Combined control of fluid adsorption capacity and initial permeability on coal permeability
作者机构：State Key Laboratory Cultivation Base for Gas Geology and Gas ControlHenan Polytechnic University454000 JiaozuoHenanChina College of Safety Science and EngineeringHenan Polytechnic University454000 JiaozuoHenanChina State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization454000 JiaozuoHenanChina Key Laboratory of Coalbed Methane Resource and Reservoir Formation ProcessMinistry of EducationSouth Jiefang Road221008 XuzhouJiangsuChina Collaborative Innovation Center of Coalbed Methane(Shale Gas)in Central Plains Economic Zone454000 JiaozuoChina
出 版 物：《International Journal of Coal Science & Technology》 (国际煤炭科学技术学报（英文）)
年 卷 期：2022年第9卷第6期
页 面：127-137页
核心收录：
学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学]
基 金：supported by the National Natural Science Foundation of China(41872170,42072189) China Postdoctoral Science Foundation(2021M690916) Key Science and Technology Program of Henan Province(222102320154) State Key Laboratory Cultivation Base for Gas Geology and Gas Control(Henan Polytechnic University)(WS2020B10) Key Scientific Research Projects of Colleges and Universities in Henan Province(21A440006) Doctor foundation of Henan Polytechnic University(B2020-6,B2021-5)
主 题：Initial permeability Adsorption capacity Free adsorption Pore pressure Coal strain
摘 要：The variations of strain and permeability of coal were systematically studied through the physical simulation of N2 and water *** effects of fluid adsorption capacity and initial permeability on strain,permeability and the dominant effect of pore pressure were *** adsorption strain and strain rate of coal during water injection are significantly higher than those during N2 *** edge of free adsorption exists in the early phase of N2 and water injection,which is related to fluid *** this boundary,the strain rate and pore pressure are ***,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 *** water injection,this boundary is about half of water saturation of ***,the influence of pore pressure on permeability is complex,which is controlled by adsorption capacity and initial permeability of *** 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 ***,the permeability increases with increasing pore *** the initial permeability is relatively low,the pore pressure may have a dominant role in promoting fluid migration for the fluid with weak adsorption ***,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.
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