| 摘要 |
<p>A pressure (416) and temperature (288) core sampler a tool (100) 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 (100) 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 (100) is preferably a wire line retrievable device (350) that provides for nearly continuous coring during the drilling operation (102).</p> |
