Methods for characterizing multi-string cased wells using wide frequency bandwidth signals
US11131182B2 · kind B2 · utility
2Cited by
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20Claims
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Key dates
| Filing date | Mar 27, 2018 |
| Grant date | Sep 28, 2021 |
| Priority date | — |
| Expiry date | Oct 1, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/6169
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods are provided for estimating a quality of cement in the annuli of a multi-string wellbore. Wideband acoustic energy signals are generated and detected in the wellbore and are processed to obtain indications of wideband casing-formation phase slowness dispersions in the wellbore. The indications are compared to reference wideband model casing-formation phase slowness dispersions in order to estimate status of cement or lack of cement in the annuli at that location based on the results of the comparison.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.