Methods and apparatus for cement bond evaluation through production tubing
US11746643B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 2021 |
| Grant date | Sep 5, 2023 |
| Priority date | — |
| Expiry date | Jan 12, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/1429
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Various downhole logging tools and methods of using and making the same are disclosed. In one aspect a method evaluating cement bond quality in a well is provided. In a well with a particular casing/tubing configuration, waveforms of acoustic energy returning from the tubing and the casing with the tubing present are recorded. A frequency spectrum from the recorded waveforms is determined. Amplitudes of the returning acoustic energy at one or more preselected frequency(s) of interest of a range of frequencies at which the amplitudes are noticeably affected by cement bond quality for the particular casing/tubing configuration are determined. The determined amplitudes are compared with one or more baseline amplitudes to look for indications of cement bond quality. Other aspects involve time domain analysis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.