发明名称 |
Method and system for downhole clock |
摘要 |
A downhole crystal-based clock that is substantially insensitive to the factors that cause frequency deviation. The clock may be maintained at a predetermined temperature using a temperature sensing device and a heating device where the predetermined temperature corresponds to the temperature at which the crystal experiences only slight frequency deviation as a function of temperature. A microprocessor may monitor the clock and compensate for long-term aging effects of the crystal according to a predetermined algorithm. The predetermined algorithm may represent long-term aging effects of the crystal which were derived by comparing the crystal clock to a more accurate clock (e.g., an atomic clock) prior to placing the clock downhole. In this manner, the crystal-based clock may be substantially free from the factors that cause frequency, and therefore time variations. |
申请公布号 |
GB2419431(A) |
申请公布日期 |
2006.04.26 |
申请号 |
GB20050024650 |
申请日期 |
2004.03.26 |
申请人 |
HALLIBURTON ENERGY SERVICES, INC. |
发明人 |
GEORGIOS L VARSAMIS;GARY D ALTHOFF;DENIS P SCHMITT;ABBAS ARIAN;JAMES H DUDLEY;LAURENCE T WISNIEWSKI |
分类号 |
H03L1/02;E21B47/01 |
主分类号 |
H03L1/02 |
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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