煤矿安全2024，Vol.55Issue(8)：16-24,9.DOI:10.13347/j.cnki.mkaq.20230954
多因素耦合作用和循环围压对煤岩CH4渗透率的影响研究
Study on the effects of multi-factor coupling and cycling confining pressure on the permeability of CH4 in coal rock
摘要
Abstract
The permeability of coal reservoirs is affected by its inherent properties,temperature,stress state,etc.Taking the 13-1 coal seam of Huainan Liuzhuang Coal Mine as the research object,the variation of CH4 permeability under the coupling of volume stress,temperature and gas pressure,and under cyclic confining pressure were studied based on the CH4 permeability test.The results show that the CH4 permeability of coal affected by the coupling of volume stress and gas pressure mainly controlled by the effective stress,and the greater the effective stress is,the lower the permeability is.The effect of gas pressure on CH4 permeability is limited by volume stress,but gas pressure has a greater effect on CH4 permeability than volume stress.The influence of temperature and gas pressure coupling on CH4 permeability is dominated by gas pressure.Permeability decreases with the increase of gas pressure show-ing a type of"U slide",and the"slide"change is more obvious than the"U"change.The influence of gas pressure on CH4 per-meability is greater than that of temperature,and the increasing gas pressure will reduce the influence of temperature on permeability.The cyclic confining pressure will cause irreversible plastic deformation of the pore fractures,which reduces effective seepage chan-nels in the coal and decreases CH4 permeability.The plastic deformation produced by the first cyclic confining pressure is the largest,and the amount of plastic deformation gradually decreases with the increase of the number of cycles.关键词
CH4 渗透率/耦合作用/体积应力/温度/气体压力/循环围压Key words
permeability of CH4/coupling/volume stress/temperature/gas pressure/cyclic confining pressure分类
矿业与冶金引用本文复制引用
祝月,徐宏杰,唐明云,刘会虎,杨祎超,卢宏伟..多因素耦合作用和循环围压对煤岩CH4渗透率的影响研究[J].煤矿安全,2024,55(8):16-24,9.基金项目
安徽省自然科学基金资助项目(2108085MD134) （2108085MD134）
安徽省重点研究和开发计划基础领域资助项目(2023z04020001) （2023z04020001）
安徽省公益性地质工作资助项目(2023-g-1-21,2021-g-2-14) （2023-g-1-21,2021-g-2-14）
安徽理工大学研究生创新基金资助项目(2023cx2001) （2023cx2001）
