太原理工大学学报2024，Vol.55Issue(2)：276-286,11.DOI:10.16355/j.tyut.1007-9432.20230536
热流固耦合作用下滑脱效应对煤岩低温渗透性的影响
Influence of Slippage Effect on the Low Temperature Permeability of Coal Rock Under the Action of Heat Flow Solid Coupling
摘要
Abstract
[Purposes]Increasing the permeability of coal reservoirs is a key technology to improve the recovery rate of coalbed methane,and in-situ thermal injection mining is an effective method to en-hance coalbed methane production.[Methods]In order to explore the change rule of coal reservoir permea-bility under the coupling of heat,fluid,and solid,pyrolysis seepage experiments of anthracite with differ-ent burial depths and temperatures were conducted,and theoretical analysis and research were conducted on the experimental results.[Findings]The results showed that:1)Under three-dimensional effective stress,the permeability of pyrolysis anthracite varies with temperature and pore pressure in a"V"shape,with a significant rebound phenomenon,which decreases with the increase of burial depth.When the pore pressure is less than the critical pore pressure and the temperature is lower than 70℃,the permeability of the coal body mainly depends on the slippage effect.When the pore pressure is greater than the critical pore pressure and the temperature is higher than 70℃,the permeability mainly depends on thermal expan-sion and the opening degree of pore pressure on the fracture,and the impact of thermal stimulation on the permeability is much greater than that of pore pressure.2)The critical pore pressure is between 1 and 1.5 MPa,the influence of slippage effect on permeability gradually decreases with the increase of tempera-ture,and the gradient of influence reduction increases with the increase of burial depth.3)The fracture opening coefficient increases with the increase of temperature and burial depth,but the higher the tempera-ture,the smaller the change in the sensitivity of permeability to pore pressure under different burial depths.[Conclusions]These research results further enrich the theory of in-situ thermal injection mining of coal-bed methane,and provide valuable data reference for enhanced permeability of coalbed methane.关键词
煤储层渗透率/临界孔隙压力/热流固耦合/滑脱效应/原位注热开采/煤层气Key words
permeability/pore pressure/thermal fluid solid coupling/slippage effect/in-situ thermal injection mining/coalbed methane分类
能源科技引用本文复制引用
李明,孟巧荣,辛佳龙,张润华,李亚军,林峰,陈涛..热流固耦合作用下滑脱效应对煤岩低温渗透性的影响[J].太原理工大学学报,2024,55(2):276-286,11.基金项目
国家自然科学基金资助项目(51974191) （51974191）
山西省省筹资助回国留学人员项目(2021-059) （2021-059）
