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| Number | Title | Issue Date |
| 7544929 | Borehole imaging and standoff determination using neutron measurements Apparatus and methods for determining borehole diameter and standoff for neutron porosity logging systems. The apparatus comprises an isotopic neutron source, a single epithermal neutron detector and two thermal neutron detectors, where all detectors are at differen... | 06/09/2009 |
| 7439494 | 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... | 10/21/2008 |
| 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 |
| 7365307 | Sigma/porosity tools with neutron monitors A tool for formation logging includes a support configured for movement in a borehole; a neutron source disposed on the support; a neutron monitor disposed on the support and configured to monitor an output of the neutron source; a gamma-ray detector disposed on the... | 04/29/2008 |
| 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 |
| 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 |
| 7254486 | Method and apparatus for shale bed detection in deviated and horizontal wellbores A relative dip angle of a deviated borehole is determined from natural gamma ray measurements. Dip corrected measurements are processed to determine the thickness of thin beds, and the peak gamma ray response in thin beds. ... | 08/07/2007 |
| 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 |
| 7102125 | Method of logging a borehole In the field of wellbore data logging it is known to use isotopic neutron sources in a neutron capture logging technique. However, continuous isotopic sources are unpopular for regulatory and safety reasons. Attempts to employ neutron generator tubes to gener... | 09/05/2006 |
| 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 |
| 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 |
| 6495837 | Geometrically optimized fast neutron detector An improved fast neutron detector fabricated with alternating layers of hydrogenous, optically transparent, non scintillating material and scintillating material. Fast neutrons interact with the hydrogenous material generating recoil protons. The recoil p... | 12/17/2002 |
| 5789752 | Thermal neutron porosity measurement apparatus and method using an accelerator type high-energy neutron source An apparatus for measuring the porosity of earth formations penetrated by a wellbore. The apparatus includes an elongated housing adapted to traverse the wellbore, a controllable source which emits bursts of high-energy neutrons, a near detector primarily... | 08/04/1998 |
| 5668369 | Method and apparatus for lithology-independent well log analysis of formation water saturation A system and method of determining porosity and water saturation of a formation surrounding a wellbore is disclosed. Well logs are taken to obtain near and far thermal and epithermal neutron log measurements, and to obtain pulsed neutron capture log measu... | 09/16/1997 |
| 5572021 | Methods of detecting the locations of well treating fluids Methods are provided for detecting the surface and/or subterranean locations of well treating fluids after the treating fluids have been introduced into wells and used for performing treatments therein. The methods of determining the subterranean location... | 11/05/1996 |
| 5539225 | Accelerator-based methods and apparatus for measurement-while-drilling Measurement-while-drilling apparatus includes a 14 MeV neutron accelerator, a near-spaced neutron detector which primarily senses source neutrons and whose output is proportional to source strength, one or more intermediately-spaced epithermal neutron det... | 07/23/1996 |
| 5536938 | Pulsed neutron decay logging A borehole logging tool having a pair of spaced-apart detectors records intensity signals representing the die-away of nuclear radiation in a subsurface formation. Weighted moments of the intensity signals as well as of a model are produced. Corresponding... | 07/16/1996 |
| 5528030 | System for determining gas saturation of a formation and a wellbore through casing A system for determining formation gas saturation in a cased wellbore which includes a neutron logging tool having a source, a first neutron detector offset towards the wellbore primarily sensitive to the wellbore and a second detector spaced further from... | 06/18/1996 |
| 5300770 | Apparatus for producing a porosity log of a subsurface formation corrected for detector standoff A borehole logging tool is lowered into a borehole traversing a subsurface formation and a neutron detector measures the die-away of nuclear radiation in the formation. Intensity signals are produced representing the die-away of nuclear radiation as the l... | 04/05/1994 |
| 5235185 | Formation sigma measurement from thermal neutron detection A tool which contains a pulsed accelerator neutron source and means for making timing measurements of the thermal neutron response in a localized portion of the environment immediately surrounding the borehole. Formation sigma is determined by parameteriz... | 08/10/1993 |
| 5128541 | Thermal decay time logging method A borehole logging method for determining thermal neutron decay characteristics of a formation surrounding the borehole, comprises the following steps. The formation surrounding the borehole is irradiated from a location within the borehole with a burst o... | 07/07/1992 |
| 4990774 | Technique for obtaining high vertical resolution formation capture cross sections from pulsed neutron logs Improved vertical resolution from pulse neutron logs is obtained by the disclosed process; a pulse of fast neutrons is emitted from a source and counts are taken at near and far dectors. This is done repetitively so that the interval between neutron burst... | 02/05/1991 |
| 4952801 | Logging tool for measuring the macroscopic thermal neutron capture cross section of borehole fluids For use in a downhole oil well logging tool which is enclosed in a sonde and suspended on an armored logging cable, a means for measuring the macroscopic thermal neutron capture cross section of the borehole fluid is set forth. In the preferred embodiment... | 08/28/1990 |
| 4816674 | Determining a formation porosity from neutron logging information A method for determining the porosity of a subsurface geological formation traversed by a borehole is provided. The method generally comprises obtaining a means which relates ranges of apparent formation porosity ($c;a) as determined by a ne... | 03/28/1989 |
| 4786796 | Method for determining formation characteristics with enhanced vertical resolution A method for determining a characteristic of a subsurface geological formation enhances the vertical resolution of dual-detector measurements by utilizing a continuous calibration factor which is obtained from an environmentally compensated characteristic... | 11/22/1988 |
| 4760252 | Well logging tool with an accelerator neutron source In the illustrative embodiments of the invention disclosed, a neutron porosity well logging tool includes a D-T neutron accelerator, a fast-neutron monitor for monitoring accelerator output, near and far epithermal neutron detectors for deriving a primary... | 07/26/1988 |
| 4642460 | Technique for locating injected gas in oil bearing formations behind casing A method for monitoring the movement of injected gas in an oil bearing formation behind the well casing is disclosed. A compensation neutron log is obtained from the well. The count rates are normalized to delineate water zones, gas zones and shale zones.... | 02/10/1987 |
| 4641028 | Neutron logging tool A well logging instrument for use in a cased well bore and containing a sealed source of fast neutrons and two identical thermal neutron detectors with a volume of four atmospheres of helium-3 gas. The formation surrounding the cased well bore is bombarde... | 02/03/1987 |
| 4593195 | Method and device for obtaining information relative to organic materials or minerals likely to be contained in geological formations A method for obtaining information relating to material contained in geological formations. According to this method; these geological formations are subjected to at least one flow of so called incident neutrons having a substantially well defined energy,... | 06/03/1986 |
| 4570067 | Method and apparatus for formation logging using position sensitive neutron detectors One or more position sensitive neutron detectors in a borehole logging tool provide for making dual-porosity dual-spaced neutron porosity logs with fewer detectors and a more compact tool, by separately detecting both thermal and epithermal neutrons in a ... | 02/11/1986 |
| 4529878 | Determination of residual oil saturation using thermal neutron decay measurements without knowledge of the formation or formation fluids A method for determining residual oil saturation of a formation using an improved log-inject-log technique that does not require knowledge of the porosity of the formation or any other property of the formation or its indigenous fluids. The method consist... | 07/16/1985 |
| 4500781 | Method and apparatus for determining neutron characteristics of borehole fluids A source of high energy neutrons and a detector responsive to the thermal neutron population decay rate are utilized in a well logging instrument. The instrument is positioned within a borehole and at least a portion of the fluids within the borehole are ... | 02/19/1985 |
| 4459480 | Use of pulsed neutron logging to evaluate perforation washing An improved method of locating and measuring voids behind casings of wells in unconsolidated formations is disclosed featuring first and second logging operations carried out before and after perforation washing respectively to locate voids. The voids may... | 07/10/1984 |
| 4384205 | Neutron method and apparatus for determining total cross-section A method and an apparatus for quantitatively determining the macroscopic thermal neutron absorption cross-section of a geological formation traversed by a borehole is disclosed. The method comprises the steps of irradiating the formation with neutrons fro... | 05/17/1983 |
| 4379228 | Neutron-neutron-logging A borehole logging tool includes a steady-state source of fast neutrons and three thermal neutron flux detectors. First and second detectors measure the same thermal neutron flux parameter and the third detector measures a different thermal neutron flux m... | 04/05/1983 |
| 4350887 | Method of assaying uranium with prompt fission and thermal neutron borehole logging adjusted by borehole physical characteristics Uranium formations are assayed by prompt fission neutron logging techniques. The uranium in the formation is proportional to the ratio of epithermal counts to thermal or eqithermal dieaway. Various calibration factors enhance the accuracy of the measureme... | 09/21/1982 |
| 4316086 | Method and apparatus for measuring neutron characteristics of material surrounding a borehole A pulsed source of fast neutrons and a radiation detector system are utilized in a well logging instrument, the detector being responsive to the thermal neutron population decay rate. The inverse of the decay rate is proportional to the measured macroscop... | 02/16/1982 |
| 4302669 | Neutron thermalization time logging Method and apparatus for pulsed neutron logging employing detectors of different energy-dependent sensitivities to neutrons at energy levels less than the chemical binding energy of hydrogen in hydrogenous fluids found in subterranean formations. Fast neu... | 11/24/1981 |
| 4292518 | Methods and apparatus for measuring thermal neutron decay characteristics of earth formations In the exemplary embodiments of the invention disclosed, thermal neutron decay characteristics of an earth formation, e.g. the thermal neutron decay time constant ͌ and the macroscopic capture cross section Σ, are measured by detecting indications of th... | 09/29/1981 |
| 4267447 | Methods and apparatus for measuring thermal neutron decay characteristics of earth formations In the exemplary embodiments of the invention disclosed, thermal neutron decay characteristics of an earth formation, e.g. the thermal neutron decay time constant ͌ and the macroscopic capture cross section Σ, are measured by detecting indications of th... | 05/12/1981 |
