Coal-rock adsorption and desorption deformation visualization testing system and method under combined action of water and gas

Abstract

The invention provides a coal-rock adsorption and desorption deformation visualization testing system and method under the combined action of water and gas. The system comprises a testing tank provided with a sealing cavity and a gas supply mechanism for inflating the sealing cavity. The system also comprises an industrial high speed camera for carrying out image shooting on the deformation strainof a coal sample, and the gas supply mechanism comprises a methane gas supply mechanism and a vapor supply mechanism which are connected with the sealing cavity respectively so that deformation strain can be performed on the coal sample under the coexisting condition of water and methane. According to the coal-rock adsorption and desorption deformation visualization testing system under the combined action of water and gas provided by the invention, vapor is introduced into the sealing cavity, and then water adsorption treatment can be carried out on the coal sample in advance, the testing for a gas adsorption and desorption deformation characteristic can be carried out, a gas adsorption and desorption deformation characteristic evolution law including a coal body under the influence of water can be reflected, and a gas adsorption and desorption deformation mechanism of an in situ coal reservoir coal body can be developed more deeply.

Description

technical field [0001] The invention relates to the technical field of coal and rock experiments, in particular to a visual test system for coal rock adsorption and desorption deformation under the joint action of water and gas. The invention also relates to a visual test method for coal rock adsorption and desorption deformation under the joint action of water and gas. Background technique [0002] Coalbed methane (also known as coalbed methane) is a form of methane (CH 4 )-based gas mixture. Due to the strong diffusivity and explosive properties of methane, gas has become an important factor leading to mine disasters such as coal and gas outbursts and gas explosions. At the same time, methane gas is a kind of greenhouse gas, and its greenhouse effect is about 20 times that of carbon dioxide with the same mass. However, compared with coal, gas has the advantages of high combustion calorific value, environmental protection and no pollution, and is currently recognized as ...

AI Technical Summary

Problems solved by technology

Due to the influence of pore interfacial tension, liquid water cannot overcome the interfacial tension and enter the small pores and micropore systems. Therefore, the method of injecting liquid water cannot reflect the influence of internal moisture on the deformation characteristics of coal adsorption and desorption, and cannot restore the original coal storage. The nature of the influence of water in the layer on the deformation characteristics of coal adsorption and desorption

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