Techniques for evaluating borehole subsurface geologies using Stoneley waves
US11261721B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2017 |
| Grant date | Mar 1, 2022 |
| Priority date | — |
| Expiry date | Nov 15, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/646
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method evaluating borehole subsurface geologies can include receiving a total response signal by a sensor array disposed in a borehole, the response signal represents a pressure wave propagating in the borehole. A secondary signal can be extracted from the total response signal and a depth location for at least one secondary source that corresponds to the secondary signal is determined. An estimated reflectivity response for the secondary signal as a function of frequency is determined and the estimated reflectivity response is inverted to determine the secondary source includes at least one of a potential fracture or a potential washout. The at least one of a fracture conductivity or a washout volume for the secondary source is compared to one or more borehole images corresponding to the depth location of the secondary source to determine the potential fracture is an actual fracture or the potential washout is an actual washout.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.