Full-automatic test system and measurement method for gas permeability of rock

Abstract

The invention discloses a full-automatic test system and measurement method for gas permeability of rock and belongs to the test system and method for the gas permeability of the rock. A to-be-tested core is placed in a three-axis core clamping device, confining pressure is loaded in the circumferential direction of the to-be-tested core through a confining pressure loading system, axial load is loaded in the axial direction of the to-be-tested core through the confining pressure loading system, gas seepage pressure is loaded at the left end of the to-be-tested core through a seepage gas boosting system, the right end of the to-be-tested core is communicated with the atmosphere through a high outlet gas flowmeter, a medium outlet gas flowmeter and a low outlet gas flowmeter, and the permeability of the to-be-tested core is obtained through automatic calculation of data acquisition and processing software. The confining pressure, the axial load and the gas seepage pressure of a rock sample can be adjusted independently, and with adoption of the test system, stable values of the gas permeability of rock samples with high permeability, medium permeability and low permeability can be calculated and stored automatically. The full-automatic test system and measurement method for the gas permeability of the rock can precisely and reasonably analyze the law of the influence of the confining pressure, the axial load and the seepage pressure on the rock permeability.

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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