High resolution array induction tool
US6597993B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 2002 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Nov 5, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A coil array for high resolution induction logging comprises a transmitter, a first receiver set and a second receiver set. The second receiver set includes at least one portion of the first receiver set. A method for deriving an apparent conductivity log from at least one induction well log that comprises a plurality of depth samples, comprises raising each depth sample to several predetermined powers, convolving in depth the powers of conductivity, and summing the convolutions to produce a conductivity log. An apparatus for measuring the resistivity of an earth formation, comprises a transmitter energized by a time-varying, periodic voltage, a set of receivers generating a receiver voltage, an analog-to-digital converter that outputs a digitized voltage signal, and a processor that receives the digitized voltage signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.