Well logging apparatus and method using two spaced apart transmitters with two receivers located between the transmitters
US4968940A · kind A · utility
75Cited by
19References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1989 |
| Grant date | Nov 6, 1990 |
| Priority date | — |
| Expiry date | Jun 20, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Well logging techniques and apparatus are disclosed for determining formation resistivity at different radial depths of investigation and with greater accuracy than prior techniques, for determining the existence, locations and properties of beds and caves, and for determining changes in the size of a borehole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.