Combined control of fluid adsorption capacity and initial permeability on coal permeability
Xiaolei Liu1
Jianping Wei1
Guoying Wei1
Caifang Wu2
Cao Liu1
Xiaoming Ni3
1.State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Henan Polytechnic University,454000 Jiaozuo,Henan,China;College of Safety Science and Engineering,Henan Polytechnic University,454000 Jiaozuo,Henan,China;State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization,454000 Jiaozuo,Henan,China2.Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process,Ministry of Education,South Jiefang Road,221008 Xuzhou,Jiangsu,China3.Collaborative Innovation Center of Coalbed Methane(Shale Gas)in Central Plains Economic Zone,454000 Jiaozuo,China
摘要：The variations of strain and permeability of coal were systematically studied through the physical simulation of N2 and water injection.The effects of fluid adsorption capacity and initial permeability on strain,permeability and the dominant effect of pore pressure were discussed.The adsorption strain and strain rate of coal during water injection are significantly higher than those during N2 injection.An edge of free adsorption exists in the early phase of N2 and water injection,which is related to fluid saturation.Within this boundary,the strain rate and pore pressure are independent.Moreover,the injec-tion time of initial stage accounts for about 20％of the total injection time,but the strain accounts for 70％of the total strain.For water injection,this boundary is about half of water saturation of coal.Besides,the influence of pore pressure on permeability is complex,which is controlled by adsorption capacity and initial permeability of coal.When the initial permeability is large enough,the effect of adsorption strain on permeability is relatively weak,and the promoting effect of pore pressure on fluid migration is dominant.Therefore,the permeability increases with increasing pore pressure.When the initial permeability is relatively low,the pore pressure may have a dominant role in promoting fluid migration for the fluid with weak adsorption capacity.However,for the fluid with strong adsorption capacity,the adsorption strain caused by pore pressure may play a leading role,and the permeability reduces first and then ascends with increasing pore pressure.
机标关键词：permeabilitycontroladsorptioncapacitycoalcombinedfluidinitial
论文发表日期：2022-12-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：11( 127-137 )
英文信息