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| Number | Title | Issue Date |
| 7968841 | Force and acceleration sensor using four wave mixing technique A sensor for measuring force, the sensor including: a light source; and a mixing medium in optical communication with the light source and exposed to the force; wherein four wave mixing of light interacting with the mixing medium provides a signal that indicates the... | 06/28/2011 |
| 7893398 | Compensated mineralogy tool and processing A method for estimating information about a formation, the method including obtaining a first set of radiation data substantially influenced by the formation and non-formation materials; obtaining a second set of radiation data substantially influenced by the non-fo... | 02/22/2011 |
| 7633058 | Hermetically sealed packaging and neutron shielding for scintillation-type radiation detectors A well logging instrument includes a source of high energy neutrons arranged to bombard a formation surrounding the instrument. A scintillator sensitive to gamma radiation resulting from interaction of the high energy neutrons with the formation is disposed in the i... | 12/15/2009 |
| 7598485 | Temperature and pressure sensor using four wave mixing technique A sensor for measuring at least one of temperature and pressure in a borehole, the sensor including a mixing medium disposed in a housing adapted for insertion into the borehole, the mixing medium exposed to at least one of the temperature and the pressure; wherein ... | 10/06/2009 |
| 7566867 | Apparatus and method for detecting gamma ray radiation An apparatus for detecting gamma ray (GR) radiation having a plurality of detector cells arranged in an array is disclosed. Each cell includes a housing having an aperture, the housing comprising a GR absorbing material, and a GR detector disposed within the housing... | 07/28/2009 |
| 7544928 | High resolution gamma measurements and imaging A method for measuring radiation in a borehole, the method including placing a detector comprising a scintillator and a plurality of photodetectors in the borehole; detecting a radiation interaction with a first photodetector; detecting the radiation interaction wit... | 06/09/2009 |
| 7482579 | Method and apparatus for high resolution gamma ray measurements A method for measuring radiation, the method includes selecting at least two radiation detectors, each detector having a spatial resolution that differs from the spatial resolution of other detectors; measuring the radiation with the detectors; and combining a respo... | 01/27/2009 |
| 7379592 | System and method for significant dust detection and enhancement of dust images over land and ocean A new processing capability for dust enhancement over land or water using image data from the Sea-viewing Wide Field of View Sensor (SeaWiFS) has been developed for Naval meteorology/oceanography (MetOc) operations support. The data are captured via direct broadcast... | 05/27/2008 |
| 7328106 | Method of correcting density logs for the presence of the casing A gas detection method includes carrying out respective neutron and density logs, using neutron and density detectors, along a length of well. The density log is corrected for the dimensions and properties of the well casing. The corrected density log is then combin... | 02/05/2008 |
| 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 |
| 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 |
| 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 |
| 7242803 | System and method for significant dust detection and enhancement of dust images over land and ocean A new processing capability for desert dust enhancement using imager data from the Sea-viewing Wide Field of View Sensor (SeaWiFS) has been developed for Naval meteorology/oceanography (MetOc) operations support. The data are captured via direct broadcast high-resol... | 07/10/2007 |
| 7142625 | Nuclear material detection apparatus and method A device for detecting photonuclear-induced neutrons is described herein. One embodiment of the device may comprise a neutron detector and a detection circuit. The neutron detector may comprise a detector output. The detection circuit may be operatively connected to... | 11/28/2006 |
| 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 |
| 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 |
| 6909969 | Method of through-casing gas detection A gas detection method includes carrying out respective neutron and density logs, using neutron and density detectors, along a length of well. The density log is corrected for the dimensions and properties of the well casing. The corrected density log is then combin... | 06/21/2005 |
| 6891194 | Active matrix substrate, electromagnetic detector, and liquid crystal display apparatus An electromagnetic detector includes an insulating substrate, whereon a charge storage capacitor, a charge collection electrode connected to the charge storage capacitor, and a semiconductor film having electromagnetic conductivity are laminated in this order. The c... | 05/10/2005 |
| 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 |
| 6700115 | 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... | 03/02/2004 |
| 6552333 | Apparatus and methods for determining gravel pack quality Apparatus and method for determining the integrity or quality of a gravel pack positioned between the casing and gravel pack screen of a subterranean borehole, with the method including azimuthally scanning the gravel pack for radiation, with detection of... | 04/22/2003 |
| 6476384 | Methods and apparatus for downhole fluids analysis A method of determining GOR comprising subjecting a fluid to spectroscopic analysis at a first wavelength sensitive to gas and a second wavelength sensitive to oil, determining a response matrix for the contribution of gas at the first and second waveleng... | 11/05/2002 |
| 6403740 | Vinyl fluoride interpolymers Interpolymers of 1-99 mol % vinyl fluoride and 99-1 mol % of at least one highly fluorinated monomer such as tetrafluoroethylene are disclosed. The interpolymers are characterized by the presence of ionic end groups and are prepared by polymerizing VF and... | 06/11/2002 |
| 6285026 | Borehole caliper derived from neutron porosity measurements A system for measuring the size of a borehole penetrating an earth formation is disclosed. The system uses a neutron source and a least one neutron detector. The neutron detector responds primarily to the composite hydrogen content of material within the ... | 09/04/2001 |
| 5939717 | Methods and apparatus for determining gas-oil ratio in a geological formation through the use of spectroscopy Methods according to the invention include providing an OFA tool which subjects formation fluids to NIR illumination and which provides a spectral measurement of peaks at about 6,000 cm-1 and about 5,800 cm-1. The methods according t... | 08/17/1999 |
| 5659169 | Formation density sensor having detector array and method of calculating bulk density and correction A method of measuring the density of an earth formation penetrated by a wellbore. The method includes irradiating the earth formation with gamma rays from a source, detecting Compton scattered gamma rays at a plurality of locations spaced apart from the s... | 08/19/1997 |
| 5528029 | Logging method and apparatus using a pad to measure density A method of determining a physical parameter of geological formations having a borehole passing therethrough by using a sonde lowered down the borehole at the end of a cable and including a source of gamma radiation, a very near detector, a near detector,... | 06/18/1996 |
| 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 |
| 5525797 | Formation density tool for use in cased and open holes An improved formation density logging tool is provided that is effective in cased holes. The improved tool utilizes three detectors: a first detector for primarily compensating for the casing; a second detector for primarily compensating for the cement; a... | 06/11/1996 |
| 5508514 | Well logging device with a pad The invention concerns a well logging device with a pad, characterized in that the pad has a nuclear sensor with a gamma ray source and two detectors separated by a space in the longitudinal direction, and a second sensor of different type located in said... | 04/16/1996 |
| 5481105 | Neutron backscatter gravel pack logging sonde with azimuthal scan capability An apparatus (sonde) and method of measuring density, or gravel pack quality, in a cased well borehole using a fast neutron source and one or more thermal neutron detectors is described. In one embodiment, a neutron source creates a fast neutron flux whic... | 01/02/1996 |
| 5471057 | Method and apparatus for determining elemental concentrations for γ r a A method for determining the elemental concentrations in an underground formation by irradiating the formation with neutrons, detecting the γ ray spectrum arising from neutron capture by the formation and analyzing the spectrum to determine elemental con... | 11/28/1995 |
| 5408097 | Method and apparatus for correcting natural gamma ray measurements for borehole fluid effects A method and apparatus for detecting natural gamma-ray signals of an earth formation and correcting these gamma-ray signals for effects from borehole gamma-rays. Gamma-ray signals are detected at two detector locations in the borehole. The borehole effect... | 04/18/1995 |
| 5250806 | Stand-off compensated formation measurements apparatus and method Apparatus and method for measuring density, porosity and other formation characteristics while drilling is disclosed. The apparatus, preferably housed in a drill collar and placed within a drill string, includes a source of neutrons and a source of gamma ... | 10/05/1993 |
| 5184692 | Retrievable radiation source carrier A retrievable radiation source carrier assembly for a logging while drilling tool is disclosed. The carrier includes a solid rod or member of high strength and low elastic modulus that connects the housings of at least two radiation sources. In a preferre... | 02/09/1993 |
| 5097123 | Broad energy spectra neutron source for logging and method Logging method and tool string for identifying and determining the concentrations of subsurface formation elements next to a borehole, by (i) using a broad energy spectra neutron source (such as a chemical source, like AmBe), and (ii) detecting and counti... | 03/17/1992 |
| 5081351 | Method and apparatus for borehole correction in capture gamma ray spectroscopy measurements A method and an apparatus for correcting nuclear measurements performed in a borehole traversing earth formation, for the effect of said borehole, wherein the formation is irradiated with high energy neutrons source and the gamma rays resulting from the c... | 01/14/1992 |
| 5068532 | Analysis using neutrons A tool suitable for borehole logging, including production oilwell borehole logging, contains a radioisotope neutron source (14), a fast neutron detector (15) and a gamma-ray detector (16). Gamma-ray detection events are selected for building spectra by c... | 11/26/1991 |
| 5055676 | Method for determining oil and water saturation in earth formation surrounding a borehole A method and an apparatus for determining the hydrocarbon saturation So in an earth formation surrounding a borehole, and/or the hydrocarbon saturation Cb in said borehole, comprising: irradiating the formation with a source of neutrons o... | 10/08/1991 |
