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| Number | Title | Issue Date |
| 7880133 | Optical multiphase flowmeter Method and apparatus enable direct measurement of at least one flow velocity for one or more phases within a multiphase fluid mixture flowing in a conduit. Some embodiments provide determination of actual individual phase flow rates for three phases (e.g., oil, wate... | 02/01/2011 |
| 7531791 | Geological tomography using cosmic rays Disclosed are a system and method configured for detecting cosmic ray muon (CRM) flux along a variety of trajectories through a subterranean test region, collecting the muon detection data, and processing the data to form a three-dimensional density distribution ima... | 05/12/2009 |
| 7488934 | Geological tomography using cosmic rays Disclosed are a system configured for detecting cosmic ray muon (CRM) flux along a variety of trajectories through a subterranean test region, collecting the muon detection data and processing the data to form a three-dimensional density distribution image correspon... | 02/10/2009 |
| 7432500 | Azimuthal binning of density and porosity data A logging-while-drilling density sensor includes a gamma ray source and at least two NaI detectors spaced apart from the source for determining measurements indicative of the formation density. A magnetometer on the drill collar measures the relative azimuth of the ... | 10/07/2008 |
| 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 |
| 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 |
| 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 |
| 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 |
| 7284605 | Apparatus and methods for reducing stand-off effects of a downhole tool A method for reducing stand-off effects of a downhole tool includes disposing the downhole tool in a borehole, wherein the downhole tool comprises at least one moveable section disposed between an energy source and a receiver on the downhole tool; and activating the... | 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 |
| 7230543 | Downhole clock synchronization apparatus and methods for use in a borehole drilling environment Geophysical measurement system employed during the drilling of a well borehole. The system employs a reference clock disposed within equipment at the surface of the earth and a borehole assembly which houses a downhole clock and at least one sensor. The borehole ass... | 06/12/2007 |
| 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 |
| 7214942 | Gamma ray detectors having improved signal-to-noise ratio and related systems and methods for analyzing bulk materials An assembly for detecting gamma rays from a bulk material defines a radiation region. A radiation source is positioned adjacent the radiation region and configured to irradiate the bulk material in the radiation region. A first gamma ray detector is positioned adjac... | 05/08/2007 |
| 7204308 | Borehole marking devices and methods To reduce the surveying error in a wellbore, the creation of several reference points within a borehole is carried out by physically placing borehole markers in the borehole casing, the borehole wall or in the formation itself, and providing an accurate reference of... | 04/17/2007 |
| 7206376 | Fluid density measurement A wellbore tool for measuring the density of a fluid flowing in a wellbore by a photon attenuation technique includes a tube defining a flow path for the fluid, a photon source at one end of the tube, and a photon detector arranged to receive photons which have pass... | 04/17/2007 |
| 7186971 | 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... | 03/06/2007 |
| 7151254 | Logging tool with response invariant to changes in borehole pressure A logging system for measuring parameters of earth formation penetrated by a well borehole. Measurements made with the system are not adversely affected by varying pressure encountered a borehole environment. This is accomplished by the use of a main compensation el... | 12/19/2006 |
| 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 |
| 7129477 | Method of processing data from a dual detector LWD density logging instrument coupled with an acoustic standoff measurement A logging-while-drilling density sensor includes a gamma ray source and at least two NaI detectors spaced apart from the source for determining measurements indicative of the formation density. An acoustic caliper is used for making standoff measurements of the NaI ... | 10/31/2006 |
| 7075062 | Apparatus and methods for downhole determination of characteristics of formation fluids An oil sample is subjected to nuclear electromagnetic irradiation downhole, and the electron and/or mass density of the oil sample is determined by measuring the attenuation of the irradiation and relating the attenuation to the electron density. If the irradiation ... | 07/11/2006 |
| 7073378 | 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... | 07/11/2006 |
| 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 |
| 6975112 | Systems and methods of determining motion tool parameters in borehole logging A system and method for calculating the lateral velocity of a rotating drilling tool within a borehole, the system comprising: a pair of accelerometers placed oppositely across the drilling tool axis of rotation and two magnetometers. The method comprises: reading t... | 12/13/2005 |
| 6962466 | Soil remediation of mercury contamination An in situ soil remediation system may be used to remove or reduce levels of mercury contamination within soil. The soil remediation system may also remove or reduce levels of other contaminants within the soil. Mercury may be vaporized within the soil by a heating ... | 11/08/2005 |
| 6956371 | Method and apparatus for detecting diffusion sensitive phases with estimation of residual error in NMR logs A method and system are disclosed for NMR echo-train data acquisition and processing for enhanced tracking of the error in the signal due to magnetoacoustic effects, known as ringing, that are not cancelled out or otherwise corrected. In one aspect, the method enabl... | 10/18/2005 |
| 6944548 | Formation evaluation through azimuthal measurements A method for formation logging includes acquiring measurements of neutron-induced signals having azimuthal information using a neutron tool; processing the measurements into a plurality of azimuthal sector data for each acquisition interval; and deriving a selected ... | 09/13/2005 |
| 6915685 | Tool holder for measurement means The invention relates to a tool holder serving to receive measurement means (9, 10, 13) for characterizing a multi-phase fluid coming from a deposit (17) through which at least one well (16) passes, and flowing inside said tool holder. According... | 07/12/2005 |
| 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 |
| 6815665 | 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 the radiat... | 11/09/2004 |
| 6781115 | Subsurface radiation phenomena detection with combined and azimuthally sensitive detectors A system and method are disclosed for detecting radiation phenomena in an area surrounding a wellbore traversing an earth formation. A logging instrument is equipped with combined radiation detectors to provide multiple measurements at the same axial position along ... | 08/24/2004 |
| 6747270 | Method and apparatuses for logging hydrocarbon reservoirs A method, of logging a borehole, for use in a cased oil well for detecting the gas/oil or water/oil contact in a hydrocarbon reservoir, using a neutron capture technique to detect one or more properties of fluid includes comparing the count rates from two or more ra... | 06/08/2004 |
| 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 |
| 6696362 | Method for using an in situ particle sensor for monitoring particle performance in plasma deposition processes Methods are provided for identifying root causes of particle issues and for developing particle-robust process recipes in plasma deposition processes. The presence of in situ particles within the substrate processing system is detected over a period of ti... | 02/24/2004 |
| 6552334 | Wellbore caliper measurement method using measurements from a gamma-gamma density Methods are disclosed for determining the standoff of a well logging instrument from the wall of a wellbore and the shape of the wellbore itself. The methods include measuring a compensated gamma-gamma formation density at a rotary orientation proximate a... | 04/22/2003 |
| 6408110 | Tiled imaging apparatus providing substantially continuous imaging An imaging apparatus includes a plurality of imaging device tiles arranged on an imaging support. Each of the imaging device tiles includes an imaging device having an imaging surface and a non-active region, wherein the imaging surface of a first imaging... | 06/18/2002 |
| 6215120 | Method for determining symmetry and direction properties of azimuthal gamma ray distributions A method for determining the azimuthal direction of a maximum in a series of gamma ray count measurements that are each assigned to an azimuthal sector, comprising: determining the x- and y-components of the gamma ray counts for each sector, averaging the... | 04/10/2001 |
| 5909772 | Apparatus and method for estimating liquid yield of a gas/condensate reservoir Apparatus and method for determining a liquid yield from a gas/condensate reservoir. The apparatus and method first determines the porosity at each depth of a reservoir, using open hole logging techniques, before the well within the reservoir is used for ... | 06/08/1999 |
