摘要
为探究页岩储层中的气体传输机理,基于合理描述各种传输机理权重系数的重要性,采用将连续流动和克努森扩散权重叠加的方法,考虑表面扩散、有效应力和气体吸附,建立页岩气体传输模型.结果表明:新建模型的计算值和试验值基本一致,其理论适用性及数据匹配均优于传统模型和Wang模型;有效应力不变时,随孔隙压力升高,页岩表观渗透率降低;孔隙压力不变时,有效应力越大,页岩表观渗透率越小;随裂隙压缩系数增大,页岩表观渗透率减小;吸附变形对孔隙率及渗透率的作用更明显,其对渗透率改变的贡献较大;在低压或小孔径条件下,克努森扩散对气体传输影响较大.
In order to explore the gas transport mechanism in shale reservoirs,based on the importance of reasonably describing the weight coefficients of various transport mechanisms,a shale gas transport model was constructed through weighted superimposition of continuum flow and Knudsen diffusion,taking into account the surface diffusion,effective stress and gas adsorption.The results demonstrate that the calculated value of the new model is basically consistent with the experimental value,and its theoretical applicability and data matching are both superior to those of the traditional model and Wang model.Specifically,under a constant effective stress,the apparent permeability of shale decreases with the increase of pore pressure.When the pore pressure is fixed,the greater the effective stress is,the smaller the apparent permeability of shale is.The apparent permeability of shale decreases with the increase of fracture compression coefficient.Adsorption deformation exerts a more significant impact on porosity and permeability,greatly affecting the variation of permeability.Under the condition of low pressure or small pore size,Knudsen diffusion significantly influences the gas transport.
作者
宋浩晟
李波波
陈帅
李建华
高政
SONG Haosheng;LI Bobo;CHEN Shuai;LI Jianhua;GAO Zheng(College of Mining,Guizhou University,Guiyang,Guizhou 550025,China;Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources,Guizhou University,Guiyang,Guizhou 550025,China;National Joint Engineering Laboratory for Utilization of Dominant Mineral Resources in Karst Area,Guizhou University,Guiyang,Guizhou 550025,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2022年第5期873-885,共13页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(52064007,51804085,51911530203)
贵州省省级科技计划项目(黔科合基础-ZK[2021]重点052)
关键词
表观渗透率
气体传输
有效应力
连续流动
克努森扩散
apparent permeability
gas transport
effective stress
continuum flow
Knudsen diffusion
作者简介
通信作者:李波波(1985-),男,贵州省修文县人,教授,博士生导师,工学博士,从事非常规天然气渗流方面的研究.E-mail:bbli@gzu.edu.cn,Tel:18786016768
