发明名称 |
Method and apparatus for recovering core samples under pressure |
摘要 |
A pressure and temperature core sampler comprises a tool for recovering cores specifically enabling the evaluation of methane hydrate resources. Because methane hydrate tends to decompose under conditions of pressure decrease and/or temperature increase as the samples are retrieved to the surface, a coring tool in accordance with the present invention provides a self-contained system for retrieving core samples at or near in situ pressure while cooling the core sample. The coring tool is preferably a wire line retrievable device that provides for nearly continuous coring during the drilling operation.
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申请公布号 |
US6659204(B2) |
申请公布日期 |
2003.12.09 |
申请号 |
US20010779896 |
申请日期 |
2001.02.08 |
申请人 |
JAPAN NATIONAL OIL CORPORATION |
发明人 |
AUMANN JAMES T.;HYLAND CRAIG R. |
分类号 |
E21B25/08;(IPC1-7):E21B25/00;E21B49/00 |
主分类号 |
E21B25/08 |
代理机构 |
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