Method of determining drill string velocity
US4829489A · kind A · utility
14Cited by
3References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1988 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | Jun 1, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/161
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention is a method of determining the acoustic velocity of a drill string in a borehole. An acoustic signal is generated at a first location along the drill string, and detected at a second location. The detected signal is autocorrelated and the time of occurrence of multipath reflections on the autocorrelation record is utilized to determine acoustic velocity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.