Shale Gas Diffusion Capability Test System

Abstract

The invention discloses a test system of shale gas diffusivity. The test system of the shale gas diffusivity comprises a core holder used for placing a core sample and provided with a first end and a second end, a confining pressure applying mechanism which is connected with the core holder and used for applying confining pressure to the core sample, a first container in which methane of first predetermined pressure is stored, and communicated with the first end of the core holder, a second container in which methane of second predetermined pressure is stored, and communicated with the second end of the core holder, a measuring mechanism which can measure pressure values of the first container and the second container and a computing unit which is connected with the measuring mechanism and can determine gas diffusion information according to the pressure values of the first container and the second container, wherein the core holder comprises a first end and a first second end, and the pressure difference of the first predetermined pressure and the second predetermined pressure is greater than 0 and less than the predetermined value.

Description

technical field [0001] The invention relates to the field of shale gas diffusion capability testing, in particular to a shale gas diffusion capability testing system under extremely small pressure difference conditions. Background technique [0002] Shale gas is a natural gas resource that can be exploited in shale formations. Shale gas refers to unconventional natural gas that occurs in organic-rich mud shale and its interlayers. It mainly exists in the state of adsorption and free. Mainly, it is a clean and efficient energy resource and chemical raw material. China has relatively large recoverable reserves of shale gas and has broad prospects for exploitation. [0003] Among them, the flow mechanism of shale gas reservoirs is relatively complex, and seepage and diffusion exist simultaneously. The physical properties of shale gas reservoirs are poor, the matrix pore throat diameter is about 1-1000nm, the porosity varies from 2% to 5%, and the matrix permeability is extreme...

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Problems solved by technology

[0005] Through literature research, it is found that there is currently no experimental research on the diffusion of shale gas under the condition of extremely small pressure difference, which limits the in-depth understanding of the diffusion mechanism and law in the near-equilibrium state, and hinders the development of shale gas production technology.

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