发明名称 |
Method for compensating for remote clock offset |
摘要 |
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.
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申请公布号 |
US6400646(B1) |
申请公布日期 |
2002.06.04 |
申请号 |
US19990457996 |
申请日期 |
1999.12.09 |
申请人 |
HALLIBURTON ENERGY SERVICES, INC. |
发明人 |
SHAH VIMAL V.;MINEAR JOHN W.;MALLOY ROBERT;BIRCHAK JAMES R.;GARDNER WALLACE R.;ROBBINS CARL |
分类号 |
E21B47/16;G01V1/26;G04G7/00;H04L7/02;(IPC1-7):H04H9/00 |
主分类号 |
E21B47/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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