气相压裂增透技术在漳村煤矿的应用研究  

Application of gas fracturing and antireflection technology in Zhangcun Mine

作　　者：段思佳 Duan Sijia(Zhangcun Mine,Lu'cai Group,Changzhi 046000,China)

机构地区：[1]潞安集团漳村煤矿

出　　处：《煤炭与化工》2019年第11期107-111,114,共6页Coal and Chemical Industry

基　　金：国家自然科学基金资助项目(51274115);国家重点研发计划项目(2018YEC0807900)

摘　　要：针对高瓦斯低透煤层瓦斯抽采效果差、抽采成本高、抽采时间长等问题,通过在漳村煤矿应用气相压裂增透技术,来强化煤层的瓦斯抽采效果,实验和现场测试分析压裂前后煤样的孔隙裂隙基本参数变化情况,明确增透强化的机理。结果表明:①气相压裂煤层孔容和比表面积均以大孔为主;②在不同吸附平衡压力和粒径下,压裂煤层的扩散系数随着时间的增大而减小的幅度存在差异;③气相压裂后煤层孔隙裂隙基本参数都呈现增大的趋势,有利于缩短瓦斯扩散路径,提高瓦斯扩散系数;④气相压裂后,钻孔有效抽采半径、煤层透气性系数和渗透率分别提高了2.1~4.3倍、54~96倍和7.54-30.4倍,从而判定压裂煤层由原始难抽采煤层转化为易抽采煤层,气相压裂增透强化瓦斯抽采效果明显。Aiming at the problems of poor gas drainage effect,high drainage cost,and long drainage time in high gas and low permeability coal seams,the gas drainage fracturing and anti-reflection technology was applied in Zhangcun Mine to strengthen the gas drainage effect of coal seams.The field test analyzed the changes of the basic parameters of the pores and fissures of coal samples before and after fracturing,and clarifies the mechanism of antireflection enhancement.The results showed that①the pore volume and specific surface area of??gas fracturing coal seams were dominated by large pores;②under different adsorption equilibrium pressures and particle sizes,there was a difference in the decrease in the diffusion coefficient of fracturing coal seams with time③After gas fracturing,the basic parameters of coal seam pores and fissures all showed an increasing trend,which was conducive to shortening the gas diffusion path and increasing the gas difiusion coefficient;④after gas fracturing,the effective extraction radius of the borehole,the coal seam permeability coefficient and permeability,were increased by 2.1 to 4.3 times,54 to 96 times and 7.54 to 30.4 times respectively.Thus,it was determined that the fractured coal seam was transformed from the original difficult-to-drain coal seam to the easily-drainable coal seam.

关 键 词：低透煤层 气相压裂 孔隙裂隙 有效抽采半径 透气性系数 

分 类 号：TD712.6[矿业工程—矿井通风与安全]