Simulation apparatus and method for researching permeability of coal rock

Abstract

The present invention relates to a simulation apparatus and a method for researching the permeability of coal rock. The simulation apparatus comprises: a stress loading cavity; a sealing sleeve configured into a sealing cavity for arranging coal rock; a fluid container communicated to the sealing cavity; and a stress loading shaft arranged in the stress loading cavity and used for applying stress on the coal rock by extruding the sealing sleeve. According to the present invention, with the simulation apparatus, the condition close to the actual situation in the stratum during the research of the permeability of the coal rock can be achieved, and the influence of the matrix desorption shrinkage, the fracture closure and the combination of the matrix desorption shrinkage and the fracture closure on the permeability change under the stress anisotropy simulating condition during the discharging-extracting process can be respectively and quantitatively measured, such that the stimulated measurement of the coal rock directional permeability and the dynamic process of the coal rock directional permeability change along with the pore pressure reducing during the discharging-extracting process can be achieved.

Description

technical field [0001] The invention relates to the technical field of coal-rock mining research, in particular to a simulation device and method for studying coal-rock permeability. Background technique [0002] Due to the complexity of coalbed methane mining and the gradual emergence of many problems in the mining process, reasonable simulation and understanding of the desorption, diffusion and seepage processes in the reservoir are the key to the efficient mining of coalbed methane. At present, coalbed methane mining research is usually carried out by studying the permeability of coal rocks. [0003] At present, a simulation device for studying the permeability of coal rocks includes a stress loading chamber for setting coal rocks, a fluid container communicated with the stress loading chamber, and a stress loading shaft arranged in the stress loading chamber. When the permeability of the coal rock needs to be measured, the coal rock is firstly pressurized through the st...

AI Technical Summary

Problems solved by technology

However, after the stress loading shaft for movement is provided in the stress loading chamber, it is easy to cause poor sealing effect of the stress loading chamber

That is, it is easy to affect the sealing environment of coal rock

[0004] Therefore, how to solve the problem of poor sealing of the existing stress loading chamber is a technical problem to be solved by those skilled in the art

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