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| Number | Title | Issue Date |
| 8106659 | In situ measurements in formation testing to determine true formation resistivity A borehole formation testing system that measures resistivity of near borehole formation in situ rather than the measuring resistivity of fluid drawn into a formation tester tool. A radially extendable probe assembly contacts and forms a hydraulic seal with the wall... | 01/31/2012 |
| 7380598 | Method for detecting fluid leakage from a subterranean formation A method for the detection of a fluid leak from a plugged well extending from a surface of the earth to penetrate a subterranean formation which contains fluid by logging a collection chamber positioned in the plugged well. ... | 06/03/2008 |
| 7357030 | Apparatus and methods for determining at least one characteristic of a proximate environment Methods and an apparatus for determining at least one characteristic of an environment are disclosed. A vibrational energy may be imparted into an environment and a magnitude of damping of the vibrational energy may be measured and at least one characteristic of the... | 04/15/2008 |
| 7129704 | System for monitoring salinity in a water well A well (10) for producing water is characterized in that it includes a network of widely spaced electrodes (8) electrically coupled with measurement means (3) or with electric current generation means (1). By utilizing a measurement resul... | 10/31/2006 |
| 6937018 | Systems and methods for fabricating pole pieces for magnetic resonance imaging systems An imaging system including at least one pole piece is described. The at least one pole piece includes at least two grain-oriented sheets that are stacked together, where a direction of easy magnetization of a first of the at least two grain-oriented sheets is diffe... | 08/30/2005 |
| 6909283 | Method and system to regulate cooling of a medical imaging device The present invention provides a system and method of removing heat from an MR imaging device while maintaining internal and external temperatures below maximum operating limits, thereby enabling higher power applications for faster imaging with improved image quali... | 06/21/2005 |
| 6012017 | Interpreting formation tops Formation tops correlation is interpreted between sampled log curves by a weighted combination of covariance, the ratio of standard deviation, and the ratio of summed amplitude. This covariance function is computed and evaluated appropriately for the geol... | 01/04/2000 |
| 5767680 | Method for sensing and estimating the shape and location of oil-water interfaces in a well Inception of hydrocarbon extraction from a reservoir causes the oil-water interface to warp and cusp toward the extraction gates along a well. This invention proposes time-lapse DC/AC measurements with an array of permanently deployed sensors in order to ... | 06/16/1998 |
| 5214384 | Method including electrical self potential measurements for detecting multiphase flow in a cased hole A method for time lapse electric logging in a cased hole in which electrodes are implanted in the casing or the hole is completed with a gravel packed non conductive, perforated liner that allows an open hole logging tool to be used for time-lapse logging... | 05/25/1993 |
| 5151658 | Three-dimensional detection system for detecting fractures and their distributions in the earth crust utilizing an artificial magnetic field and magnetic particle tracer A three-dimensional detection system for detecting fractures and their distributions in the earth crust utilizing an artificial magnetic field which comprises: a magnetic particle tracer being injected into the fractures of the earth crust, having high ma... | 09/29/1992 |
| 4980642 | Detection of influx of fluids invading a borehole The present invention is directed to a system, apparatus and methods for determining influx of formation fluids into a well borehole during drilling. The methods of the present invention comprise determining the dielectric constant and/or conductivity of ... | 12/25/1990 |
| 4802143 | Alarm system for measurement while drilling oil wells A detector for use in wells comprises a collar member connected to a drill string at a position down-well with respect to the surface of the earth, a sensor in the collar in the area being monitored for sensing down-well fluids in deep wells, an impulse g... | 01/31/1989 |
