煤层气采收诱发储层沉降及应力演化的三维模型数值模拟

doi:10.13722/j.cnki.jrme.2022.0640

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Abstract In this contribution，we developed a numerical model for describing a coupled effect of stress-strain-sorption-diffusion-permeability on evolution of deformation and internal stress in coal seams during coalbed methane(CBM) recovery，assuming that coal behaves as a poroelastic media. Three-dimensional discrete fracture network of a coal seam was first constructed using COMSOL，consisting of natural and hydraulic fractures. On this basis，we quantitatively determined the development of subsidence and internal stress of the constructed coal seam，using our proposed numerical model，given proper parameter values. The results indicate，that：(1) subsidence mainly occurred on the top of the coal seam，which was located near the both sides of fractures，resulting in a vertical dislocation along the natural fractures and the dislocation rate can be up to 2 mm per year. (2) Both the intermediate and minimum principal stresses in the area near the natural fractures decreased significantly，while the minimum principal stress exhibited a transition from compression to tensile，which can reach to 3 MPa. In addition，parameter sensitive analysis was performed to determine the main factors controlling CBM recovery induced dislocation and stress evolution. By the research we suggests that during CBM recovery，deformation and stress drops around the natural fractures should be paid more attentions as it may cause local damage and even earthquake，though the CBM recovery induced subsidence is relatively small.

Key words： rock mechanicsc oalbed methane coalbed subsidence stress evolution stress-strain-sorption-diffusion-permeability coupling three-dimensional discrete fracture network finite element method

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	ZHU Yuxun1
	LIU Jinfeng1
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Cite this article:

ZHU Yuxun1,LIU Jinfeng1,2, et al. Three-dimensional numerical simulation for estimating subsidence and stress evolution in coal seams during coalbed methane recovery[J]. , 2023, 42(S1): 3293-3308.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0640 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3293

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