Fidelity sampling instrument applied to shale gas and method for thermal analysis of shale gas

Abstract

The invention discloses a fidelity sampling instrument applied to shale gas and a method for thermal analysis of shale gas. The method is used for solving the technical problem that in the sampling, rock core transferring and analysis processes, a part of gas escapes from a rock sample due to the fact that a sampling tool is salvaged to a ground surface during sampling and the occurrence environment of the target layer rock sample has changed, so that the gas content error of the target layer of the analysis result is large. The fidelity sampling device assembly is internally integrated with alifting mechanism, a detection assembly, a sampling assembly and a sampling passage, wherein one end of the detection assembly is detachably connected with the lifting mechanism, the sampling assembly is used for sampling and obtaining the rock core containing the shale gas, the sampling passage is formed between the detection assembly and the sampling assembly, the detection assembly is used fordetecting the pressure and the temperature in the sampling passage, the pressure maintaining assembly is provided with an opening state and a closed state, and the opening state is used to realize that the sampling passage can reach the target position.

Description

technical field [0001] The invention relates to the technical field of shale gas sampling and thermal analysis equipment, in particular to a fidelity sampling device applied to shale gas and a method for thermal analysis of shale gas. Background technique [0002] Shale gas is a kind of unconventional natural gas that occurs in organic shale or mudstone, part of which exists in the natural fractures or pores of the formation in a free state, part of which is adsorbed on the surface of kerogen or clay particles, and a very small amount is dissolved State exists in kerogen or asphaltenes. In order to evaluate the content of underground shale gas, drilling and sampling has become an indispensable technical means. [0003] In the prior art, the mature rope coring technology is usually used to obtain rock samples, and the sample collection rate has been able to meet the test requirements. However, in the process of sampling and core analysis and transfer, as the sampling tools ...

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Problems solved by technology

[0004] The present invention solves the problem that in the process of sampling and core analysis and transfer in the prior art, the sampling tool is salvaged to the surface, and the storage environment of the rock sample in the target layer has changed, causing a part of the gas to escape from the rock sample, which in turn leads to analysis results The technical problem of not being able to fully and truly reflect the gas content of the target formation, the fidelity sampling device applied to shale gas and the method of thermal analysis of shale gas are proposed

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