Rock automatic gas permeability testing system and calculation method

Abstract

The present invention relates to a system and method for testing the gas permeability of rock, and disclosed are a fully-automated system for testing the gas permeability of rock and an estimation method. A rock core (14) to be tested is placed within a triaxial rock core clamping device (13). A confining pressure is applied in a radial direction of the rock core (14) to be tested by using a confining pressure application system, an axial pressure is applied in an axial direction of the rock core (14) to be tested by using the confining pressure application system, a gas permeation pressure is applied at the left end of the rock core to be tested by using a permeation gas pressurization system (1), and the right end of the rock core (14) to be tested communicates with the atmosphere via a high / middle / low outlet gas flowmeter. The permeability of the rock core to be tested is obtained through data acquisition and automatic calculation by processing software. In this way, a confining pressure, an axial pressure, and a gas permeation pressure of a rock sample can be independently adjusted. By means of the test system, a stable value of gas permeability of a high-, medium-, or low-permeability rock sample can be automatically calculated and stored. The fully-automated system for testing gas permeability of rock and the estimation method of the present invention enable accurate and reasonable analysis of the influence patterns of a confining pressure, an axial pressure, and a permeation pressure on the permeability of rock.

Description

technical field [0001] The invention relates to a rock gas permeability testing system and method, in particular to a rock fully automatic gas permeability testing system and calculation method. Background technique [0002] Permeability characterizes the flow ability of fluid in rock pores and is an important physical parameter of reservoir rocks. [0003] Currently, conventional rock permeability testing methods include liquid measurement method and gas measurement method, both of which are based on Darcy's law. However, compared with the liquid measurement method, the gas measurement method has a smaller dynamic viscosity coefficient, and the gas permeability test time is shorter under the same conditions, so inert gas is often used as the rock permeability test medium. [0004] Commonly used permeability testing methods are mainly steady state method and pressure pulse method. The pressure pulse method has high requirements on the accuracy of the pressure gauge and tak...

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Problems solved by technology

[0006] The purpose of the invention, the purpose of the present invention is to provide a fully automatic gas permeability testing system and calculation method for rocks, to solve the problems of the prior art that the measurement pressure range is small, the test period is long, the test accuracy is poor, and the objectivity of the measurement results is low.

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