Patent application number | Description | Published |
20080206887 | METHODS FOR IDENTIFICATION AND QUANTIFICATION OF MULTICOMPONENT-FLUID AND ESTIMATING FLUID GAS/ OIL RATIO FROM NMR LOGS - A method for determining a proportion of a hydrocarbon constituent in a mixture including at least one hydrocarbon, includes determining at least one nuclear magnetic resonance (NMR) property for at least one hydrocarbon constituent in the mixture; correlating an NMR response for the property for each hydrocarbon constituent in the mixture; and from the correlating, calculating the proportion of at least the constituent. A computer program product is also provided. | 08-28-2008 |
20080221800 | Method of Determining Downhole Formation Grain Size Distribution Using Acoustic and NMR Logging Data - The grain size distribution of a pore-scale geometric model of a clastic earth formation are adjusted so that the NMR relaxation time distribution output of the model matches a measured NMR distribution, and an acoustic velocity output of the model matches a measured acoustic velocity (compressional and/or shear). Fluid drainage and imbibing can be simulated. Additional properties of the earth formation are predicted using the pore-scale model. The additional properties may be based on additional measurements of properties of a fluid in the formation. | 09-11-2008 |
20080234937 | DETERMINATION OF GAS SATURATION RADIAL PROFILE FROM MULTI-FREQUENCY NMR DATA - A method for determining fluid saturation in a formation at a plurality of radial depths near a wellbore, the method including: obtaining multi-frequency nuclear magnetic resonance (NMR) response data for the formation; and processing the data to determine simultaneously the fluid saturation at each radial depth. A computer program product is provided. | 09-25-2008 |
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 |
20090210159 | Echo-Decay-Acceleration Data Acquisition Method for Gas Identification Using a Low-Field Gradient - A first NMR echo train is acquired with a single TE. A second NMR echo train is acquired with a first portion having the same TE and the second portion having a longer TE. When measurements are made with a low magnetic field gradient, processing the two echo trains can be used to determine gas in the formation. | 08-20-2009 |
20100088033 | DATA ACQUISITION AND PROCESSING FOR INVASION PROFILE AND GAS ZONE ANALYSIS WITH NMR DUAL OR MULTIPLE INTERECHO SPACING TIME LOGS - A method for obtaining a parameter of interest related to an earth formation, the method including: obtaining nuclear magnetic resonance (NMR) data from an NMR tool investigating the earth formation with a plurality of pulse sequences of radio frequency energy, each pulse sequence having a unique frequency, a first train of pulses having a first interecho time (TE | 04-08-2010 |
20110137567 | Method and Apparatus to Incorporate Internal Gradient and Restricted Diffusion in NMR Inversion - Pulse sequences are applied to a fluid in an earth formation with an external static magnetic field and NMR spin echo signals are obtained. The received NMR signals are affected by internal field gradients due to a contrast in magnetic susceptibility between the grains of the formation matrix and the fluid in the pore space. Processing of the data gives the relaxation time and diffusivity of the fluid. | 06-09-2011 |
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 |
20120065888 | Method and Apparatus for Predicting Petrophysical Properties From NMR Data in Carbonate Rocks - An apparatus and method for determining a property of an earth formation using a radial basis function derived from a catalog of rock samples. Parameters of a Thomeer capillary pressure fitting curve are derived and used for analyzing rocks with unimodal or multimodal pore size distributions. | 03-15-2012 |
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 |
20120092006 | Multiphase Flow Measurement Using Nuclear Magnetic Resonance - A method and apparatus for estimating a flow rate of a phase of a multiphase fluid is disclosed. A first velocity distribution is obtained for a first set of nuclei in the fluid from a Nuclear Magnetic Resonance (NMR) signal received for the fluid in response to a first NMR excitation signal. A second velocity distribution is obtained for a second set of nuclei in the fluid from an NMR signal received for the fluid in response to a second NMR excitation signal. A velocity of the phase is estimated from the first velocity distribution and the second velocity distribution. The flow rate of the phase is estimated using the estimated velocity of the phase and an estimated volume fraction of the phase. | 04-19-2012 |
20120092007 | NMR Flow Metering Using Velocity Selection and Remote Detection - A method and apparatus for estimating a flow rate of a phase of a multiphase fluid is disclosed. In the first method, nuclei in the fluid are polarized over two distances and a measured magnetization gives the relative fraction of two components of the fluid for a selected velocity. In the second method, nuclei in the fluid are polarized over a specified distance and measurements of the decay of spin echo signals is used to give the relative fraction of two components of the fluid for the selected velocity. | 04-19-2012 |
20120095741 | Predicting Downhole Formation Volumetric Sand Production Using Grain-Scale Rock Models - A method, apparatus and computer-readable medium for estimating sand production from an earth formation is disclosed. A grain-scale formation model of the earth formation is created, wherein a value obtained from the grain-scale formation model compares to a value of a measured property of the earth formation. A fluid parameter of the grain-scale formation model is determined and a movement of at least one grain of the grain-scale formation model is determined due to the determined fluid parameter. The sand production is estimated from the determined movement of the at least one grain. | 04-19-2012 |
20120101732 | Integrated Source-Free Method and Apparatus for Porosity Determination: NMR Calibrated Acoustic Porosity - NMR porosity measurements made in a gas free-formation are used to calibrate acoustic measurements. The calibration parameters are then used in conjunction with estimates of shale content to provide improved estimates of formation porosity in shaly intervals which may include a gas. | 04-26-2012 |
20120209541 | Multiphase Meter to Provide Data for Production Management - A method and apparatus for determining a volume of a phase of a multiphase fluid flowing in a production tubular is provided. A magnetic field is imparted on the fluid to align nuclei of the multiphase fluid along a direction of the magnetic field. A radio frequency signal is transmitted into the multiphase fluid to excite the nuclei, and a signal is detected from the nuclei responsive to the transmitted radio frequency signal. An amplitude of the detected signal is determined and the volume of the phase flowing in the production tubular is determined using the determined amplitude and an amplitude of a calibration signal. | 08-16-2012 |
20120234533 | PRECISION MARKING OF SUBSURFACE LOCATIONS - A method for performing a downhole operation includes marking at least one location in a wellbore using a magnetized material. The magnetized material may generate a magnetic field stronger than a magnetic field generated in the wellbore by a surrounding formation. | 09-20-2012 |
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 |
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 |
20140312901 | Miniature NMR Drill Cutting Analyzer and Methods of Use - A nuclear magnetic resonance (NMR) sample analyzer has a plurality of NMR units arrayed in a predetermined relationship to each other. Each of the NMR units includes a sample chamber having a sensitive volume for containing a sample to be analyzed; a radio frequency (RF) transmitting and receiving device proximal the sample chamber; and a magnet surrounding the RF transmitting and receiving device and sample chamber for generating a substantially uniform magnetic field within the sensitive volume and substantially no magnetic field beyond an outside wall of the magnet. | 10-23-2014 |
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 |