System for the measurement of electrical characteristics of geological formations from within steel cased wells using magnetic circuits
US6445187B1 · kind B1 · utility
11Cited by
83References
3Claims
0Family size
Inventors
Key dates
| Filing date | Apr 10, 2000 |
| Grant date | Sep 3, 2002 |
| Priority date | — |
| Expiry date | Apr 10, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for measuring magnetic fields outside a ferromagnetic container from inside the same container is described. The invention uses magneti circuits to direct the flow of magnetic flux to a magnetic field detector. By using magnetic fields for detection, this invention is able to measure the properties of magnetic materials outside the ferromagnetic container, such as a geologic formation, electric or magnetic parameters, or log well and drill holes that have been cased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.