Method for compensating for remote clock offset
US6400646B1 · kind B1 · utility
67Cited by
12References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1999 |
| Grant date | Jun 4, 2002 |
| Priority date | — |
| Expiry date | Dec 9, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/007
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system is disclosed for synchronizing a clock in a well containing a drill string with a clock located near the surface of the well. The system includes devices for transmitting and receiving a pair of acoustic signals between locations associated with each clock and processing those signals. The system determines the time of arrival of each acoustic signal by analyzing the shape of a function of the acoustic signal chosen from a group of functions suitable to determine a clock offset with millisecond accuracy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.