Quadrupole acoustic shear wave logging while drilling
US7257489B2 · kind B2 · utility
11Cited by
31References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2002 |
| Grant date | Aug 14, 2007 |
| Priority date | — |
| Expiry date | Mar 7, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/52
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tool generates signals indicative a shear wave slowness of the formation surrounding a borehole. The tool comprises a collar portion adapted for mounting in a drill string, a quadrupole sonic transmitter mounted to the collar portion, and a quadrupole sonic receiver array mounted to the collar spaced apart from the transmitter. A method determines shear wave slowness of the formation. The method includes propagating quadrupole wave energy into the formation and detecting quadrupole dispersive waveform received at a second location. Formation shear wave slowness is calculated using dispersive slowness time coherence processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.