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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Electrical & Energy
Class Information
Number: 324/369
Name: Electricity: measuring and testing > Of geophysical surface or subsurface in situ > Using electrode arrays, circuits, structure, or supports > Coupled to artificial current source > Including separate pickup of generated fields or potentials > For well logging > While drilling
Description: Subject matter associated with a drill string so that measurements can be carried out during drilling of the borehole.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8570045 Drilling system for making LWD measurements ahead of the bit Oct. 29, 2013
8441269 Determining formation properties while drilling May. 14, 2013
8362781 Method for eliminating borehole eccentricity effect in transversal induction sensor Jan. 29, 2013
8319498 Microresistivity imaging at multiple depths of investigation Nov. 27, 2012
8305083 Calibration method for a microresistivity logging tool Nov. 6, 2012
8253417 Electrolocation apparatus and methods for mapping from a subterranean well Aug. 28, 2012
8232892 Method and system for operating a well service rig Jul. 31, 2012
8129994 Microresistivity imaging in conductive and nonconductive drilling fluid Mar. 6, 2012
8035391 Methods of logging geological formations Oct. 11, 2011
8014963 Correction of sensor non-equipotentiality in a resistivity imaging device Sep. 6, 2011
7986144 Sensor and insulation layer structure for well logging instruments Jul. 26, 2011
7782060 Integrated electrode resistivity and EM telemetry tool Aug. 24, 2010
7723989 Transducer assemblies for subsurface use May. 25, 2010
7576543 Apparatus and method for resistivity measurements during rotational drilling Aug. 18, 2009
7554329 Method and apparatus for determining formation resistivity ahead of the bit and azimuthal at the bit Jun. 30, 2009
7545145 Method and apparatus for tensorial micro-resistivity imaging in oil-based muds Jun. 9, 2009
7466136 While-drilling methodology for determining earth formation characteristics and other useful information based upon streaming potential measurements Dec. 16, 2008
7437251 Correction of sensor non-equipotentiality in a resistivity imaging device Oct. 14, 2008
7394257 Modular downhole tool system Jul. 1, 2008
7327145 Azimuthally focused electromagnetic measurement tool Feb. 5, 2008
7250768 Apparatus and method for resistivity measurements during rotational drilling Jul. 31, 2007
7172038 Well system Feb. 6, 2007
7095233 System, apparatus, and method of conducting borehole resistivity measurements Aug. 22, 2006
7091722 Method and apparatus for measuring mud resistivity Aug. 15, 2006
6975243 Downhole tubular with openings for signal passage Dec. 13, 2005
6923273 Well system Aug. 2, 2005
6885308 Logging while tripping with a modified tubular Apr. 26, 2005
6854535 Bore location system and method of calibration Feb. 15, 2005
6850068 Formation resistivity measurement sensor contained onboard a drill bit (resistivity in bit) Feb. 1, 2005
6727707 Method and apparatus for a downhole antenna Apr. 27, 2004
6600321 Apparatus and method for wellbore resistivity determination and imaging using capacitive coupling Jul. 29, 2003
6577244 Method and apparatus for downhole signal communication and measurement through a metal tubular Jun. 10, 2003
6483310 Retrievable, formation resistivity tool, having a slotted collar Nov. 19, 2002
6462561 Standoff distance variation compensator and equalizer Oct. 8, 2002
6454023 Mapping tool for tracking and/or guiding an underground boring tool Sep. 24, 2002
6396276 Apparatus and method for electric field telemetry employing component upper and lower housings in a well pipestring May. 28, 2002
6384605 Method and apparatus for measurement of borehole size and the resistivity of surrounding earth formations May. 7, 2002
6373254 Method and apparatus for controlling the effect of contact impedance on a galvanic tool in a logging-while-drilling application Apr. 16, 2002
6359438 Multi-depth focused resistivity imaging tool for logging while drilling applications Mar. 19, 2002
6288548 Method and apparatus for making electromagnetic induction measurements through a drill collar Sep. 11, 2001
6188223 Electric field borehole telemetry Feb. 13, 2001
6157195 Formation resistivity measurements from within a cased well used to quantitatively determine the amount of oil and gas present Dec. 5, 2000
6100696 Method and apparatus for directional measurement of subsurface electrical properties Aug. 8, 2000
6064210 Retrievable resistivity logging system for use in measurement while drilling May. 16, 2000
5963037 Method for generating a flow profile of a wellbore using resistivity logs Oct. 5, 1999
5904210 Apparatus and method for detecting a location and an orientation of an underground boring tool May. 18, 1999
5883516 Apparatus and method for electric field telemetry employing component upper and lower housings in a well pipestring Mar. 16, 1999
5633590 Formation resistivity measurements from within a cased well used to quantitatively determine the amount of oil and gas present May. 27, 1997
5592090 Compact, open geometry U-shaped magnet for magnetic resonance imaging Jan. 7, 1997
RE35386 Method for drilling directional wells Dec. 3, 1996

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