Downhole tri-axial induction electromagnetic tool
US10830039B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 2014 |
| Grant date | Nov 10, 2020 |
| Priority date | — |
| Expiry date | May 7, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus and methods for estimating a value of a resistivity property of an earth formation intersected by a borehole. Apparatus may include a carrier conveyable in the borehole; a tri-axial induction antenna assembly along the carrier; and a magnetically transparent sleeve enclosing the antenna assembly. The antenna assembly includes panels circumferentially arrayed about a portion of the carrier to form at least three collocated antennas. Each panel includes a magnetic core, an axially sensing coil that is transversely wound about the magnetic core, and a laterally sensing coil that is longitudinally wound about the magnetic core. The axially sensing coil of each panel may be electrically connected to the axially sensing coils of the other panels to form an axial antenna. Corresponding lateral coils may be electrically connected to form a lateral antenna. Each panel may be individually removable from the carrier, and assembled together may form a cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.