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1. 发明申请

US20090229382A1 SAMPLING METHOD AND SAMPLER FOR GAS HYDRATES BY HOLE BOTTOM FREEZING 有权
标题翻译：通过孔底冷冻采样方法和采样气体水合物
公开(公告)号：US20090229382A1
公开(公告)日：2009-09-17
申请号：US12402834
申请日：2009-03-12
申请人： Youhong Sun , Wei Guo , V. K. Chistyakov , Chen Chen , Zupei Zhang , Jun Xue
发明人： Youhong Sun , Wei Guo , V. K. Chistyakov , Chen Chen , Zupei Zhang , Jun Xue
IPC分类号： G01N1/22
CPC分类号： G01N1/08 , E21B25/08 , E21B25/18
摘要： The present invention relates to a sampler for gas hydrates by hole bottom freezing, the sampler comprises a fisher, a wire-line coring mechanism and an outer barrel, and it further comprises a refrigeration portion, a low temperature control portion and a frozen insulation sample portion, which constitute an inner barrel assembly located inside the outer barrel together, wherein a refrigerant in the refrigeration portion is injected into the frozen insulation sample portion under a control of the low temperature control portion, so that a cooling medium in the frozen insulation sample portion is always kept under a predetermined temperature, and a core sample of gas hydrates is frozen at the bottom of a drill hole. The invention also relates to a sampling method using the sampler as mentioned above. In the invention, the temperature of the sample can be decreased by using an external cooling source to suppress hydrate decomposition, the critical decomposition pressure of gas hydrates can be reduced by active decreasing the temperature of the sample, and the stability of gas hydrates is maintained by a passive pressure drop. The method of the present invention need not to keep the pressure of the sample, and is simple to obtain a core sample of gas hydrates with higher fidelity.
摘要翻译：本发明涉及一种通过孔底冷冻进行天然气水合物的采样器，该采样器包括渔夫，线路取芯机构和外筒，还包括制冷部分，低温控制部分和冷冻绝热样品部分，其构成位于外筒内部的内筒组件，其中制冷部分中的制冷剂在低温控制部分的控制下被注入到冷冻绝热样品部分中，使得冷冻绝热样品中的冷却介质部分总是保持在预定温度下，并且气孔水合物的芯样品在钻孔的底部被冷冻。本发明还涉及如上所述使用采样器的采样方法。在本发明中，通过使用外部冷却源抑制水合物分解，可以降低样品的温度，通过主动降低样品的温度可以降低气体水合物的临界分解压力，并保持气体水合物的稳定性被动压降。本发明的方法不需要保持样品的压力，并且获得具有更高保真度的气体水合物的核心样品是简单的。

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