Formation measurements using flexural modes of guided waves
US9389330B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 2014 |
| Grant date | Jul 12, 2016 |
| Priority date | — |
| Expiry date | Jan 13, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/6242
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An embodiment of a method of estimating a property of an earth formation includes: disposing an acoustic tool in a borehole in an earth formation, the acoustic tool including an acoustic source and an acoustic receiver, the borehole having an axial direction; transmitting an acoustic signal into the borehole by the acoustic source, the acoustic signal having a selected frequency and transmitted at a propagation angle relative to the axial direction, the propagation angle selected to excite a desired guided flexural wave mode that propagates along a surface of the borehole; detecting an received acoustic signal by the acoustic receiver; calculating, by a processor, an incident angle of the received acoustic signal, the incident angle relative to the axial direction; measuring a shift of the propagation angle based on the incident angle; and estimating a property of the formation based on the shift of the propagation angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.