Methods and systems for determining fast and slow shear directions in an anisotropic formation using a logging while drilling tool
US11835673B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2021 |
| Grant date | Dec 5, 2023 |
| Priority date | — |
| Expiry date | Dec 28, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/626
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods are provided for determining properties of an anisotropic formation (including both fast and slow formations) surrounding a borehole. A logging-while-drilling tool is provided that is moveable through the borehole. The logging-while drilling tool has at least one dipole acoustic source spaced from an array of receivers. During movement of the logging-while-drilling tool, the at least one dipole acoustic source is operated to excite a time-varying pressure field in the anisotropic formation surrounding the borehole. The array of receivers is used to measure waveforms arising from the time-varying pressure field in the anisotropic formation surrounding the borehole. The waveforms are processed to determine a parameter value that represents shear directionality of the anisotropic formation surrounding the borehole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.