Reducing conductive casing effect in transient cased-hole resistivity logging
US9651705B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2012 |
| Grant date | May 16, 2017 |
| Priority date | — |
| Expiry date | Dec 5, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A first broadband magnetic field is induced at a first transmitter position in a well bore drilled through a formation. A first formation magnetic field induced by the first broadband magnetic field is detected at a first receiver position. A second formation magnetic field induced by the first broadband magnetic field is detected at a second receiver position. A second broadband magnetic field is induced at a second transmitter position in the well bore. A third formation magnetic field induced by the second broadband magnetic field is detected at the first receiver position. A fourth formation magnetic field induced by the second broadband magnetic field is detected at the second receiver position. A formation property is computed using a function of the first, second, third, and fourth formation magnetic fields, wherein the function reduces the effect of a casing on the computation of the formation property.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.