基于SEM图像的煤层气渗流裂隙开度影响的模拟研究
Simulation Study on Effect of Crack Opening Degree of Coalbed Methane Seepage Based on SEM Image
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摘要: 通过SEM技术获得煤真实裂隙结构,用以解决煤的非均匀性表征问题。基于裂隙结构特征,使用COMSOL求解Stokes方程来计算气体流动的动力特性,并建立气体渗透率的计算模型,同时定量化的研究了裂隙开度对渗透率的影响。结果表明:裂隙开度对煤层气渗透率的影响很大,同时当考虑Klinkenberg效应时,修正了其气体裂隙流动模型。Abstract: In this paper, the real fracture structure of coal is obtained by SEM technology to solve the problem of non-uniformity characterization of coal. Based on the characteristics of fracture structure, the dynamic characteristics of gas flow are calculated by solving the Stokes equation by COMSOL. The calculation model of gas permeability is established, and the influence of fracture opening on permeability is studied quantitatively. The results show that the fracture opening has great influence on the permeability of CBM. When the Klinkenberg effect is considered, the gas crack flow model is modified.