A device and method for measuring the inward expansion and deformation rate of three-dimensional coal matrix

Abstract

The invention discloses a device and method for measuring the inward expansion and deformation rate of a three-dimensional coal matrix. The device includes a gas path system, a coal matrix deformation measurement system, a coal body deformation measurement system, a data acquisition system and a constant temperature water bath system. The gas system mainly provides experimental gas; the coal matrix deformation measurement system and the coal body deformation measurement system are the main test sites, which are placed in the constant temperature water bath system; the data acquisition system mainly collects stress, deformation and water temperature data. The test methods are mainly ①experiment preparation and sample loading, ②setting water bath temperature, ③setting loading stress, ④first vacuuming, ⑤filling helium and measuring experimental parameters, ⑥second vacuuming, ⑦filling Methane gas and measurement of experimental parameters, ②calculation, ⑨repeat the above ②~② steps, ⑩end the experiment. The invention can obtain the internal expansion and deformation rate of the matrix of the three-dimensional coal body under different conditions, and has great significance for improving the accuracy of the calculation of the permeability of the coal seam and scientifically and rationally predicting the extraction effect of the coal seam gas.

Description

technical field [0001] The invention belongs to the technical field of coalbed methane seepage testing, in particular to a device and method for measuring the inward expansion 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 and clean new energy has become particularly important. Coalbed methane is not only a huge reserve but also an efficient and clean energy source worldwide. 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 affecting the production of coalbed methane and the geological sequestration of carbon dioxide. Due to the unique ability of adsorption and deformation of coal, the adsorption deformation during the development of coalbed methane will cause different permeability changes from conventional oil and gas. The i...

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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