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《Journal of China University of Petroleum(Edition of Natural Science)》 2013-01
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Transport mechanisms and numerical simulation of shale gas reservoirs

YAO Jun,SUN Hai,FAN Dong-yan,HUANG Zhao-qin,SUN Zhi-xue,ZHAGN Guo-hao(School of Petroleum Engineering in China University of Petroleum,Qingdao 266580,China)  
Based on dual porosity continuum media,the kinematic equations in matrix and fracture were built by using dusty gas model(DGM).Viscous flow,Knudsen diffusion,free molecular diffusion and gas adsorption-desorption in pore surface were considered in matrix,the Langmuir isotherm adsorption equation was used in the dual porosity model.Viscous flow,Knudsen diffusion and free molecular diffusion were considered in fractures.Matrix-fracture dual porosity numerical model was established and calculated by finite element method.The influence factors of shale gas production were analyzed based on the numerical simulation results.The results show that the produced gas comes from both free gas and desorbed gas.The influence of free gas on shale gas production is greater than that of desorbed gas,but the adsorption should be considered in prediction of shale gas production because the predicted shale gas rate is low without considering adsorption.The Knudsen diffusion and Klinkenberg effect have great impact on matrix apparent permeability especially near the production wells,and the matrix apparent permeability increases with production time prolonging.The shale gas production increases with the fracture permeability increasing,and the matrix permeability has little influence on shale gas production.
【Fund】: 国家自然科学基金项目(51234007);; 教育部博士点基金项目(20110133120012);; 中国石油大学(华东)自主创新项目(11CX05007A);; 国土资源部海洋油气资源与环境地质重点实验室开放基金项目(MRE201207)
【CateGory Index】: P618.13
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