Electrical log processing near casing point
US10928543B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2014 |
| Grant date | Feb 23, 2021 |
| Priority date | — |
| Expiry date | May 26, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/542
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus and techniques are described, such as for obtaining information indicative of a formation resistivity near a casing, such as using an array laterolog apparatus. For example, raw measurements received from a well tool in a borehole near a casing may indicate a resistivity of a geologic formation through which the borehole extends. Any errors or interference in the raw measurements caused by the proximity of the well tool to the casing may be removed to eliminate the casing effect on the raw measurements. In some examples, a signal and formation libraries that include casing specific parameters may be used in conjunction with non-casing optimized signal and formation libraries to perform correction mapping of raw measurements. The corrections and their application to the raw measurements may be based on the position of a well logging tool with respect to a casing termination point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.