Logging while drilling tool for obtaining azimuthally sensitive formation resistivity measurements
US7557582B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 24, 2008 |
| Grant date | Jul 7, 2009 |
| Priority date | — |
| Expiry date | Jul 24, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for making azimuthally sensitive resistivity measurements of a subterranean formation is disclosed. The apparatus includes a magnetically permeably ring deployed about an electrically conductive tool body. An AC voltage supply is coupled to the tool body on opposing sides of the magnetically permeable ring, with at least one connecting conductor crossing outside the ring. Exemplary embodiments of this invention may further include one or more current sensing electrodes deployed in and electrically isolated from an outer surface of a blade deployed on the tool body and may be utilized to make azimuthally resolved formation resistivity measurements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.