Ultrasonic cement and casing thickness evaluation
US10174604B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 2016 |
| Grant date | Jan 8, 2019 |
| Priority date | — |
| Expiry date | Oct 15, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/542
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Methods and systems for logging a wellbore having a casing are described. Acoustic energy, typically ultrasonic acoustic energy, is used to stimulate reverberation of the casing at a harmonic (for example, the second or third harmonic) of the resonance frequency of the casing. One or more acoustic sensors are used to measure acoustic signals generated by the casing reverberation. Parameters of the casing are calculated based on the measured acoustic signals adjusted by an adjustment factor determined by the particular harmonic. The use of harmonics instead of the fundamental resonance frequency allows wellbores with casings having walls thicker than 0.625 inches to be logged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.