Methods for determining positions of fluid interfaces and detecting cement setting in a subterranean wellbore
US12139996B2 · kind B2 · utility
0Cited by
8References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2020 |
| Grant date | Nov 12, 2024 |
| Priority date | — |
| Expiry date | Dec 14, 2040 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/20
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Methods for locating fluid interfaces in a cased wellbore include generating vibrations in the casing, thereby forming oscillations in the wellbore fluids and the casing. The oscillations are detected by a vibration detector. The oscillations are recorded by a data acquisition system. Mathematical processing of the oscillations by cepstrum analysis is performed to determine the depths of interfaces between fluids in the annulus. The methods may also be employed to determine the time at which a cement slurry begins to set and harden. The methods may be performed in real time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.