Through casing formation slowness evaluation with a sonic logging tool
US11525936B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 2020 |
| Grant date | Dec 13, 2022 |
| Priority date | — |
| Expiry date | Apr 11, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/60
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Reducing casing wave effects on sonic logging data by positioning two or more receivers in a borehole in a subsurface formation; receiving, at two or more receivers in a borehole in a subsurface formation, a first signal associated with a first acoustic signal originating from a first transmitter position; receiving, at the two or more receivers, a second signal associated with a second acoustic signal originating from a second transmitter position; creating a dataset based on the first signal and the second signal; identifying casing wave signals in the dataset based at least in part on the second signal; calculating inverse-phase casing wave signals based at least in part on the casing wave signals and the second signal; and reducing effects of the casing wave signals on the dataset using the inverse-phase casing wave signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.