| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 250269300 | Having gamma source and gamma detector | 18 |
| 20090039242 | Method of Determining Petro-Physical Information with High Energy Gamma Rays - Methods for density logging utilizes gamma-rays above a pair-production threshold so as to determine lithology information of formations whereby to correct a measured density data. | 02-12-2009 |
| 20090152456 | BOREHOLE TESTER APPARATUS AND METHODS FOR USING NUCLEAR ELECTROMAGNETIC RADIATION TO DETERMINE FLUID PROPERTIES - Apparatus and methods for determining one or more fluid parameters of interest by irradiating fluid with a source of nuclear electromagnetic radiation and subsequently measuring attenuation and absorption properties of the fluid from which parameters of interest are determined. Measurements are made with a formation tester tool comprising preferably two functionally configured flow lines. The source simultaneously irradiates fluid contained in opposing irradiation sections that can be integral sections of each of the two flow lines. A radiation detector is dedicated to each irradiation section and measures radiation attenuation and absorption properties fluid contained within each flow line section. Absolute and relative fluid parameters of interest are determined from the responses of the two radiation detectors. | 06-18-2009 |
| 20090321622 | DETERMINING DOWNHOLE FLUID FLOW - Apparatus for determining properties of a borehole and a formation around the borehole. The apparatus comprising a source for generating nuclear particles, a detector for measuring a effect of the nuclear particles on a fluid flowing in the borehole and a second detector for measuring an effect of the nuclear particles on the formation. The source is arranged to generate the nuclear particles in a manner that enables the measuring of the first and the second detector to be performed simultaneously. | 12-31-2009 |
| 20100065730 | COMPACT GAMMAMETER - This invention relates to a compact density measuring instrument for measuring density of fluids in a volume in a container, especially in a fluid flow in a pipe, the instrument comprising a radiation source in the gamma range positioned on one side of the fluid and a detector positioned on the opposite side of the fluids for receiving said radiation, and the fluid being contained in the container, wherein the source is positioned in a source housing, said source housing being at least partially fitted into a corresponding recess in the container wall, said source housing comprises a source holder containing the gamma source positioned in the holder axis and comprising a coaxial opening from the source through one end of the holder, said one end adapted to be aimed toward the fluid. | 03-18-2010 |
| 20100252725 | LOGGING TOOL AND METHOD FOR DETERMINATION OF FORMATION DENSITY - In connection with a downhole density logging method and tool, the gamma ray source and detectors are substantially non-shielded (that is, they are omni-directional). As a result the gamma ray emission produced by the ‘omni-directional’ source is non-collimated and the back-scattered gamma rays counted by the omni-directional detectors are also non-collimated. Testing has shown that density logging through well casing is viable using this system. | 10-07-2010 |
| 20100252726 | GAMMA RAY GENERATOR - An instrument for performing measurements downhole, includes an irradiator oriented to irradiate sub-surface materials surrounding the instrument, the irradiator including at least one neutron source disposed proximate to a moderator for providing a source of inelastic gamma photons and also disposed proximate to a material for providing a source of capture gamma photons; and a first detector and a second detector, each detector for detecting gamma rays and oriented in a relationship to the irradiator for receiving gamma photons from at least one of the irradiator and the formation. A method for irradiating sub-surface materials is provided. | 10-07-2010 |
| 20110198489 | LITHOLOGY PAIR RATIO: A RATIO-BASED LITHOLOGY INDICATOR USING PAIR PRODUCTION - The present disclosure relates to borehole logging methods and apparatuses for estimating formation properties using nuclear radiation, particularly an apparatus and method for estimating a formation lithology parameter. The method may include using gamma ray count or count rate information to estimate a formation lithology parameter that may be one of, but not limited to: Z | 08-18-2011 |
| 20110204216 | GAMMA-GAMMA DENSITY MEASUREMENT SYSTEM FOR HIGH-PRESSURE, HIGH-TEMPERATURE MEASUREMENTS - A downhole gamma ray density measurement system is described. The gamma ray density measurement system includes a pressure housing and a gamma ray source within the pressure housing. One or more detectors within the pressure housing detect gamma radiation. One or more low-attenuation inserts may be located in the pressure housing near the gamma ray source and/or one or more of the detectors. One or more high-attenuation inserts may be located in the pressure housing near the gamma ray source and/or one or more of the detectors. | 08-25-2011 |
| 20110284731 | GAMMA-RAY DETECTORS FOR DOWNHOLE APPLICATIONS - Methods and related systems are described for gamma-ray detection. A gamma-ray detector is made depending on its properties and how those properties are affected by the data analysis. Desirable properties for a downhole detector include; high temperature operation, reliable/robust packaging, good resolution, high countrate capability, high density, high Z, low radioactive background, low neutron cross-section, high light output, single decay time, efficiency, linearity, size availability, etc. Since no single detector has the optimum of all these properties, a downhole tool design preferably picks the best combination of these in existing detectors, which will optimize the performance of the measurement in the required environment and live with the remaining non-optimum properties. A preferable detector choice is one where the required measurement precision (logging speed) is obtained for all of the required inelastic elements and/or minimization of unwanted background signals that complicate the data analysis. | 11-24-2011 |
| 20110284732 | Well Flaw Detection System (Embodiments) - This invention relates to nondestructive control, more specifically, to the detection of cracks, flaws and other defects in oil and gas wells and cementing quality control. | 11-24-2011 |
| 20120119077 | Method and Apparatus For Interrogating A Subterranean Annulus - Monitoring scattered gamma rays is used to identify substances disposed between coaxial tubulars disposed in a subterranean wellbore. Gamma rays are strategically directed from within an inner most tubular and into the annulus, some of the gamma rays scatter from the substance between the tubulars and are detected with detectors set a designated axial distance from the gamma ray source. Gamma rays also scatter from fluid within the tubular, a ratio of the gamma rays detected that scatter from the fluid in the tubular and from the substance can be used to determine the substance. | 05-17-2012 |
| 20130009049 | Method For Inspecting A Subterranean Tubular - Substances on or adjacent a tubular disposed in a subterranean wellbore can be detected and/or their presence identified by monitoring gamma rays scattered from the substances. The substances include deposits on a sidewall of the tubular and liquid contained in the tubular. Examples of the deposits include asphaltenes, paraffins, scale, sand, and the like. Gamma rays are strategically directed from a tool disposed within the tubular and to adjacent a sidewall of the tubular. Some of the gamma rays scatter from the substances adjacent the tubular and are detected with detectors set a designated axial distance from the gamma ray source. | 01-10-2013 |
| 20130161503 | Systems and Methods Using Tunable Differential Gravimeter - Systems and methods are provided for determining a property, e.g., density, of a geological formation based on Einstein's theory of gravitation. A gravitational potential difference is determined between two positions of the geological formation by measuring a frequency shift of radiation travelling from a source to an absorber of a differential gravimeter. The differential gravimeter can be a part of a downhole tool. The gravitational potential difference determined can be used to determine the property of the geological formation. | 06-27-2013 |
| 20130161504 | Systems and Methods Using Tandem Gravimeter - Systems and methods are provided for determining a property, e.g., density, of a geological formation based on Einstein's theory of gravitation. A tandem-structured gravimeter uses two gamma radiations emitted to two directions to determine a gravitational potential difference between two positions of the geological formation. The gravimeter can be a part of a downhole tool. The gravitational potential difference determined can be used to determine the property of the geological formation. | 06-27-2013 |
| 20130214145 | Gamma-Ray Detectors For Downhole Applications - Methods and related systems are described for gamma-ray detection. A gamma-ray detector is made depending on its properties and how those properties are affected by the data analysis. Desirable properties for a downhole detector include; high temperature operation, reliable/robust packaging, good resolution, high countrate capability, high density, high Z, low radioactive background, low neutron cross-section, high light output, single decay time, efficiency, linearity, size availability, etc. Since no single detector has the optimum of all these properties, a downhole tool design preferably picks the best combination of these in existing detectors, which will optimize the performance of the measurement in the required environment and live with the remaining non-optimum properties. A preferable detector choice is one where the required measurement precision (logging speed) is obtained for all of the required inelastic elements and/or minimization of unwanted background signals that complicate the data analysis. | 08-22-2013 |
| 20130270431 | WELL-LOGGING TOOL FOR DETERMINING PROPERTIES IN A FLOWSTREAM - A full bore spectral gas holdup tool that measures gas holdup that is corrected for effects of the flowstream lamination and the salinity of the liquid in the a flowstream. The basic methodology utilizes spectral data from two gamma ray detectors at different spacings from a nuclear source that emits gamma radiation. | 10-17-2013 |
| 20140291500 | Method for Evaluating Voids in a Subterranean Formation - Voids adjacent a wellbore wall and in a region surrounding a wellbore wall can be detected by monitoring gamma rays scattered from the fractures. Gamma rays are strategically directed from a tool disposed within the wellbore and to the wall and/or the region. Some of the gamma rays scatter from the voids and are detected with detectors set a designated axial distance from the gamma ray source. In addition to identifying the presence of the voids, the location and size of the fractures/perforations is also estimated. Time lapsed imaging of the wellbore wall can yield changes in the voids that in turn can affect permeability of the well. Examples of the voids include fractures and/or perforations. | 10-02-2014 |
| 20140374582 | AZIMUTHAL CEMENT DENSITY IMAGE MEASUREMENTS - Well logging method and logging tool for measuring cement density and thickness at different azimuth angles for a cemented, cased well. The method uses a gamma source, a short-spaced detector, a long-spaced detector, and preferably a backscatter detector, where the detector-to-source spacings are designed for calculating ( | 12-25-2014 |
