Device and method for measuring inward expansion deformation rate of three-dimensional coal matrix

Abstract

The invention discloses a device and a method for measuring the inward expansion deformation rate of a three-dimensional coal matrix. The device comprises a gas path system, a coal matrix deformationmeasuring system, a coal body deformation measuring system, a data acquisition system and a constant-temperature water bath system. The gas path system is mainly used for providing experimental gas; the coal matrix deformation measuring system and the coal body deformation measuring system are main test sites and are arranged in the constant-temperature water bath system; the data acquisition system is mainly used for acquiring stress, deformation and water temperature data. The method mainly comprises the following steps: (1) experiment preparation and sample loading; (2) setting of water bath temperature; (3) setting of loading stress; (4) primary vacuumizing; (5) helium filling and determination of experiment parameters; (6) secondary vacuumizing; (7) methane gas filling and determination of experiment parameters; (8) calculation; (9) repeating of (2) to (8); and (10) finishing; according to the method, the matrix internal expansion deformation rate of the three-dimensional coal body under different conditions can be obtained, and the method has great significance in improving the accuracy of coal seam permeability calculation and scientifically and reasonably predicting the coal seam gas extraction effect.

Description

technical field [0001] The invention belongs to the technical field of coalbed gas seepage testing, in particular to a device and method for measuring the inward expansion and deformation rate of a three-dimensional coal matrix. Background technique [0002] With the demand for economic development and environmental protection, the development of low-carbon clean new energy has become particularly important. Coalbed methane is not only a huge reserve in the world, but also an efficient and clean energy. In recent decades, the research and development of coalbed methane has become one of the international focuses. The permeability of coal is an important parameter that affects the output of coalbed methane and the geological storage of carbon dioxide. Due to the unique ability of coal to absorb and deform, the adsorption and deformation of coalbed methane will cause different permeability changes from conventional oil and gas during the development process of coalbed methane...

AI Technical Summary

Problems solved by technology

In the past, the inward expansion and deformation rate of the coal matrix was mostly obtained by indirect fitting with the theoretical model under the known experimental conditions and permeability. accuracy will affect the

Up to now, there is no experimental device and its matching method that can systematically and directly measure the inward expansion deformation rate of coal matrix.

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