Experimental Study on Permeability Change Rule of Non-supercritical CO2 Replacing CH4 under THM Coupling Action

摘要：

To improve the coalbed methane production in low permeability coal seams has become a key problem need to be solved during the exploitation.The gas injection method is effective way of improving low permeability coalbed methane production during the process of accelerating methane desorption.According to the characteristics of methane migration in low permeability buried deeply coal seams in higher ground stress, geothermal and pore pressure conditions which led to a more outstanding influence of coupled THM action on CO2 storage effect and the adsorption — desorption — replacement — diffusion — seepage procedure of CH4/CO2, carried on the coal sample seepage experiment in different temperature, pore pressure and effective volume stress conditions, the results showed that; when CO2 is in the non - supercritical state that the temperature and pressure are both below the critical state, the density and dynamic viscosity both presented a exponent change rule with temperature and presented a linear increasing change rule with pressure; the permeability presented a exponent increasing trend with temperature, a positive exponent increasing trend with pore pressure and a negative exponent trend with effective volume stress, the research above provided a theory basis for Chinas seal of C02 underground and high efficient utilization of CH4 in coal seams.

关键词： thermo-hydro-mechanical coupled temperature pore pressure effective volume stress permeability dynamic viscosity

作者: Sun Keming Chen zhiyu Moj Raj Bagale Tan jian Ren Shuo Wu Di Yue Lixin Zhang Shucui

作者单位: Department of Mechanics and Engineering Sciences,Liaoning Technical University,Fuxin,Liaoning,123000,China

会议类型: 国际会议

会议名称: the 4th International Symposium on Mine Safety (2012) 第四届国际矿山安全学术研讨会(2012)

会议地点: 阜新

会议语种:英文

页码: 88-93

在线出版日期: 2012-08-04（万方平台首次上网日期，不代表论文的发表时间）