Flexural wave measurement for thick casings
US11473419B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 2018 |
| Grant date | Oct 18, 2022 |
| Priority date | — |
| Expiry date | Jan 5, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/2636
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Systems and methods are provided for obtaining a flexural-attenuation measurement for cement evaluation that may be effective even for wells with relatively thick casings. A method includes emitting an acoustic signal at a casing in a well that excites the casing into generating an acoustic response signal containing acoustic waves, such as Lamb waves. The Lamb waves include flexural waves and extensional waves. The casing may be relatively large, having a thickness of at least 16 mm. The acoustic response signal may be detected and filtered to reduce a relative contribution of the extensional waves. This may correspondingly increase a relative contribution of the flexural waves. The filtered acoustic response signal may be used as a flexural-attenuation measurement for cement evaluation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.