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Class Information
Number: 324/366
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
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 |
| 7579841 |
Standoff compensation for imaging in oil-based muds |
Aug. 25, 2009 |
| 7545145 |
Method and apparatus for tensorial micro-resistivity imaging in oil-based muds |
Jun. 9, 2009 |
| 7474101 |
Method for combined transient and frequency domain electromagnetic measurements |
Jan. 6, 2009 |
| 7466136 |
While-drilling methodology for determining earth formation characteristics and other useful information based upon streaming potential measurements |
Dec. 16, 2008 |
| 7388380 |
While-drilling apparatus for measuring streaming potentials and determining earth formation characteristics and other useful information |
Jun. 17, 2008 |
| 7150188 |
Non-invasive measurement of fluid-pressure diffusivity using electro-osmosis |
Dec. 19, 2006 |
| 7071697 |
Centralizer including measurement means |
Jul. 4, 2006 |
| 7042225 |
Apparatus and methods for induction-SFL logging |
May. 9, 2006 |
| 7027967 |
Method and system for indicating anisotropic resistivity in an earth formation |
Apr. 11, 2006 |
| 7026820 |
Method and apparatus for minimizing direct coupling for downhole logging devices |
Apr. 11, 2006 |
| 6927578 |
Detection of borehole currents due to a decentered transverse magnetic dipole transmitter |
Aug. 9, 2005 |
| 6919724 |
Method and apparatus for investigating the wall of a borehole |
Jul. 19, 2005 |
| 6906535 |
Method for characterizing water-in-oil emulsions using electrical wave forms |
Jun. 14, 2005 |
| 6839000 |
Integrated, single collar measurement while drilling tool |
Jan. 4, 2005 |
| 6765387 |
System and method for measuring resistivity through casing |
Jul. 20, 2004 |
| 6670813 |
Integrated borehole system for reservoir detection and monitoring |
Dec. 30, 2003 |
| 6591673 |
Methods for identifying fluid types of underground formations |
Jul. 15, 2003 |
| 6542100 |
Apparatus and method for filtering a signal which represents a digital data stream |
Apr. 1, 2003 |
| 6541975 |
Integrated borehole system for reservoir detection and monitoring |
Apr. 1, 2003 |
| 6396276 |
Apparatus and method for electric field telemetry employing component upper and lower housings in a well pipestring |
May. 28, 2002 |
| 6353322 |
Method for automatically calibrating resistivity well logs for effects of change in wellbore diameter and circuit drift |
Mar. 5, 2002 |
| 6211679 |
Method of compensating laterlog measurements for perturbation of survey voltage by cable armor voltage |
Apr. 3, 2001 |
| 6188223 |
Electric field borehole telemetry |
Feb. 13, 2001 |
| 6147497 |
Using electrical impedance tomography to map subsurface hydraulic conductivity |
Nov. 14, 2000 |
| 6114972 |
Electromagnetic resistivity tool and method for use of same |
Sep. 5, 2000 |
| 6064210 |
Retrievable resistivity logging system for use in measurement while drilling |
May. 16, 2000 |
| 6060886 |
Radial sounding electrical well logging instrument |
May. 9, 2000 |
| 6060885 |
Method and apparatus for determining the resistivity and conductivity of geological formations surrounding a borehole |
May. 9, 2000 |
| 6023168 |
Apparatus and method for measuring the resistivity of underground formations |
Feb. 8, 2000 |
| 6008645 |
Prediction of permeability from capillary pressure curves derived from nuclear magnetic resonance pore size distributions |
Dec. 28, 1999 |
| 6006831 |
Electrical well logging fluid and method of using same |
Dec. 28, 1999 |
| 5883515 |
Method of determining formation resistivity utilizing combined measurements of inductive and galvanic logging instruments |
Mar. 16, 1999 |
| 5883516 |
Apparatus and method for electric field telemetry employing component upper and lower housings in a well pipestring |
Mar. 16, 1999 |
| 5852363 |
Methods and apparatus for measuring characteristics of a formation around a borehole using computed focusing |
Dec. 22, 1998 |
| 5754050 |
Method and apparatus for measuring geometrical characteristics of a well, in particular a hydrocarbon well |
May. 19, 1998 |
| 5721492 |
Electrical logging sensor having conductive and insulating portions formed by layer deposition of hard materials and its method of manufacture |
Feb. 24, 1998 |
| 5502686 |
Method and apparatus for imaging a borehole sidewall |
Mar. 26, 1996 |
| 5463320 |
Apparatus and method for determining the resitivity of underground formations surrounding a borehole |
Oct. 31, 1995 |
| 5463549 |
Method and apparatus for determining permeability of subsurface formations |
Oct. 31, 1995 |
| 5442294 |
Conductivity method and apparatus for measuring strata resistivity adjacent a borehole |
Aug. 15, 1995 |
| 5426368 |
Logging method and apparatus for investigating geometrical characteristics of a borehole and for investigating formation resistivity |
Jun. 20, 1995 |
| 5402069 |
Spontaneous potential measurement apparatus connected between metallic housings of a wellbore apparatus for measuring the spontaneous potential of an earth formation |
Mar. 28, 1995 |
| 5343153 |
Well logging method and apparatus using passive azimuthal electrodes |
Aug. 30, 1994 |
| 5339037 |
Apparatus and method for determining the resistivity of earth formations |
Aug. 16, 1994 |
| 5260662 |
Conductivity method and apparatus for measuring strata resistivity adjacent a borehole |
Nov. 9, 1993 |
| 5255245 |
Total field imaging probe |
Oct. 19, 1993 |
| 5218301 |
Method and apparatus for determining distance for magnetic and electric field measurements |
Jun. 8, 1993 |
| 5038108 |
Determing parameters of a geological environment |
Aug. 6, 1991 |
| 5012193 |
Method and apparatus for filtering data signals produced by exploration of earth formations |
Apr. 30, 1991 |
| 4990853 |
Protective device permitting more specially the use of probe in large diameter wells |
Feb. 5, 1991 |
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