Shielded apparatus for reducing an electrical field generated by a pad during electrically exploring geological formations
US7382136B2 · kind B2 · utility
7Cited by
8References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 2, 2004 |
| Grant date | Jun 3, 2008 |
| Priority date | — |
| Expiry date | Jul 27, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for investigating the wall of a borehole in a geological formation. The pad having shielding means which are arranged between a source electrode and a set of measurement electrodes and between the measurement electrodes and a return electrode. The shielding means being flush with or almost flush with the outside face of the pad and extending along the length of the outside face of the pad so that the electric field generated by the current and return electrodes is substantially eliminated in the pad and in the vicinity of the measurement electrodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.