Time-reversed nonlinear acoustics for downhole pressure measurements
US11079505B2 · kind B2 · utility
1Cited by
14References
17Claims
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Key dates
| Filing date | Mar 9, 2017 |
| Grant date | Aug 3, 2021 |
| Priority date | — |
| Expiry date | Dec 19, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/63
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus (10) and methods for combining time reversal and elastic nonlinearity of formation materials for qualtitatively probing for over-pressured regions down hole in advance of a well drilling bit, to determine the distance to the over-pressured region, and for accurately measuring pore pressure downhole in a formation, are described. Classical and reciprocal time reversal methods may be utilized to achieve these measurements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.