Method and device for determining gas flow in shale nanopores

Abstract

The invention provides a method and device for determining the gas flow in a shale nanopore, and the method comprises the steps: obtaining the physical attribute data of a target shale nanopore; according to a preset effective molecular free path model and the physical attribute data, determining an effective molecular free path in the target shale nanopore, the preset effective molecular free path model being established according to a geometric truncation effect of a shale pore wall surface on a free motion path of gas molecules and an influence of an interaction between the shale pore wallsurface and the gas molecules on the free motion path of the molecules; and according to a preset in-channel unit width gas mass flow model and the effective molecular free path, the gas mass flow inthe target shale nanopore is determined, and the preset in-channel unit width gas mass flow model is established according to a preset effective molecular free path model. According to the method, thecalculation accuracy of the gas flow of the shale nanopores can be effectively improved, and theoretical support is provided for shale gas reservoir development.

Description

technical field [0001] The present application relates to the technical field of shale gas exploration and development, in particular to a method and device for determining gas flow in shale nanopores. Background technique [0002] Different from conventional oil and gas reservoirs, shale gas reservoirs, as an unconventional oil and gas resource, are characterized by the development of nanoscale pores and large pore specific surface area. Factors related to the wall have a significant impact on the gas flow in the nanopore. Among them, the wall force or the wall-gas interaction strength plays a non-negligible role in the momentum and energy transfer process, which needs to be paid attention to. [0003] However, based on the existing gas flow calculation methods in shale nanopores, there are often large differences between the gas flow in shale nanopores and the actual situation. That is, the existing method does not consider the interaction between the nanopore wall and ga...

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Problems solved by technology

[0005] The embodiment of the present application provides a method and device for determining the gas flow rate in shale nanopores, so as to solve the problem that the calculation method of gas flow rate in shale nanopores in the prior art does not take into account the interaction between the wall surface and gas molecules, resulting in low calculation accuracy. low problem

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