Anti-reflection displacement and multiphase seepage flow physical simulation experiment system and method for coal containing methane

Abstract

The invention discloses an anti-reflection displacement and multiphase seepage flow physical simulation experiment system and experiment method for coal containing methane. The system comprises a model counter-force and sealing system for coal and rock specimen manufacturing and loading experiments, a stress loading system used for exerting axial pressure, a fluid injection system used for performing anti-reflection and displacement treatment on a specimen and a numerical control system used for monitoring physical and mechanics parameters inside the specimen. The anti-reflection measures suchas blasting fracturing and hydraulic fracturing and displacement measures such as injection of CO2, N2 and the like of deep methane adsorbed coal can be simulated; and the physical and mechanics parameters such as the coal stress, the strain, the temperature and the gas pressure can be monitored in real time by sensors arranged inside the specimen, so that the rules and mechanisms of adsorption and desorption, seepage and migration of the methane in the coal and rock under the condition of high crustal stress can be studied.

Description

technical field [0001] The invention belongs to the technical fields of mining engineering and geotechnical engineering scientific research, and in particular relates to a test device system and a test method for studying the coupling effect of gas-adsorbed coal body and gas, steam, liquid and other fluids under the condition of deep high ground stress. Background technique [0002] Coal is the main energy source in China, accounting for more than 70% of the total primary energy consumption. Since the beginning of the 21st century, the basic characteristics of my country's coal resource endowment and the strong demand for energy have promoted the rapid transfer of coal mining to the deep at a rate of 10-25 m per year. However, the mining conditions have also continued to deteriorate, especially in the deep mining conditions The high in-situ stress, high gas pressure and content in coal seams, and complex geological structure conditions all cause coal mine gas disasters to bec...

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Problems solved by technology

However, this device cannot pressurize the coal seam, and cannot inject fluid to enhance the permeability and displace the coal seam.

[0007] (2) The Chinese patent application number 201210515137.1 discloses a coal seam water injection flooding gas simulation experiment system, which includes a cylindrical high-pressure tank with a water injection pipe inside, and the water injection pipe passes through the high-pressure tank and the high-pressure The micro-infusion pump is connected; the system can simulate the change of gas pressure in the coal seam water injection displacement process under different conditions, but it needs to prefabricate the model in advance, and it is impossible to embed sensors inside the test piece, and it is impossible to inject gas to displace gas

[0008] (3) The Chinese patent application number 201520092381.0 discloses a gas-solid coupling physical similarity simulation experiment device, including a three-axis press and a fixing device, a pressurized cylinder and an air intake device, but the size of the loaded test piece of this device is small, Unable to perform anti-reflection and displacement treatment on the specimen

[0012] 1. Most of the test models are prefabricated in advance, requiring additional equipment to make test pieces, and the operation is cumbersome

[0013] 2. The sensors used in the test are mostly installed on the surface of the test piece, and cannot be buried inside, so that physical parameters such as gas occurrence and migration inside the test piece and physical quantities such as coal stress and strain cannot be effectively measured

[0014] 3. The function of the test device is relatively single, and it is impossible to realize the simultaneous injection of multiple fluids during the loading process of the test piece, and it is impossible to simulate the combined effect of coal seam permeability enhancement and displacement methods on coal seam gas penetration at the same time

[0015] 4. The installation and disassembly process of the test device is cumbersome, and the steps of device opening and test piece placement are complicated

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