有效应力和不同气体对煤的渗透性影响分析  

Experiment Study of the Influence of Effective Stress and Different Gases on Coal Permeability

作　　者：谷达圣[1,2] 鲜学福[1,2] 周军平[1,2] 王臣[1,2] 

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400030 [2]重庆大学资源及环境科学学院,重庆400030

出　　处：《地下空间与工程学报》2012年第6期1296-1301,共6页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金创新研究群体科学基金资助项目(50921063);重庆市院士基金项目(CSTC2010BC6006);重庆大学"211工程"三期创新人才培养计划建设项目(S-10220)

摘　　要：以南桐6号煤层制备的型煤试件为研究对象,利用自行研制的煤岩三轴渗流实验装置研究了有效应力以及吸附不同气体对煤岩渗透率的影响,对煤吸附不同气体后的渗透性的差异性进行了分析。试验结果表明:有效应力和煤岩渗透率成负相关的关系;在维持有效应力3 MPa的条件下,因吸附效应不同CH4通过煤的渗透率最高,CO2通过煤的渗透率最低,CO2/N2混合气体通过煤的渗透率居中。研究结果对注CO2提高不可开采煤层CH4采收率同时实现CO2地质封存具有指导意义。Taking the coal of Nantong coal seam No.6 as the experiment specimen,the experiment study of the influence of effective stress and different gas adsorption on the coal permeability was carried out on self-developed triaxial gas-seepage experimental device,and the change of coal permeability with different gases adsorbed was analyzed.The results show that coal permeability and effective stress have a negative correlation.In the condition of constant effective stress of 3MPa,the permeability of coal specimen was different with different gas adsorption,the coal specimen absorbing CH4 has the highest permeability,for CO2 it is the lowest,while for the mixture of gas CO2/N2 the permeability is medium.The research results have some significance for enhancing coal bed methane recovery and carbon dioxide sequestration by injection carbon dioxide into not minable coal bed.

关 键 词：有效应力 渗透率 吸附 注气开采 

分 类 号：TU451[建筑科学—岩土工程]