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Class Information
Number: 324/346
Name: Electricity: measuring and testing > Of geophysical surface or subsurface in situ > By magnetic means > Within a borehole
Description: Subject matter adapted for use within a drill hole in the earth.

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8646520 Precision marking of subsurface locations Feb. 11, 2014
8638103 Electromagnetic logging between borehole and surface Jan. 28, 2014
8633702 Apparatus and method for actively balancing impedance of a resistivity measuring tool Jan. 21, 2014
8618803 Well location determination apparatus, methods, and systems Dec. 31, 2013
8604796 Steerable magnetic dipole antenna for measurement-while-drilling applications Dec. 10, 2013
8593140 Formation testing and evaluation using localized injection Nov. 26, 2013
8567449 Systems and methods for locating and restoring service lines in pipeline rehabilitation Oct. 29, 2013
8497685 Angular position sensor for a downhole tool Jul. 30, 2013
8490717 Downhole magnetic measurement while rotating and methods of use Jul. 23, 2013
8487626 Downhole sensor assembly and method of using same Jul. 16, 2013
8473211 Methods of correcting accelerometer and magnetometer measurements Jun. 25, 2013
8471563 Steerable magnetic dipole antenna for measurement while drilling applications Jun. 25, 2013
8471562 Multi-axial antenna and method for use in downhole tools Jun. 25, 2013
8456166 Single-well through casing induction logging tool Jun. 4, 2013
8362782 Resonance method for measuring water-oil ratio, conductivity, porosity, permeability and electrokinetic constant in porous formations Jan. 29, 2013
8362781 Method for eliminating borehole eccentricity effect in transversal induction sensor Jan. 29, 2013
8294468 Method and apparatus for well-bore proximity measurement while drilling Oct. 23, 2012
8289024 Method and apparatus for locating well casings from an adjacent wellbore Oct. 16, 2012
8278928 Apparatus and method for detection of position of a component in an earth formation Oct. 2, 2012
8269501 Methods for magnetic imaging of geological structures Sep. 18, 2012
8264229 Electromagnetic geological metrology system Sep. 11, 2012
8180571 Wellbore surveying May. 15, 2012
8072347 Method and apparatus for locating faults in wired drill pipe Dec. 6, 2011
8063641 Magnetic ranging and controlled earth borehole drilling Nov. 22, 2011
8026722 Method of magnetizing casing string tubulars for enhanced passive ranging Sep. 27, 2011
8008919 Method for compensating drill pipe and near-borehole effect on and electronic noise in transient resistivity measurements Aug. 30, 2011
7990153 Compensated directional resistivity measurements Aug. 2, 2011
7969150 Demagnetizer to eliminate residual magnetization of wellbore wall produced by nuclear magnetic resonance logs Jun. 28, 2011
7958949 Method and apparatus for three dimensional geosteering Jun. 14, 2011
7822562 Removing air wave noise from electromagnetic survey data Oct. 26, 2010
7816923 Enhanced passive ranging methodology for well twinning Oct. 19, 2010
7816922 Magnetization of target well casing string tubulars for enhanced passive ranging Oct. 19, 2010
7812610 Method and apparatus for locating well casings from an adjacent wellbore Oct. 12, 2010
7768275 Method and apparatus for characterising a three phase transformer using a single phase power supply Aug. 3, 2010
7759942 Lightweight, low cost structure for formation conductivity measuring instrument Jul. 20, 2010
7679480 Method for magnetizing casing string tubulars Mar. 16, 2010
7663373 Determining beacon location using magnetic field ratios Feb. 16, 2010
7656161 Magnetization of target well casing strings tubulars for enhanced passive ranging Feb. 2, 2010
7599797 Method of mitigating risk of well collision in a field Oct. 6, 2009
7510030 Elongated cross coil assembly for use in borehole location determination Mar. 31, 2009
7414405 Measurement tool for obtaining tool face on a rotating drill collar Aug. 19, 2008
7403013 Boring tool tracking/guiding system and method with unconstrained target location geometry Jul. 22, 2008
7385400 Azimuthally sensitive receiver array for an electromagnetic measurement tool Jun. 10, 2008
7377333 Linear position sensor for downhole tools and method of use May. 27, 2008
7235970 Antenna core material for use in MWD resistivity measurements and NMR measurements Jun. 26, 2007
7219749 Single solenoid guide system May. 22, 2007
7091722 Method and apparatus for measuring mud resistivity Aug. 15, 2006
7053622 Measuring equipment and method for mapping the geology in an underground formation May. 30, 2006
7031839 Multi-frequency focusing for MWD resistivity tools Apr. 18, 2006
7026820 Method and apparatus for minimizing direct coupling for downhole logging devices Apr. 11, 2006

1 2 3 4

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