单一低透煤层水力压裂增透技术试验  

Experimental study on hydraulic fracturing permeability improvement technology in single and low permeability coal seam

作　　者：陈学习[1] 金文广[1] 张晓伟 

机构地区：[1]华北科技学院安全学院,北京101601 [2]国投河南新能开发有限公司,河南郑州451100

出　　处：《辽宁工程技术大学学报（自然科学版）》2014年第11期1453-1456,共4页Journal of Liaoning Technical University (Natural Science)

基　　金：国家"十二五"科技支撑计划项目(N0:2013BAA03B02);教育部新世纪优秀人才支持计划基金资助项目(NCET-11-0837);中央高校基本科研业务基金资助项目(3142014012;3142013110);安全技术及工程(煤矿安全)省级重点学科(HSKJZD201401)

摘　　要：针对单一低透煤层瓦斯抽采浓度低、衰减快、瓦斯抽采困难等问题,提出了水力压裂增透技术.研究了水力压裂钻孔壁煤体起裂所需最小注水压力,分析了水力压裂过程中注水压力、流量等参数随注水时间动态变化特点,并对压裂前后煤层透气性系数变化和瓦斯抽采效果进行了考察.结果显示:实施水力压裂后,影响区内煤层透气性系数提高了20.32倍,平均瓦斯抽采浓度和纯量分别提高了4.1倍和5.1倍,水力压裂增透效果显著.According to the low concentration of gas extraction and fast attenuation in single and low permeability coal seam, the hydraulic fracturing permeability improvement technology was proposed to solve the problem of gas extraction. The minimum pressure required for cracking the hydraulic fracturing borehole was researched, and the change of parameters such as pressure and flow in the fracturing process with time was analyzed. The change of permeability coefficient in coal seam before and after fracturing was investigated, and also the effect of the gas extraction. The results show that the permeability coefficient, the concentration and the scalar quantity of gas extraction increased 20.32 times, 4.1 times and 5.1 times respectively. The effect of the technology is remarkable.

关 键 词：煤层 水力压裂 增透技术 瓦斯抽采 起裂压力 单一低透 衰减速度 透气性 

分 类 号：TD822[矿业工程—煤矿开采]