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Class Information
Number: 324/372
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 > Between spaced boreholes
Description: Subject matter in which electrode means are lowered within two or more drill holes in the earth for investigating the formations between the boreholes.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7095232 |
Determination of borehole geometry inside cased wells with crosswell electromagnetics |
Aug. 22, 2006 |
| 7049821 |
Determination of borehole geometry inside cased wells with crosswell electromagnetics |
May. 23, 2006 |
| 6731114 |
Apparatus with capacitive electrodes for measuring subsurface electrical characteristics in the subsoil |
May. 4, 2004 |
| 6147497 |
Using electrical impedance tomography to map subsurface hydraulic conductivity |
Nov. 14, 2000 |
| 5187440 |
Measuring resistivity changes from within a first cased well to monitor fluids injected into oil bearing geological formations from a second cased well while passing electrical current between |
Feb. 16, 1993 |
| 4901023 |
Methods and apparatus for measurement of low frequency a.c. magnetic fields within cased boreholes to determine properties of geological formations |
Feb. 13, 1990 |
| 4875015 |
Multi-array borehole resistivity and induced polarization method with mathematical inversion of redundant data |
Oct. 17, 1989 |
| 4755944 |
Method for obtaining dielectric constant and conductivity information on subsoil structure using continuous complex geotomography |
Jul. 5, 1988 |
| 4281289 |
Method of determining interwell oil field fluid saturation distribution |
Jul. 28, 1981 |
| 4253063 |
Impedance measuring method of and apparatus for detecting escaping leach solution |
Feb. 24, 1981 |
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