Magnetometers for measurement-while-drilling applications
US7252144B2 · kind B2 · utility
7Cited by
11References
39Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2004 |
| Grant date | Aug 7, 2007 |
| Priority date | — |
| Expiry date | Sep 13, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L63/102
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A nuclear sensor on a bottomhole assembly (BHA) makes measurements of a property of an earth formation during continued rotation of the BHA. Magnetometers that are susceptible to bias error are deployed on the BHA to make measurements of the magnetic toolface angle. A processor separates the sensor measurements into azimuthal sectors while compensating for inherent time delays in the electronics, non-uniform rotation, and bias.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.