2013 |
20130154635 | INTEGRATED NMR TRANSCEIVER ARRAY - The present disclosure relates to an integrated nuclear magnetic resonance (NMR) transceiver array, the array including a plurality of integrated NMR transceiver circuits disposed on a single chip. At least one of the plurality of integrated NMR transceiver circuits includes a transmitter that receives and outputs a radio frequency (RF) pulse train and a receiver that receives an NMR signal. | 06-20-2013 |
20130162247 | REFOCUSING PULSES AND EXCITATION PULSES FOR NMR LOGGING - Illustrative embodiments are directed to applying a nuclear magnetic resonance sequence to a substance within an inhomogeneous static magnetic field. Various embodiments include applying a series of refocusing pulses to the substance, each refocusing pulse in the series of refocusing pulses having at least two segments, and a total pulse duration less than or equal to approximately 1.414 times T | 06-27-2013 |
20130181706 | SYSTEM AND METHOD TO ESTIMATE A PROPERTY OF A FLUID FLOW - An apparatus and method estimate a property of a fluid flow. The apparatus includes a nuclear magnetic resonance (NMR) tool performing an NMR measurement on the fluid in a sensitive volume. The apparatus also includes a processor receiving the NMR measurement from the NMR tool, determining a frequency or phase change of the spin echo signals from the NMR measurement, and estimating the property using the frequency or phase change. | 07-18-2013 |
20130181707 | SYSTEM AND METHOD TO DETECT A FLUID FLOW - An apparatus detects a fluid flow. The apparatus includes a nuclear magnetic resonance (NMR) tool configured to perform an NMR measurement on the fluid in a sensitive volume by establishing a magnetic field in the sensitive volume and transmitting a sequence of refocus pulses, without a tipping pulse, the NMR measurement comprising spin echo signals. The apparatus also includes a processor configured to detect a presence of the fluid flow in the sensitive volume based on the spin echo signals. | 07-18-2013 |
20130187647 | NMR LOGGING APPARATUS - Technologies including NMR logging apparatus and methods are disclosed. Example NMR logging apparatus may include surface instrumentation and one or more downhole probes configured to fit within an earth borehole. The surface instrumentation may comprise a power amplifier, which may be coupled to the downhole probes via one or more transmission lines, and a controller configured to cause the power amplifier to generate a NMR activating pulse or sequence of pulses. Impedance matching means may be configured to match an output impedance of the power amplifier through a transmission line to a load impedance of a downhole probe. Methods may include deploying the various elements of disclosed NMR logging apparatus and using the apparatus to perform NMR measurements. | 07-25-2013 |
20130187648 | ESTIMATING AND DISPLAYING MOLECULAR SIZE INFORMATION OF A SUBSTANCE - Estimating and displaying information about the size of molecules within a substance from nuclear magnetic resonance (NMR) maps and/or logs. Methods include utilizing a relationship between the molecular size (e.g., mean chain length), and either a moment of diffusion or a relaxation distribution, to create a scale on a two-dimensional map. In one case, applying the relationship between the molecular size, and either a moment of diffusion or a relaxation distribution, to one-dimensional diffusion or relaxation distributions for the purpose of estimating the mean chain length of molecules within the substance. In another case, a method includes determining mean chain lengths of molecules within a substance and providing a one-dimensional NMR log showing the mean chain lengths at a plurality of depths. In some cases, the NMR log includes actuatable regions for examining two-dimensional NMR maps or chain length distributions of the substance corresponding with distinct depths of the substance. | 07-25-2013 |
20130193964 | METHOD FOR DETECTING OIL AND GAS FROM THE SURFACE BY NUCLEAR MAGNETIC RESONANCE IMAGING - A process using Nuclear Magnetic Resonance (NMR) with pre-determined oil specimens at the earth's surface by which to match the location and lateral boundaries of any and every producible oil reservoir responsive to NMR technology, to provide estimates to useable industry standards of porosity and permeability of said reservoirs for exploration purposes by NMR, to detect and identify depth and direction of faults in any given oil area by NMR, to provide mapping of surveyed areas prior to drilling either offset or wildcat ventures resulting from NMR testing, to evaluate reservoir and production potential in existing oil fields by NMR, to detect the existence of natural gas by NMR, and the ability to condemn any proposed drilling location in view of failure. | 08-01-2013 |
20130200890 | KEROGEN POROSITY VOLUME AND PORE SIZE DISTRIBUTION USING NMR - Method and apparatus for estimating a kerogen (organic) porosity of an earth formation. The method may include using at least one processor to estimate a kerogen porosity using NMR signals indicative to an inorganic porosity and NMR signals indicative of a total porosity for a volume of interest in an earth formation. The apparatus may include an NMR tool configured to acquire NMR signals indicative to an inorganic porosity and NMR signals indicative of a total porosity for a volume of interest in an earth formation. | 08-08-2013 |
20130200891 | NMR DATA ACCURACY AND RESOLUTION BY FORMATION MODELING - Method and apparatus for estimating a parameter of interest of an earth formation using a model based on NMR data, imaging data, and NMR tool response characteristics. The method may include constructing a model of the earth formation. The method may also include constructing a predictive model for estimating the parameter of interest. The apparatus may include an NMR tool and at least one processor configured to estimate the parameter of interest. The apparatus may also include an imaging tool configured to acquire the imaging data. | 08-08-2013 |
20130214779 | METHOD AND SYSTEM TO CHARACTERIZE A PROPERTY OF AN EARTH FORMATION - A system and method of characterizing a property of an earth formation penetrated by a borehole are described. The method includes conveying a carrier through the borehole. The method also includes performing an NMR measurement with an NMR tool disposed at the carrier and obtaining NMR data, compressing the NMR data to generate compressed NMR data, and telemetering the compressed NMR data to a surface processor for processing. The method further includes decompressing the compressed NMR data directly to T | 08-22-2013 |
20130234703 | HYDROCARBON DETERMINATION IN UNCONVENTIONAL SHALE - An apparatus is disclosed for identifying a fluid and locations of the fluid in a formation of shale having porous kerogen material and an inorganic matrix defining pores and micro-fractures. The apparatus includes: a carrier configured to be conveyed through a borehole penetrating the shale; a nuclear magnetic resonance (NMR) tool disposed at the carrier and configured to perform NMR measurements on the shale, the NMR measurements include a spectrum of transverse relaxation times; and a processor configured to receive NMR measurements on the shale performed by the NMR tool and to identify the fluid and locations of the fluid in the shale using the spectrum of transverse relaxation times. | 09-12-2013 |
20130234704 | METHOD AND SYSTEM FOR APPLYING NMR PULSE SEQUENCES WITH INTERACTING SHELLS - A method and system for determining a nuclear magnetic resonance (NMR) property are described herein. The method includes applying a static magnetic field to a substance and applying an NMR pulse sequence to the substance. The NMR pulse sequence comprises a first pulse sequence segment applied at a first frequency to a shell and a second pulse sequence segment applied at a second frequency. The first pulse sequence segment generates a resonant signal in the shell and the second pulse sequence segment generates a characteristic within the resonant signal. The resonant signal is detected and an NMR property is determined using the characteristic within the detected resonant signal. | 09-12-2013 |
20130234705 | METHOD AND SYSTEM FOR APPLYING NMR PULSE SEQUENCES USING DIFFERENT FREQUENCIES - A method and system for applying nuclear magnetic resonance (NMR) sequences to a substance are described herein. The method includes applying an NMR pulse sequence to the substance using a non-resonant transmitter circuit. The NMR pulse sequence includes a first pulse sequence segment applied at a first frequency to a first shell within the substance and a second pulse sequence segment applied at a second frequency to a second shell. The second pulse sequence segment is initiated before the first shell reaches thermal equilibrium. In some cases, the first pulse sequence segment and the second pulse sequence segment are interposed within each other. Such NMR pulse sequences, with multiple pulse sequence segments, can also be applied to different atomic nuclei. | 09-12-2013 |
20130234706 | SYSTEM AND METHOD FOR PROCESSING MAGNETIC RESONANCE SIGNALS - A broadband magnetic resonance (MR) receiver is described herein. The MR receiver can be used to process nuclear magnetic resonance (NMR) signals. The MR receiver includes a transformer that amplifies the MR signals and a preamplifier that receives the MR signals from the transformer. The preamplifier includes a common-drain amplifier stage and a common-source amplifier stage. | 09-12-2013 |
20130257424 | MAGNETIC RESONANCE ROCK ANALYSIS - Processing is described for magnetic resonance measurements of granular material in the reciprocal Fourier domain to determine grain size distribution and/or pore size distribution in the granular material. In some examples, the granular material is a rock from subterranean reservoir containing water, oil, gas or a combination thereof. The processing of the magnetic resonance data can include a Bayesian analysis and can be used to provide information on length scales below the resolution obtained practicably in conventional magnetic resonance imaging experiments. | 10-03-2013 |
20130265043 | T2CUTOFF DETERMINATION USING MAGNETIC SUSCEPTIBILITY MEASUREMENTS - Systems and methods for determining T2 cutoff are described. T2 cutoff can be derived from magnetic susceptibility measurements. By providing a depth curve of T2cutoff, improved permeability estimations from NMR can be generated. By combining a magnetic susceptibility tool and an NMR tool, a dynamic T2cutoff can then be provided, together with the standard NMR log, according to some embodiments. According to some embodiments the improved permeability estimations can be provided automatically and in real time at the wellsite. | 10-10-2013 |
20130271127 | Distinguishing Mud Filtrate From Formation Water By Multi-DOI NMR - A nuclear magnetic resonance (NMR) measurement, at two or more depths of investigation, of a subsurface formation containing formation water and a mud filtrate from a water-base mud is obtained, and the mud filtrate is distinguished from the formation water. A NMR logging tool is disposed in a wellbore penetrating the formation containing the mud filtrate and the formation water and NMR measurements at different radial depths of investigation into the formation are made. The mud filtrate is distinguished from the formation water by determining the relative salinities of the mud filtrate and the formation water. The relative salinities are determined by comparing distribution relaxation times across different depths of investigation or by comparing logarithmic mean values across different depths of investigation. | 10-17-2013 |
20130285652 | METHOD AND APPARATUS USABLE FOR MINING AND MINERAL EXPLORATION - A method for mineral analysis of a sample based on detection of NQR and/or Local Field Magnetic Resonance (LFMR) signals from a particular substance within a sample includes: setting a frequency of RF pulses to be approximately equal to one of the NQR or LFMR frequencies of the substance; setting a set of parameters of the RF pulses to be optimal for the substance; setting a set of receiving parameters to be optimal for the substance; tuning the probe to maximum sensitivity for the signals detected at predetermined frequency and/or to maximum power transfer efficiency for RF pulses transmitted with the probe; transmitting the RF pulses with the probe at said optimal level during a transmitting period to irradiate the sample and excite an NQR or LFMR signal in the substance, if present; detecting and processing NQR or LFMR signals emitted by the substance; and calculating the concentration of the substance in the sample. | 10-31-2013 |
20130293228 | NMR DETECTION OF WATER AND HYDROCARBONS DURING INDUCED ALTERATION PROCESSES - Technologies applicable to NMR detection of water and hydrocarbons during induced alteration: processes are disclosed. NMR measurements may be used to monitor properties of subsurface fluids within a subsurface formation. NMR measurement devices may be deployed proximal to or within a subsurface formation that contains hydrocarbons. Multiple NMR measurements may be performed during an induced alteration process applied, to the subsurface formation to determine properties of the subsurface formation or fluid as the induced alteration process progresses. Changes in properties of the subsurface formation or fluid may be determined and may be used to determine efficacy of optimize, or otherwise modify the induced alteration process. | 11-07-2013 |
20140035574 | SYSTEM AND METHOD FOR ESTIMATING A NUCLEAR MAGNETIC RESONANCE RELAXATION TIME CUTOFF - A nuclear magnetic resonance relaxation time cutoff between results for a bound-water index of rock and a free-fluid index of the rock is determined. The determination is made based on measured and predicted values for permeability and/or wettability over a set of core plugs. The determination does not require a nuclear magnetic resonance operation performed on the core plugs under irreducible water saturation. | 02-06-2014 |
20140084915 | NMR LOGGING APPARATUS - Technologies including NMR logging apparatus and methods are disclosed. Example NMR logging apparatus may include surface instrumentation and one or more downhole probes configured to fit within an earth borehole. The surface instrumentation may comprise a power amplifier, which may be coupled to the downhole probes via one or more transmission lines, and a controller configured to cause the power amplifier to generate a NMR activating pulse or sequence of pulses. Impedance matching means may be configured to match an output impedance of the power amplifier through a transmission line to a load impedance of a downhole probe. Methods may include deploying the various elements of disclosed NMR logging apparatus and using the apparatus to perform NMR measurements. | 03-27-2014 |
20140117984 | ROTATIONAL INDEXING TO OPTIMIZE SENSING VOLUME OF A NUCLEAR MAGNETIC RESONANCE LOGGING TOOL - A nuclear magnetic resonance (NMR) logging tool assembly method that employs rotational indexing to optimize the sensing volume. At least some embodiments include establishing an initial arrangement of the permanent magnets and marking each magnet to indicate their relative rotational orientations in the initial arrangement. Thereafter a series of magnetic field measurements and individual magnet rotations are performed to improve uniformity of the magnetic field in the sensing volume. Once a satisfactory arrangement has been found, the magnets may be secured together and an antenna array installed along with the electronics for performing relaxation time measurements and providing logs of formation properties that can be derived therefrom, such as porosity, permeability, density, rock type, fluid type, etc. The tool may be packaged as a wireline sonde, a tubing-conveyed logging tool, or a logging while drilling (LWD) tool. | 05-01-2014 |
20140132258 | ASPHALTENE EVALUATION BASED ON NMR MEASUREMENTS AND TEMPERATURE / PRESSURE CYCLING - Asphaltene content and its spatial distribution in a reservoir containing crude oil is an important factor in determining the potential for formation damage and pipeline impairment, as well as planning for processing and refining of the oil. Exemplary uses include: reservoir modeling, development and depletion planning, pressure maintenance, and surface facilities management. A convenient method has been developed which uses two-dimensional NMR techniques during a temperature and/or pressure cycle to quantify the asphaltene content of the crude oil without the need for extracting the oil from the reservoir rock. The technique can be applied to core, down-hole logs, or, a combination of both. | 05-15-2014 |
20140132259 | NMR METHOD TO DETERMINE GRAIN SIZE DISTRIBUTION IN MIXED SATURATION - A method for determining particle size distribution of a subsurface rock formation having pore spaced filled with at least two different fluids using measurements of at least one nuclear magnetic resonance property thereof made from within a wellbore penetrating the rock formation includes determining a distribution of nuclear magnetic relaxation times from the measurements of the at least one nuclear magnetic resonance property. A fractional volume of the pore spaces occupied by each of the at least two fluids is determined. A surface relaxivity of the rock formation for portions of the rock pore spaces occupied by each of the at least two fluids is determined from a measurement of a formation parameter. The relaxation time distribution and the surface relaxivities are used to determine the particle size distribution. | 05-15-2014 |
20140145716 | NMR TRACKING OF INJECTED FLUIDS - Formation testing systems and methods may inject fluids into a formation to initiate fractures and facilitate measurements of various formation properties. In accordance with certain disclosed embodiments, the injection tools are further provided with nuclear magnetic resonance (NMR) sensors to monitor the injected fluids and provide measurements of near-borehole fracture orientations and volumes. Contrast agents and/or magnetic resonance imaging (MRI) techniques may be employed. The fluid injecion may occur via an extendible isolation pad, via a fracturing jet, or via an injection port in an isolated region of the borehole. The systems may employ pressure monitoring in conjunction with the NMR sensors to further enhance estimates of formation and fracture properties. | 05-29-2014 |
20140152301 | Determining the Larmor Frequency for NMR Tools - The Larmor frequency for an in situ nuclear magnetic resonance (NMR) tool is determined and used to acquire NMR data. An NMR tool is provided and placed in situ, for example, in a wellbore. An initial estimate of the Larmor frequency for the in situ NMR tool is made and NMR data are acquired using the in situ NMR tool. A spectral analysis is performed on the NMR data, or optionally, the NMR data are digitized and a discrete Fourier transform (DFT) is performed on the digitized NMR data. The modal frequency of the spectral analysis or DFT is determined, and the Larmor frequency for the in situ NMR tool is determined using the modal frequency. The NMR tool is modified to transmit at the determined Larmor frequency and then used to acquire further NMR data. | 06-05-2014 |
20140232391 | ROTATING FRAME PULSED NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY - An NMR method and apparatus for analyzing a sample of interest applies a static magnetic field together with RF pulses of oscillating magnetic field across a sample volume that encompasses the sample of interest. The RF pulses are defined by a pulse sequence that includes a plurality of measurement segments configured to characterize a plurality of relaxation parameters related to relaxation of nuclear magnetization of the sample of interest. Signals induced by the RF pulses are detected in order to derive the relaxation parameters. The measurement segments of the pulse sequence include at least one first-type measurement segment configured to characterize relaxation of spin-lattice interaction between nuclei of the sample of interest in a rotating frame (T | 08-21-2014 |
20140253116 | SYSTEM AND METHOD FOR OBTAINING NUCLEAR MAGNETIC RESONANCE MEASUREMENTS ON RESERVOIR FLUIDS FOR PREDICTION OF FLUID PROPERTIES - A nuclear magnetic resonance (NMR) measurement system for high pressure and temperature measurements on fluids is disclosed. The system has a sensor assembly that includes a sample holder having a body formed from a non-magnetic metal and defining an interior cavity for receiving a fluid sample, a frame member disposed in the interior cavity of the sample holder, an antenna coil disposed in the interior cavity about the frame member, an inlet that allows the fluid sample to enter the interior cavity, an outlet that allows for the fluid sample to be flushed from the interior cavity, and a magnet assembly having a central bore in which the sample holder is disposed. Adjacent to the sample holder are pulsed field gradient coils for performing diffusion measurements. The system further includes pulse sequencer circuitry that supplies signals to the antenna coil. When the interior cavity of the sample holder is filled with the fluid sample, the antenna coil and the frame member are at least partially submerged in the fluid sample, and the antenna coil obtains NMR measurements of the fluid sample in response to the signals. Related methods and apparatuses are also disclosed herein. | 09-11-2014 |
20140285190 | Petrophysically Regularized Time Domain NMR Inversion - A petrophysically regularized time domain nuclear magnetic resonance (NMR) inversion includes using an NMR tool to acquire NMR data and inverting the acquired NMR data in a time domain using petrophysical constraints. The inverted NMR data is analyzed. The petrophysical constraints may be identified by: determining a number of porobodons to seek, defining a plurality of zones in which only a subset of porobodon sets is present, and stacking all NMR echoes in each zone satisfying discriminators. The number of porobodons to seek may be based on knowledge of core samples, logs, and NMR sensitivity. The discriminator logs may be logs sensitive to porosity partitioning. A computing system having a processor, a memory, and a program stored in memory may be configured to perform the method. The system may be conveyed downhole on a wireline, a while-drilling drill string, a coiled tubing, a slickline, or a wired drill pipe. | 09-25-2014 |
20140320126 | Statistical Analysis of Combined Log Data - A method for determining at least one characteristic of a geological formation having a borehole therein may include collecting nuclear magnetic resonance (NMR) data of the geological formation adjacent the borehole, and collecting non-NMR data for the geological formation adjacent the wellbore. The method may further include performing a Monte Carlo analysis based upon a combination of the collected NMR and non-NMR data to determine the at least one characteristic of the geological formation having a bounded uncertainty therewith. | 10-30-2014 |
20150015250 | In-situ Characterization Of Formation Constituents - A well-logging method for a geological formation having a borehole therein may include collecting a plurality of nuclear magnetic resonance (NMR) snapshots from the borehole indicative of changes in the geological formation and defining NMR data. The method may further include identifying a plurality of fluids within the geological formation based upon the NMR data, determining respective NMR signatures for the identified fluids based upon the NMR data, determining apparent volumes for the identified fluids based upon the NMR signatures, and determining adjusted volumes for the identified fluids based upon the apparent volumes. | 01-15-2015 |
20150035529 | Nuclear Magnetic Resonance Tool With External Magnets - Methods and systems are provided that enable logging while drilling NMR measurements to be made with magnets placed outside of the drill collar and magnetically permeable members to control the magnetic field gradient. A set of magnets can be disposed on and/or embedded on a drill collar, with an antenna disposed axially therebetween. Alternatively, a set of magnets and an antenna disposed therebetween can be disposed on a sleeve that is slid onto a recess in a drill collar. Additionally, a permeable member can be axially positioned between the set of magnets for affecting the depth of investigation. | 02-05-2015 |
20150054503 | NUCLEAR MAGNETIC RESONANCE LOGGING TOOL HAVING MULTIPLE PAD-MOUNTED ATOMIC MAGNETOMETERS - Various disclosed nuclear magnetic resonance (NMR) logging systems and methods employ a plurality of NMR sensors, including atomic magnetometers, mounted on pads. Certain method embodiments include: utilizing the Earth magnetic field to pre-polarize the protons in a formation; utilizing a plurality of atomic magnetometers to obtain NMR measurements; and determining at least one characteristic relaxation time of the formation. The NMR sensor may optionally include a permanent magnet assembly. | 02-26-2015 |
20150061664 | Downhole Nuclear Magnetic Resonance (NMR) Tool with Transversal-Dipole Antenna Configuration - In some aspects, a downhole nuclear magnetic resonance (NMR) tool includes a magnet assembly and an antenna assembly. The NMR tool can operate in a wellbore in a subterranean region to obtain NMR data from the subterranean region. The magnet assembly produces a magnetic field in a volume about the wellbore. The magnet assembly includes a central magnet, a first end piece magnet spaced apart from a first axial end of the central magnet, and a second end piece magnet spaced apart from a second axial end of the central magnet. The antenna assembly includes a transversal-dipole antenna. In some cases, orthogonal transversal-dipole antennas produce circular-polarized excitation in the volume about the wellbore, and acquire a response from the volume by quadrature coil detection. | 03-05-2015 |
20150061665 | Azimuthally-Selective Downhole Nuclear Magnetic Resonance (NMR) Tool - In some aspects, a downhole nuclear magnetic resonance (NMR) tool includes a magnet assembly and an antenna assembly. The NMR tool can operate in a wellbore in a subterranean region to obtain NMR data from the subterranean region. The magnet assembly produces a magnetic field in a volume about the wellbore. The antenna assembly produces excitation in the volume and acquires an azimuthally-selective response from the volume based on the excitation. The antenna assembly can include a transversal-dipole antenna and a monopole antenna. | 03-05-2015 |
20150077102 | METHOD AND SYSTEM FOR APPLYING NQR PULSE SEQUENCES - A method and system for applying nuclear quadrupole resonance (NQR) sequences to a substance and determining presence of a chemical species within the substance using the sequences are described herein. The method includes applying an NQR pulse sequence to the substance using a non-resonant transmitter circuit. The method further includes detecting a NQR signal within the substance and determining presence of a chemical species within the substance using the NQR signal. | 03-19-2015 |
20150077103 | SYSTEM AND METHOD TO DETECT A FLUID FLOW WITHOUT A TIPPING PULSE - An apparatus and method to detect a fluid flow. The apparatus includes a nuclear magnetic resonance (NMR) tool to perform an NMR measurement on the fluid in a sensitive volume by establishing a magnetic field in the sensitive volume that exhibits a change in magnitude in a direction of the fluid flow when the fluid flow is radial with respect to the NMR tool and by transmitting refocus pulses, without any tipping pulse, to obtain the NMR measurement comprising spin echo signals. The system also includes a processor to receive the NMR measurement from the NMR tool and determine whether the fluid flow exists based on an amplitude of the NMR measurement. | 03-19-2015 |
20150115953 | METHOD AND APPARATUS FOR DETERMINING MUD CONTAMINATION OF FORMATION FLUID - A formation fluid sample is analyzed using NMR spectroscopy to obtain a NMR spectrum. The NMR spectrum is then analyzed to find evidence of the amount of olefins present in the sample. The amount of olefins present in the sample can then be correlated to the level of contamination of the sample. In one embodiment, a | 04-30-2015 |
20150115954 | NON-RESONANT MAGNETIC RESONANCE TRANSMITTER WITH POWER FACTOR CORRECTION - A non-resonant transmitter for a magnetic resonance (MR) system, such as a nuclear magnetic resonance (NMR) system, is described herein. The transmitter includes a coil for applying NMR pulse sequences to a substance. The coil is coupled to a circuit that includes a capacitor, a number of switches, and a power source. The transmitter operates in two modes. In a charging mode, the switches decouple the coil from the capacitor and the capacitor is charged by the power source. In a discharging mode, a radio frequency pulse is generated and the switches couple and decouple the coil from the capacitor so that the capacitor provides power to the coil. The addition of the capacitor improves the power factor of the circuit and reduces power draw from the power source. | 04-30-2015 |
20150145512 | Downhole Differentiation of Light Oil and Oil-Based Filtrates by NMR with Oleophilic Nanoparticles - Downhole nuclear magnetic resonance (NMR) methods that utilize oleophilic nanoparticle may allow for differentiation of light oil and oil-based filtrates. For example, a method may involve drilling a wellbore penetrating a subterranean formation using an oil-based drilling fluid that comprises an oil base fluid and a plurality of oleophilic nanoparticles; performing a plurality of NMR measurements at a plurality of depths of investigation (DOI) of a near-wellbore portion of the subterranean formation; and producing an invasion profile of an oil-based drilling fluid filtrate into the near-wellbore portion of the subterranean formation based on the plurality of NMR measurements. | 05-28-2015 |
20150145513 | HYBRID SATURATION RECOVERY-INVERSION RECOVERY PULSE SEQUENCE FOR IMPROVED NMR LOGGING OF BOREHOLES - A nuclear magnetic resonance (NMR) logging method includes providing a hybrid pulse sequence having a saturation pulse, an inversion pulse, and a detection sequence. The method also includes measuring echo signals in response to the hybrid pulse sequence. The method also includes deriving a spin-lattice time constant (T | 05-28-2015 |
20150293195 | NUCLEAR MAGNETIC RESONANCE T2 RECOVERY PULSE - Various embodiments include apparatus and methods to conduct measurements on a structure using a nuclear magnetic resonance tool. The nuclear magnetic resonance tool can be operated to make nuclear magnetic resonance measurements that generate transverse 5 relaxation time echo train sequences ending with a recovery pulse. Additional apparatus, systems, and methods are disclosed. | 10-15-2015 |
20150323698 | NUCLEAR MAGNETIC RESONANCE REFOCUSING PULSES FOR INHOMOGENEOUS MAGNETIC FIELDS - A method for applying a nuclear magnetic resonance (NMR) sequence is described herein. The method includes applying a series of refocusing pulses to a substance within an inhomogeneous static magnetic field. Each refocusing pulse in the series of refocusing pulses includes a central axis, a total pulse duration greater than t | 11-12-2015 |
20150346377 | WETTABILITY ESTIMATION USING MAGNETIC RESONANCE - A method of estimating a wettability characteristic of a formation includes: disposing a magnetic resonance (MR) measurement apparatus in a borehole; generating a low gradient static magnetic field and an oscillating magnetic field in a region of the formation; detecting a MR signal generated in the region; calculating relaxation parameters for at least one fluid in the region; and estimating the wettability characteristic of the region based on the relaxation parameters. | 12-03-2015 |
20160011328 | DEVICE AND METHOD FOR PARALLEL MICROFLUIDIC PRESSURE-VOLUME-TEMPERATURE ANALYSIS | 01-14-2016 |
20160018555 | DATA PROCESSING WITH MAGNETIC RESONANCE TOOL - Various embodiments include apparatus and methods to acquire echo signals associated with operation of a nuclear magnetic resonance logging tool to evaluate a formation and process the echo signals taking into account motion of the nuclear magnetic resonance logging tool. Coefficients may 5 be generated that are correlated to porosity of the formation. Additional apparatus, systems, and methods are disclosed. | 01-21-2016 |
20160033670 | Switching an Operating Mode of an NMR Logging Tool - In some aspects of what is described here, a downhole nuclear magnetic resonance (NMR) logging tool can obtain NMR data from a subterranean region. The NMR logging tool includes a magnet assembly operable to produce a static magnetic field in the subterranean region. The NMR logging tool includes an antenna system having a first radio-frequency (RF) antenna, a second RF antenna, and a switching system. The switching system can switch the second antenna among operating modes while the NMR logging tool is disposed in a borehole in the subterranean region. The operating modes can include a booster mode, a spoiler mode, and an inactive mode. | 02-04-2016 |
20160047936 | SYSTEMS AND METHODS FOR FORMATION EVALUATION USING MAGNETIC RESONANCE LOGGING MEASUREMENTS - A method for obtaining formation measurements. The method includes deriving a pulse sequence and magnetizing a formation by applying a static magnetic field, via a nuclear magnetic resonance (NMR) system, to the formation. The method further includes applying the pulse sequence by: a) measuring a first spin echo train after waiting a first time period; b) measuring at least two spin echo trains subsequent to the first spin echo train, where the at least two spin echo trains include a wait time shorter than the first time period; and c) repeating b at least two times. The method additionally includes determining a T1 and a T2 based on inversions of the measuring the first spin echo train, the measuring the at least two spin echo trains, or a combination thereof, to determine a formation measurement. | 02-18-2016 |
20160109612 | Methods And Apparatuses to Remove A Net Detected Residual Magnetization In A Nuclear Magnetic Resonance (NMR) Operation - In one aspect, a nuclear magnetic resonance (NMR) system includes a transmitter to output a main refocusing pulse sequence and at least one subsequent refocusing pulse sequence into a zone of interest, a randomizing pulse module to output a randomizing pulse into the zone of interest to remove a net detected residual magnetization, and a receiver to output an NMR data set from the zone of interest. In another aspect, a method of generating a nuclear magnetic resonance (NMR) data set includes outputting a main refocusing pulse sequence and at least one subsequent refocusing pulse sequence into a zone of interest, outputting a randomizing pulse from a randomizing pulse module into the zone of interest to remove a net detected residual magnetization, and sensing the NMR data set from the zone of interest. | 04-21-2016 |
20160109613 | Methods And Apparatuses For Echo Processing Of Nuclear Magnetic Resonance (NMR) Data - In one aspect, a nuclear magnetic resonance (NMR) system includes a transmitter of an NMR tool to output a magnetic field pulse into a zone of interest, a receiver of the NMR tool to output an NMR echo data set produced from an interaction of the magnetic field pulse and the zone of interest, and an NMR echo processing module including a filter matched to a response of the NMR tool to output a filtered NMR echo data set from the NMR echo data set. In another aspect, a method of processing an NMR echo data set includes providing from an NMR tool the NMR echo data set produced from an interaction of a magnetic field pulse and a zone of interest, matching a filter to a response of the NMR tool, and filtering the NMR echo data set with the filter to produce a filtered NMR echo data set. | 04-21-2016 |
20160116629 | FORMATION EVALUATION UTILIZING DUAL WAIT TIME NUCLEAR MAGNETIC RESONANCE - A system for measuring a property of fluid in an earth formation includes a downhole tool disposed in a borehole and configured to be movable within the borehole and a nuclear magnetic resonance (NMR) measurement device including a transmitter configured to emit at least two pulse trains of magnetic energy into the earth formation and a detector configured to detect a long-TW echo train and a short-TW echo train resulting from the at least two pulse trains. The system also includes a processor configured to combine the information from the at least two pulse trains and a rate of penetration of the downhole tool to form a measurement of the property. | 04-28-2016 |
20160124109 | Semi-Analytic Inversion Method For Nuclear Magnetic Resonance (NMR) Signal Processing - The present disclosure provides a semi-analytic inversion method that computes an approximate, sparse representation of the data in terms of the (a, T | 05-05-2016 |
20160139066 | METHODS AND SYSTEMS FOR DETERMINING SURFACE RELAXIVITY OF A MEDIUM USING NUCLEAR MAGNETIC RESONANCE - Methods and systems for determining surface relaxivity from nuclear magnetic resonance measurements relate to applying multiple nuclear magnetic resonance (NMR) diffusion editing Carr-Purcell-Meiboom-Gill (CPMG) pulse sequences to the porous medium, wherein the diffusion editing CPMG pulse sequences have a diffusion encoding time Δ; receiving NMR data generated by the pulse sequences; processing the received NMR data to obtain a distribution f(T | 05-19-2016 |
20160139291 | Surface Relaxivity Calculation using Nuclear Magnetic Resonance (NMR) Measurement, Three Dimensional (3D) Rock Model and NMR Response Simulation - The present invention is directed to a method to use nuclear magnetic resonance (“NMR”) to determine the surface relaxivity in a reservoir. The surface relaxivity can be used to calculate the pore size distribution in a reservoir. | 05-19-2016 |
20160161629 | Monitoring Carbon Dioxide Flooding Using Nuclear Magnetic Resonance (NMR) Measurements - A NMR logging tool is provided and disposed at some desired depth in a wellbore penetrating a subsurface formation. A first set of NMR measurements is made over a desired depth range and depth of investigation, wherein the first set of NMR measurements includes a first NMR signal intensity. Supercritical carbon dioxide is injected into the formation and a second set of NMR measurements is made over the desired depth range and depth of investigation, wherein the second set of NMR measurements includes a second NMR signal intensity. The first NMR signal intensity is compared to the second NMR signal intensity and one or more properties of the formation are inferred using the compared NMR measurements. A magnetic field gradient that varies a static magnetic field along a desired spatial dimension of a region of investigation may be provided to map a rate of fluid movement. | 06-09-2016 |
20160161630 | Monitoring Carbon Dioxide Flooding Using Nuclear Magnetic Resonance (NMR) Measurements - A NMR logging tool is provided and disposed at some desired depth in a wellbore penetrating a subsurface formation. A first set of NMR measurements is made over a desired depth range and depth of investigation, wherein the first set of NMR measurements includes a first NMR signal intensity. Supercritical carbon dioxide is injected into the formation and a second set of NMR measurements is made over the desired depth range and depth of investigation, wherein the second set of NMR measurements includes a second NMR signal intensity. The first NMR signal intensity is compared to the second NMR signal intensity and one or more properties of the formation are inferred using the compared NMR measurements. A magnetic field gradient that varies a static magnetic field along a desired spatial dimension of a region of investigation may be provided to map a rate of fluid movement. | 06-09-2016 |
20160169820 | METHODS FOR QUANTITATIVE CHARACTERIZATION OF ASPHALTENES IN SOLUTIONS USING TWO-DIMENSIONAL LOW-FIELD NMR MEASUREMENT | 06-16-2016 |
20160170065 | Methods to Characterize Formation Properties | 06-16-2016 |
20160170066 | Probability Distribution Based Logging Tool Data Compression | 06-16-2016 |
20160170067 | Logging Tool Providing Measured Response Database Comparison | 06-16-2016 |
20160170070 | FRONT TANGENTIAL ANTENNA FOR NUCLEAR MAGNETIC RESONANCE (NMR) WELL LOGGING | 06-16-2016 |
20160170071 | NUCLEAR MAGNETIC RESONANCE (NMR) LOGGING TOOL CALIBRATION | 06-16-2016 |
20160178786 | FORMATION PROPERTIES FROM TIME-DEPENDENT NUCLEAR MAGNETIC RESONANCE (NMR) MEASUREMENTS | 06-23-2016 |
20160202384 | Correction Of Motion Effect In Nuclear Magnetic Resonance (NMR) Logging | 07-14-2016 |