封闭空间煤心固碳过程CO_(2)吸附-运移特征  

Properties of CO_(2) adsorption and migration during carbon sequestration in confined spaces

作　　者：司小昆 SI Xiaokun(School of Traffic Engineering,Huanghe Jiaotong University,Jiaozuo 454000,China)

机构地区：[1]黄河交通学院交通工程学院,河南焦作454000

出　　处：《煤矿安全》2024年第4期26-32,共7页Safety in Coal Mines

基　　金：金属矿山高效开采与安全教育部重点实验室开放基金资助项目(201904)。

摘　　要：煤储层注CO_(2)过程中,CO_(2)的扩散和吸附进展缓慢,不同注气压力下吸附-运移时效特征对设计煤层封存CO_(2)具有重要影响。因此,采用双能X射线CT扫描,并计算分析了煤储层在围压下注气前后煤心密度变化和CO_(2)浓度。研究结果表明:在煤心的不同区域,气体以不同的速度运移,扩散和吸附进展缓慢;煤心中平均CO_(2)浓度随时间和CO_(2)注入压力的增加而增加,CO_(2)浓度从注气端向出口段沿煤心轴向几乎单调下降;煤心中CO_(2)浓度分布不均匀,煤心密度较高区域CO_(2)浓度越低(矿物质影响),煤基质密度较小处CO_(2)浓度越高。During the process of injecting CO_(2) into coal reservoirs,the diffusion and adsorption of CO_(2) are slow process,and the adsorption and migration time characteristics under different injection pressures have a significant impact on the design of coal seam CO_(2) storage.Therefore,dual energy X-ray CT scanning was used to calculate and analyze the changes of coal core density and CO_(2) concentration before and after gas injection in coal reservoirs under confining pressure.The results show that in different regions of coal core,gas migrates at different speed conditions,and diffusion and adsorption progress are slow.The average CO_(2) concentration in the coal core increases with the increase of time and CO_(2) injection pressure,and the CO_(2) concentration almost monotonically decreases along the axial direction of coal core from gas injection end to outlet section.The distribution of CO_(2) concentration in coal core is uneven.The lower the CO_(2) concentration in areas with high core density(mineral influence)is,the higher the CO_(2) concentration in areas with low coal matrix density is.

关 键 词：CO_(2)吸附 煤储层 CO_(2)封存 CO_(2)运移 注气压力 围压 CT扫描 

分 类 号：TD713[矿业工程—矿井通风与安全]