Low-permeability coal seam acidification anti-reflection loaded coal gas seepage multi-field coupling experiment system and experiment method

Abstract

The invention discloses a low-permeability coal seam acidification anti-reflection loaded coal gas seepage multi-field coupling experiment system which comprises a coal sample holder used for containing a coal sample and a water absorption sponge; an inlet of the coal sample holder is connected with a gas injection mechanism, an outlet of the coal sample holder is connected with a discharge measuring mechanism, and the side wall of the coal sample holder is connected with a true triaxial loading system for generating confining pressure; the gas injection mechanism is used for injecting methane gas and hydrogen sulfide gas into the coal sample holder in sequence, and the hydrogen sulfide gas is used for reacting with water in the coal sample holder to generate weak acid liquor. The invention further discloses a corresponding experiment method. The low-permeability coal seam acidification anti-reflection loaded coal gas seepage multi-field coupling experiment system is developed, experimental research on the influence factors of the gas seepage of the loaded coal body under the true triaxial condition is performed, and the influence characteristics of factors such as acidification time, ground stress and temperature on a specific coal body seepage rule when the low-permeability coal seam is mined under the acidification effect are revealed, and the gas extraction practice of the simulated stratum is guided.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to coal seam anti-reflection and gas drainage technologies. Background technique [0002] The geological occurrence structure of coal in my country is complex and varied, and coal seams generally belong to low-permeability reservoirs. With the depletion of shallow coal resources, deep mining will become the normal state in the development of coal resources, and more and more mines are facing the problem of deep mining. [0003] The deep coal seam is in a complex environment such as high geostress, high geothermal temperature and high gas pressure, and the effect of high geostress makes the gas permeability of the coal seam lower. [0004] The applicant noticed that there is a correlation between the acidification degree of coal body and the anti-permeability effect. In the existing experimental system research, there is a lack of research on the correlation between the degree ...

AI Technical Summary

Problems solved by technology

When conducting coal acidification experiments, if the acid leaks, it is often not found immediately, which will cause damage to the experimental site and objects, and will also cause harm to the experimenters.

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