Electromagnetic logging apparatus using vertical magnetic dipole slot antennas
US4704581A · kind A · utility
51Cited by
12References
29Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 20, 1986 |
| Grant date | Nov 3, 1987 |
| Priority date | — |
| Expiry date | Jun 20, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electromagnetic logging apparatus is disclosed which utilizes vertical magnetic dipole antennas for propagation logging, preferably at a frequency greater than 100 MHz. Slot antennas having conductive probes which are perpendicular to the borehole axis, and also perpendicular to a borehole radius, are employed to obtain the desired vertical magnetic dipole antenna characteristics. The depth of investigation is improved as compared to devices of this type which employ horizontal magnetic dipole antennas. Also, the antennas are tuned in a manner which provides advantageous operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.