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| Number | Title | Issue Date |
| 8183523 | System and method for acquiring radiation spectral data in a radiation field and determining effective dose rate and identifying sources of localized radiation A survey method and system for survey method and system for detecting and/or characterizing a radiation field The method may include acquiring energy-dependent radiation spectral data at a location of interest in a radiation field using a detector, wherein the energ... | 05/22/2012 |
| 8093550 | Determining downhole fluid flow Tool for drilling a borehole and method for using such tool. The tool has an apparatus for determining a change in a drilling environment around the borehole that includes a source for generating neutrons to produce a radioactive isotope in a fluid flowing down insi... | 01/10/2012 |
| 7791017 | Method to simultaneously determine pore hydrocarbon density and water saturation from pulsed neutron measurements A method comprising using inelastic and capture gamma-ray count rates from two detectors in a borehole logging tool and determining formation water saturation. In this method the formation water saturation is determined without prior knowledge of the carbon density ... | 09/07/2010 |
| 7554081 | Method and apparatus for determining silicon content of the earth formations in cased well bores Measurements made with a pulsed neutron source and three or more gamma ray detectors are used to estimate the silicon and oxygen content of earth formations. ... | 06/30/2009 |
| 7372018 | Determination of gas pressure and saturation simultaneously A pulsed neutron tool with three or more detectors is used for making measurements inside casing. The measurements may be used to determine gas saturation at a constant gas pressure, pressure at constant gas saturation, or to determine both gas saturation and gas pr... | 05/13/2008 |
| 7365308 | Measurement of formation gas saturation in cased wellbores using pulsed neutron instrumentation A pulsed neutron tool with three or more detectors is used for making measurements inside casing. The measurements may be used to determine gas saturation at a constant gas pressure, pressure at constant gas saturation, or to determine both gas saturation and gas pr... | 04/29/2008 |
| 7361887 | Measurement of formation gas pressure in cased wellbores using pulsed neutron instrumentation A pulsed neutron tool with three or more detectors is used for making measurements inside casing. The measurements may be used to determine gas saturation at a constant gas pressure, pressure at constant gas saturation, or to determine both gas saturation and gas pr... | 04/22/2008 |
| 7334465 | Integrated logging tool for borehole An apparatus for measuring characteristics of earth formations surrounding a borehole, comprises a resistivity measurement device having a multiplicity of antennae spaced between each other in a longitudinal direction of the apparatus. A neutron measurement device o... | 02/26/2008 |
| 7309857 | Gamma ray detectors having improved signal-to-noise ratio and related systems and methods for analyzing materials in an oil well A gamma ray detector assembly for placement in a logging tool in a borehole can include a first gamma ray detector elongated along an axis and having a void extending along the axis. A second gamma ray detector conforms to at least a portion of the void. The first a... | 12/18/2007 |
| 7294829 | Method and apparatus for an improved formation density indicator using pulsed neutron instruments A pulsed neutron source is used in a density logging tool with three or more detectors. This enables compensation for source variations and provides redundant measurements that are used to make borehole corrections and/or corrections for casing. ... | 11/13/2007 |
| 7292942 | Measuring formation density through casing A method of determining formation density in a cased hole environment using a logging tool having a gamma ray source, a long spacing detector, and a short spacing detector that includes developing one or more cased hole calibration relationships that utilize differe... | 11/06/2007 |
| 7285772 | Logging tool with a parasitic radiation shield and method of logging with such a tool It is described a logging tool 20 for underground formations surrounding a borehole 14, comprising an elongated body 21 along a major axis; a collar 22 disposed peripherally around said body 21 having a collar wall defined by an in... | 10/23/2007 |
| 7282704 | Method for determining formation porosity and gas saturation in a gas reservoir Measurements made with porosity and density logging tools in a gas reservoir may differ due to invasion effects. The effects are particularly large on measurement-while-drilling applications where invasion is minimal. Using a Monte-Carlo method, a relationship is es... | 10/16/2007 |
| 7279677 | Measuring wellbore diameter with an LWD instrument using compton and photoelectric effects A method for determining the diameter of a wellbore, the wellbore being drilled by a drill string immersed in weighted mud, the weighted mud having a significant weight fraction of a heavy component. A well logging instrument having a gamma ray source and energy-sen... | 10/09/2007 |
| 7253402 | Apparatus and method for determining thermal neutron capture cross section of a subsurface formation from a borehole using multiple detectors A well logging instrument including a plurality of detectors having different precisions and accuracies, the more precise detectors generally having lower accuracies. The detectors are responsive to the interaction of radiation from a suitable source on the instrume... | 08/07/2007 |
| 7227129 | Flowshot technique A pulsed neutron source irradiates an earth formation. The irradiation produces N16 from O16 in a fluid in the borehole, and the gamma rays produced by the subsequent decay of N16 are detected by a plurality of spaced apart detectors... | 06/05/2007 |
| 7166834 | Method and apparatus for determining the thermal neutron capture cross-section of a subsurface formation from a borehole Data acquired using a pulsed nuclear source are susceptible to two sources of error. One error is due to large statistical noise towards the end of an acquisition window. Another source of error is the contamination of the early portion of the data by borehole and o... | 01/23/2007 |
| 7148471 | Well logging apparatus and method for measuring formation properties A logging tool includes an elongated body housing a neutron source and at least one neutron detector positioned along one side of the neutron source. Some embodiments of the logging tool include at least one gamma ray detector longitudinally separated from and to on... | 12/12/2006 |
| 7139350 | Method and apparatus for measuring radiation in a borehole Apparatus and methods for measuring radiation in a borehole environment using a YAlO3:Ce (YAP) scintillation crystal. Borehole instruments are disclosed which employ a gamma ray detector comprising a YAP scintillator coupled to a light sensing means such ... | 11/21/2006 |
| 7112783 | Neutron measurement method for determining porosity of a formation surrounding a borehole The invention concerns a neutron measurement method for determining porosity of an earth formation surrounding a borehole comprising: conveying a tool along said borehole, wherein said tool comprises a source of neutron radiation a... | 09/26/2006 |
| 7088097 | Method for fitting a sum of exponentials to experimental data by linearization using a numerical integration approximation, and its application to well log data A method for analyzing formations using measurements from a detector in response to energy imparted therein. The measurements have characteristics which exponentially reduce in magnitude with time. The method includes (a) determining, an N-th order integral of the v... | 08/08/2006 |
| 7081616 | Downhole gamma-ray detection A method for evaluating a natural gamma-ray activity within a borehole, comprises the steps of: stabilizing the gain according to a method for stabilizing a gain of a gamma-ray detector for use in a downhole logging tool; ... | 07/25/2006 |
| 7059404 | Variable intensity memory gravel pack imaging apparatus and method An apparatus and method are provided for varying an operating parameter for a nuclear gamma ray tool for evaluating the integrity of gravel packing. The gamma ray outpat intensity and area of investigation are altered by changing a source housing geometry and the ma... | 06/13/2006 |
| 6997257 | Apparatus and method for determining the dip of an underground formation in a cased or uncased borehole A well logging system that has, as its goal, the collection of information normally acquired by a dip log tool based on conductivity or resistivity measurements, but with the advantages of radiation based well logging systems. Unlike conductivity based dip log syste... | 02/14/2006 |
| 6936812 | Apparatus and method for determining density, porosity and fluid saturation of formations penetrated by a borehole A borehole logging system for determining bulk density, porosity and formation gas/liquid fluid saturation of formation penetrated by a borehole. Measures of fast neutron radiation and inelastic scatter gamma radiation, induced by a pulsed neutron source, are combin... | 08/30/2005 |
| 6922455 | Gas-target neutron generation and applications Described herein are integrated systems for generating neutrons to perform a variety of tasks including: on-line analysis of bulk material and industrial process control (as shown in FIG. 1), security interrogation (as shown in FIG. 2), soil and enviro... | 07/26/2005 |
| 6825459 | Dual compensated chlorine logging tool A well logging tool has a neutron source for irradiating formation surrounding a borehole. Two detectors are mounted in a spaced-apart vertical relationship within the tool pressure-resistant housing. Each detector detects capture gamma radiation across the entire g... | 11/30/2004 |
| 6766855 | Apparatus and method for determining the dip of an underground formation in a cased or uncased borehole A well logging system that has, as its goal, the collection of information normally acquired by a dip log tool based on conductivity or resistivity measurements, but with the advantages of radiation based well logging systems. Unlike conductivity based dip log syste... | 07/27/2004 |
| 6704385 | Method for simulating the response of a detector of radiation emitted by radioactive objects and method for controlling nuclear fuel elements using said simulation Process for simulation of the response of a detector of radiation emitted by radioactive objects and process for inspection of nuclear fuel elements using this simulation. The objects (16) contain radioelements or mixes of radioelements. Radioactive emiss... | 03/09/2004 |
| 6665616 | Method for determining decay characteristics of multi-component downhole decay data Measurements from many logging instruments such as Gamma ray counts from a pulsed neutron instrument, typically have a spectrum that contains a plurality of exponentially decaying components. The slowest decaying component is obtained by fitting a single ... | 12/16/2003 |
| 6590202 | Standoff compensation for nuclear measurements A nuclear logging-while-drilling measuring systems, and the correction of the formation property measurements for adverse effects of instrument standoff from the borehole wall, is disclosed. Detector responses for one or more downhole detectors are sample... | 07/08/2003 |
| 6376838 | Formation evaluation combination system for petrophysical well log analysis A method of measuring characteristics of a geologic formation, using the time, energy and spatial spectra of gamma rays induced by an accelerator, which allows (i) the measurement of the photoelectric absorption (Pe) factor of the formation usi... | 04/23/2002 |
| 6308561 | Well logging apparatus A well logging device of compact reduced diameter compared to the prior art, such well logging device having both short spaced and long spaced types of gamma ray crystal detectors installed in a measurements skid that comprises a relatively small diameter... | 10/30/2001 |
| 6150655 | Inferential measurement of photoelectric absorption cross-section of geologic formations from neutron-induced, gamma-ray spectroscopy A method for inferring the photoelectric absorption of a formation by directly mapping spectroscopic measurements of gamma rays induced in the formation using a fast neutron source. The mapping is accomplished by creating a polynomial function based on co... | 11/21/2000 |
| 6064063 | Method for determining thermal neutron capture cross-section of earth formations using measurement from multiple capture gamma ray detectors A method for determining the thermal neutron capture cross-section of an earth formation penetrated by a wellbore from counts of capture gamma rays. The capture gamma rays are detected at spaced apart locations after bombarding the formations with high en... | 05/16/2000 |
| 6005244 | Detecting bypassed hydrocarbons in subsurface formations A tool for use in analyzing a subsurface formation for the presence of hydrocarbon includes a neutron generator capable of generating a burst of neutrons at a high energy level, some of which will collide inelastically with atomic nuclei in the subsurface... | 12/21/1999 |
| 5949069 | Method and apparatus for measuring volumetric water flow rates in highly inclined wellbores A method for determining a volume fraction of water moving in a predetermined direction along a highly inclined conduit. The method includes measuring a fractional volume of water occupying the conduit at a plurality of locations along the conduit. An oxy... | 09/07/1999 |
| 5900627 | Formation density measurement utilizing pulse neutrons A device for measuring the density of a formation uses a high-energy pulsed neutron source which induces gamma rays in the formation, and determines a gamma diffusion length of the formation based on the attenuation of gamma rays produced by inelastic sca... | 05/04/1999 |
| 5825024 | Multidetector pulsed-neutron through-tubing cased-hole density measurement sonde An apparatus for measuring the density of a subterranean formation from within a wellbore, especially a cased wellbore. The apparatus has an energy source configured to generate 14 MeV of neutrons in pulses of 20 microseconds or less. The apparatus has at... | 10/20/1998 |
| 5808298 | Method for determining formation hydrocarbon saturation and wellbore hydrocarbon holdup from multidetector carbon-oxygen measurements A method for determining oil saturation in an earth formation penetrated by a wellbore. Measurements of relative amounts of carbon and oxygen are made by spectral analysis of neutron-induced inelastic gamma rays detected from the earth formation at spaced... | 09/15/1998 |
