Downhole nonlinear acoustics measurements in rock formations using dynamic acoustic elasticity and time reversal
US11029435B2 · kind B2 · utility
1Cited by
4References
21Claims
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Key dates
| Filing date | Oct 24, 2017 |
| Grant date | Jun 8, 2021 |
| Priority date | — |
| Expiry date | Feb 27, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/6248
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus and methods for measurement of pore pressure in rock formations through an open, or cemented and/or cased, borehole are described. Such measurements are achieved using the Dynamic Acoustic Elasticity (DAE) method for characterizing nonlinear parameters by perturbing a selected rock formation volume with a High Amplitude, Low Frequency (HALF) acoustic strain wave, and probing this volume using a Low Amplitude, High Frequency (LAHF) acoustic wave. Time reversal techniques may be employed for focusing acoustic energy Into the formation in the vicinity of the pipe or open hole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.