Methods for clock synchronization in wellbore instruments
US8378839B2 · kind B2 · utility
3Cited by
10References
4Claims
0Family size
Assignee
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Key dates
| Filing date | May 26, 2009 |
| Grant date | Feb 19, 2013 |
| Priority date | — |
| Expiry date | Oct 15, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for synchronizing a clock in a device at the Earth's surface with a device disposed in a wellbore includes generating a time datum for a signal generated at at least one of the surface and in the wellbore proximate an end of the pipe string. A time delay is determined between detection of the signal at the at least one repeater and retransmission of the signal from the at least one repeater. The time datum is appended with a signal corresponding to the time delay. The retransmitted signal is detected at the other of proximate the end of the pipe string and at the surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.