Azimuthally sensitive receiver array for an electromagnetic measurement tool
US7385400B2 · kind B2 · utility
17Cited by
23References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 1, 2005 |
| Grant date | Jun 10, 2008 |
| Priority date | — |
| Expiry date | Mar 30, 2026 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/002
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An azimuthally sensitive logging while drilling tool is disclosed. The tool may be suitable, for example, to measure azimuthal variations of electrical properties of a subterranean formation. The tool includes at least one transmitter disposed to transmit electromagnetic energy and a longitudinally spaced receiver array. The receiver array includes a plurality of discrete magnetic field sensors deployed about a circumference of the tool body. In one exemplary embodiment, the tool includes six or more magnetic field sensors selected from either giant magnetoresistive sensors or anisotropic magnetoresistive sensors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.