温度与孔隙压力耦合作用下煤岩吸附–渗透率模型研究

doi:10.13722/j.cnki.jrme.2019.0822

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Abstract In order to simulate the influence of temperature and pore pressure on the adsorption and permeability characteristics of coal during gas drainage，the isothermal adsorption experiments and the seepage tests in the gas reduce process under different temperatures were carried out respectively by using the isothermal adsorption device and the triaxial servo-controlled seepage equipment for the thermo-fluid-solid coupling of coal containing methane. A modified dual-site L adsorption model was established，and on this basis，a coal permeability model considering the coupling effect of temperature and pore pressure was proposed. The rationality of the new permeability model was verified by test results. The results show that，under the experimental conditions，the cumulative desorption of gas increases with decreasing the gas pressure. The permeability of coal decreases first and then increases with decreasing the pore pressure under a constant temperature. With rising the temperature，the permeability of coal decreases first and then increases under a constant pore pressure. The modified dual-site L adsorption model has better fitting effect than the original model，and can well reflect the relationship between the adsorption capacity of coal and the gas pressure at different temperatures. In the process of gas desorption in coal，the contraction strain of the matrix increases with decreasing the pore pressure. The new permeability model has a good consistency with the test data and can better represent the permeability evolution law under different temperatures.

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	LI Bobo1
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	GAO Zheng1
	YANG Kang1
	LI Jianhua1
	REN Chonghong1
	XU Jiang4
	CAO Jie4

Cite this article:

LI Bobo1,2,3, et al.

Study on coal adsorption-permeability model under the coupling of temperature and pore pressure

[J]. , 2020, 39(4): 668-681.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0822 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I4/668

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