Method and system for cement bond evaluation high acoustic velocity formations
US5907131A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 27, 1997 |
| Grant date | May 25, 1999 |
| Priority date | — |
| Expiry date | Aug 27, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/005
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An acoustic logging tool having an acoustic transmitter and at least one acoustic receiver longitudinally spaced from the transmitter is lowered into a borehole fluid within a tubular member having a known resonant frequency. A pulse of acoustic energy is then transmitted into the tubular member, and acoustic energy traversing the tubular member and formation is detected at the acoustic receiver. A frequency domain transformation is performed on the detected acoustic energy and a cement bond evaluation is performed by comparing transformed detected acoustic energy amplitudes within a predetermined range of the resonant frequency of the tubular member, effectively filtering out acoustic energy which traverses the formation surrounding the tubular member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.