Gas permeability determination method of nano-pore-containing reservoir

A technology of gas permeability and nanoporosity, which is applied in permeability/surface area analysis, suspension and porous material analysis, measurement devices, etc., and can solve problems such as the inability to measure the permeability of tight reservoirs

Active Publication Date: 2018-07-10
PETROCHINA CO LTD +1
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Problems solved by technology

The lattice Boltzmann method is a numerical simulation calculation method, which can be used to simulate the gas flow state in nanoscale porous media in the mesoscopic state. Its advantage is that it can greatly reduce the errors generated in the experimental process, and can Realize the conditions that cannot be achieved in the experiment, so as to solve the problem that the permeability of the too dense reservoir cannot be measured

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  • Gas permeability determination method of nano-pore-containing reservoir
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  • Gas permeability determination method of nano-pore-containing reservoir

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[0025] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0026] The invention can be applied to measure the gas permeability of reservoirs containing nano-scale pores, and the experimental data obtained by simulating is in line with conventional knowledge. Below, the present invention will be further described according to the determination process of the shale rock obtained from the field, in ...

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Abstract

The invention relates to a gas permeability determination method of a nano-pore-containing reservoir. The method includes the steps: simulating and calculating gas flow in a digital model matrix of arock by a lattice Boltzmann method (LBM), and counting average fluid velocity under different inlet pressure conditions mu (m / s); performing least square fitting on average fluid velocities corresponding to different inlet-outlet pressure differences by the aid of fitting target functions to obtain unknown intrinsic permeability Ko (m<2>) and a diffusion coefficient Dk (m<2> / s) of the rock; calculating a slip factor bk (Pa), and calculating gas permeability of the rock, namely, apparent permeability Ka (m<2>). The method solves the problem that the permeability of an excessively compact reservoir cannot be measured.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a method for determining gas permeability parameters of reservoirs containing nano-pores. First, the internal structure state of the reservoir core is obtained through CT scanning, and the relationship between flow and pressure difference is calculated by LBM numerical simulation, and then the permeability of the reservoir core is determined. Background technique [0002] For reservoirs containing nanopores, narrow pore channels and extremely low permeability are the unique properties of such reservoir rocks. The diameter of pores in this reservoir rock ranges from 0.1nm to 100nm. Only gas molecules can flow through such narrow pores, while ordinary liquids cannot easily flow through. Due to the limited precision of the traditional plunger experiment, the measurement error of the permeability is too large, and the gas permeability of the shale c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 王瑞飞宋洪庆王俊奇秦文龙董凤娟王妍
Owner PETROCHINA CO LTD
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