Boring or penetrating the earth – With heating or cooling drilling fluid
Reexamination Certificate
2009-03-12
2011-12-13
Williams, Hezron E (Department: 2856)
Boring or penetrating the earth
With heating or cooling drilling fluid
C073S863110, C073S864440, C073S864510
Reexamination Certificate
active
08074739
ABSTRACT:
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.
REFERENCES:
patent: 2812160 (1957-11-01), West et al.
patent: 4371045 (1983-02-01), McGuire et al.
patent: 6378631 (2002-04-01), Aumann et al.
patent: 7748265 (2010-07-01), Reid et al.
Chen Chen
Chistyakov Valery Konstantinovich
Guo Wei
Sun Youhong
Xue Jun
Jilin University
Kolb Nathaniel
Occhiuti Rohlicek & Tsao LLP
Williams Hezron E
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