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Class Information
Number: 324/338
Name: Electricity: measuring and testing > Of geophysical surface or subsurface in situ > With radiant energy or nonconductive-type transmitter > With separate pickup > Within a borehole
Description: Subject matter adapted for use within a drill hole in the earth.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7626393 |
Apparatus and method for measuring movement of a downhole tool |
Dec. 1, 2009 |
| 7619540 |
Apparatus and methods for determining isotropic and anisotropic formation resistivity in the presence of invasion |
Nov. 17, 2009 |
| 7609065 |
System and method for locating an anomaly |
Oct. 27, 2009 |
| 7595636 |
Apparatus and method of using accelerometer measurements for casing evaluation |
Sep. 29, 2009 |
| 7586307 |
Locating arrangement and method using boring tool and cable locating signals |
Sep. 8, 2009 |
| 7583085 |
Downhole sensor assembly |
Sep. 1, 2009 |
| 7579840 |
Broadband resistivity interpretation |
Aug. 25, 2009 |
| 7576543 |
Apparatus and method for resistivity measurements during rotational drilling |
Aug. 18, 2009 |
| 7567869 |
Induction tool for detail evaluation of near borehole zone |
Jul. 28, 2009 |
| 7557582 |
Logging while drilling tool for obtaining azimuthally sensitive formation resistivity measurements |
Jul. 7, 2009 |
| 7557581 |
Method for imaging subterranean formations |
Jul. 7, 2009 |
| 7538555 |
System and method for locating an anomaly ahead of a drill bit |
May. 26, 2009 |
| 7536261 |
Anti-symmetrized electromagnetic measurements |
May. 19, 2009 |
| 7501829 |
Extra bucking coils as an alternative way to balance induction arrays |
Mar. 10, 2009 |
| 7495446 |
Formation evaluation system and method |
Feb. 24, 2009 |
| 7482812 |
Series-resonant tuning of an LWD receiver |
Jan. 27, 2009 |
| 7477160 |
Wireless communications associated with a wellbore |
Jan. 13, 2009 |
| 7477161 |
Bidirectional telemetry apparatus and methods for wellbore operations |
Jan. 13, 2009 |
| 7474101 |
Method for combined transient and frequency domain electromagnetic measurements |
Jan. 6, 2009 |
| 7450053 |
Logging device with down-hole transceiver for operation in extreme temperatures |
Nov. 11, 2008 |
| 7436183 |
Replaceable antennas for wellbore apparatus |
Oct. 14, 2008 |
| 7436184 |
Well logging apparatus for obtaining azimuthally sensitive formation resistivity measurements |
Oct. 14, 2008 |
| 7437251 |
Correction of sensor non-equipotentiality in a resistivity imaging device |
Oct. 14, 2008 |
| 7425830 |
System and method for locating an anomaly |
Sep. 16, 2008 |
| 7425831 |
System and method for locating an anomaly |
Sep. 16, 2008 |
| 7420367 |
High-frequency induction imager with concentric coils for MWD and wireline applications |
Sep. 2, 2008 |
| 7417436 |
Selectable tap induction coil |
Aug. 26, 2008 |
| 7414407 |
Method and apparatus for directional resistivity measurement while drilling |
Aug. 19, 2008 |
| 7414406 |
System and method for locating an anomaly |
Aug. 19, 2008 |
| 7414405 |
Measurement tool for obtaining tool face on a rotating drill collar |
Aug. 19, 2008 |
| 7403000 |
Apparatus and method of determining casing thickness and permeability |
Jul. 22, 2008 |
| 7403013 |
Boring tool tracking/guiding system and method with unconstrained target location geometry |
Jul. 22, 2008 |
| 7391216 |
Locating arrangement and method using boring tool and cable locating signals |
Jun. 24, 2008 |
| 7388379 |
Series-resonant tuning of a downhole loop antenna |
Jun. 17, 2008 |
| 7385400 |
Azimuthally sensitive receiver array for an electromagnetic measurement tool |
Jun. 10, 2008 |
| 7382135 |
Directional electromagnetic wave resistivity apparatus and method |
Jun. 3, 2008 |
| 7363159 |
Method of determining resistivity and/or dielectric values of an earth formation as a function of position within the earth formation |
Apr. 22, 2008 |
| 7347271 |
Wireless communications associated with a wellbore |
Mar. 25, 2008 |
| 7345487 |
Method and system of controlling drilling direction using directionally sensitive resistivity readings |
Mar. 18, 2008 |
| 7336080 |
Method and apparatus for use of the real component of a magnetic field of multicomponent resistivity measurements |
Feb. 26, 2008 |
| 7327145 |
Azimuthally focused electromagnetic measurement tool |
Feb. 5, 2008 |
| 7307425 |
Receiver electronics proximate antenna |
Dec. 11, 2007 |
| 7282704 |
Method for determining formation porosity and gas saturation in a gas reservoir |
Oct. 16, 2007 |
| 7268555 |
Correction of cross-component induction measurements for misalignment using comparison of the XY formation response |
Sep. 11, 2007 |
| 7259564 |
Method and device for determining the position of an interface in relation to a bore hole |
Aug. 21, 2007 |
| 7250768 |
Apparatus and method for resistivity measurements during rotational drilling |
Jul. 31, 2007 |
| 7235970 |
Antenna core material for use in MWD resistivity measurements and NMR measurements |
Jun. 26, 2007 |
| 7228903 |
Apparatus and method for wireline imaging in nonconductive muds |
Jun. 12, 2007 |
| 7227363 |
Determining formation anisotropy based in part on lateral current flow measurements |
Jun. 5, 2007 |
| 7209093 |
Locating technique and apparatus using an approximated dipole signal |
Apr. 24, 2007 |
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