Borehole fracture detection using magnetic powder
US4491796A · kind A · utility
21Cited by
1References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 18, 1982 |
| Grant date | Jan 1, 1985 |
| Priority date | — |
| Expiry date | Mar 18, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for detecting fractures in a formation penetrated by a borehole wherein the fracture is first filled with a magnetic material and the formation then logged with an instrument that responds to the earth's magnetic field. The fracture can be filled with a magnetic material by including it in the drilling mud when the well is drilled and changing the mud system before logging. The logging tool can comprise a simple compass or a magnetometer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.