Subsurface electromagnetic measurements using cross-magnetic dipoles
US7239145B2 · kind B2 · utility
19Cited by
23References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2004 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Mar 29, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Sensor assemblies including transmitter and receiver antennas to respectively transmit or receive electromagnetic energy. The sensor assemblies are disposed in downhole tools adapted for subsurface disposal. The receiver is disposed at a distance less than six inches (15 cm) from the transmitter on the sensor body. The sensor transmitter or receiver includes an antenna with its axis tilted with respect to the axis of the downhole tool. A sensor includes a tri-axial system of antennas. Another sensor includes a cross-dipole antenna system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.