Identifying formation layer tops while drilling a wellbore
US11920460B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 2021 |
| Grant date | Mar 5, 2024 |
| Priority date | — |
| Expiry date | Jun 29, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/64
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Some systems and methods for determining depths of subterranean formation layer tops while drilling through the subterranean formation include a drill bit, a drill rig, a microphone, a depth sensor, and a processor. While drilling the through the subterranean formation, the processor receives a measured sound from the microphone and a measured drill bit depth from the depth sensor, normalizes the measured sound across all measured drill bit depths, determines frequency information of the normalized sound for each depth of the plurality of depths, determines frequency spectrums of the normalized sound for one or more depths of the plurality of depths, transforms the frequency spectrums into a depth spectrum, and determines the depths of subterranean formation layer tops based on the depth spectrum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.