大块煤样逐次降压解吸实验研究  

Experimental Study on Large Coal Sample Desorption under Successive Depressurization

作　　者：李来成[1] 傅雪海[1] 罗斌[2] 

机构地区：[1]中国矿业大学煤层气资源与成藏过程教育部重点实验室,江苏徐州221116 [2]江苏地质矿产设计研究院,江苏徐州221006

出　　处：《中国煤炭地质》2015年第9期18-21,共4页Coal Geology of China

基　　金：国家重点基础研究发展计划(973)项目(2009CB219605);国家自然科学基金地区项目(41362009)资助

摘　　要：为了揭示无烟煤储层降压排采过程中的解吸量、解吸率和解吸阶段,对采自沁水盆地晋城矿区寺河煤矿的3号无烟煤大块煤样在CH4压力2.5 MPa下吸附3 d,然后在2.0、1.5、1.0、0.7、0.5、0.3和0.1 MPa压力下连续进行7d的逐次带压解吸实验。结果表明,大块煤逐次降压解吸的解吸量是直接降压解吸的1.46倍;逐次压降各阶段累计解吸率与压力呈负指数关系,逐次降压至0.7、0.3 MPa时的累计解吸率分别为53.6%、75.2%;大块煤样逐次带压降压解吸阶段与煤储层实际排采的解吸阶段类似。研究成果对无烟煤储层递进降压设计具有一定的指导作用。To reveal anthracite reservoir depressurization CBM drainage process desorption volume, rate and stages, taking No. 3 anthracite large coal samples from Sihe coalmine, Jincheng mining area, Qinshui Basin carried out adsorption under methane pressure 2.5MPa for 3 days, then carried out continuous successive depressurization desorption experiment under 2.0, 1.5, 1.0, 0.7, 0.5, 0.3 and 0.1MPa pressure for 7 days. The result has shown that the desorbed volume from block coal under successive depressurization is 1.46 times than from direct depressurization. Negative exponential relationship has been presented between cumulative desorption rate of successive depressurization stages and pressure. Cumulative desorption rates of successive depressurization to 0.7, 0.3MPa are 53.5%, 75.2%respectively. Large coal sample staged successive depressurization desorption is similar to actual CBM drainage stages. The research result has certain guiding significance to anthracite reservoir progressive decompression design.

关 键 词：煤层气 逐次降压解吸 常压解吸 解吸率 解吸阶段 

分 类 号：P618.11[天文地球—矿床学]