Electromagnetic formation evaluation tool
US5138263A · kind A · utility
57Cited by
5References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 16, 1991 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Jan 16, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tool for evaluating electrical properties of an earth formation surrounding a borehole while drilling the borehole is disclosed. The tool includes a housing for connecting upper and lower portions of a drillstring, a transmit antenna for generating electromagnetic waves at least two receiving antennas for receiving electromagnetic waves and magnetic elements associated with each of the antennas for electromagnetically coupling each of the antennas with the formation. The tool provides improved transmit efficiency and improved receiving sensitivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.