低透气性煤层多组分酸化压裂增透技术研究  

Study on antireflection technology of multi-component acid fracturing in low permeability coal seam

作　　者：贾男 JIA Nan(CCTEG Shenyang Research Institute,Fushun 113122,China;State Key Laboratory of Coal Mine Safety Technology,Fushun 113122,China)

机构地区：[1]中煤科工集团沈阳研究院有限公司,辽宁抚顺113122 [2]煤矿安全技术国家重点试验室,辽宁抚顺113122

出　　处：《矿业安全与环保》2021年第3期27-32,共6页Mining Safety & Environmental Protection

基　　金：国家科技重大专项项目(2016ZX05045004-001);中煤科工集团沈阳研究院有限公司创新引导项目(SYYD-20WS-005)。

摘　　要：为了解决富含碳酸盐类矿物煤层透气性差的问题,提出多组分酸化压裂增透技术。通过实验室测试煤样酸化前后渗透率的变化,确定了适用于三元煤矿的压裂酸液配比:w(HCl)为9%+w(CH 3COOH)为3%+ρ(KCl)为20 g/L。现场工业试验结果表明,三元煤矿采用多组分酸化压裂后,抽采瓦斯混合流量和瓦斯浓度比普通抽采钻孔平均提高了1.34倍和1.70倍。对比传统水力压裂增透技术,多组分酸化压裂通过物理增透和化学增透的联合作用,更有利于煤体孔隙裂隙网络结构的发育,且反应生成的二氧化碳对瓦斯产生了驱替作用,有利于瓦斯抽采;同时扩大钻孔孔径可以有效提高压裂接触面和抽采自由面面积,进一步提高增透抽采效果。In order to solve the problem of poor permeability of coal seam rich in carbonate minerals,the antireflection technology of multi-component acid fracturing was proposed.Through the laboratory test of permeability changes of coal samples before and after acidizing,the acid ratio suitable for Sanyuan Coal Mine was w(HCl)=9%+w(CH 3COOH)=3%+ρ(KCl)=20 g/L.The field industrial test results show that:after the multi-component acid fracturing is adopted in Sanyuan Coal Mine,the mixed flow and concentration of the gas drainage are increased by 1.34 times and 1.70 times respectively on average compared with that of the ordinary drilling.Compared with the traditional antireflection technology of hydraulic fracturing,through the combination of physical and chemical antireflection,multi-component acid fracturing is more conducive to the development of pore fracture network structure of coal mass,and the carbon dioxide produced by reaction has a displacement effect on gas,which is conducive to gas drainage;at the same time,expanding the drilling diameter can effectively improve the area of high-pressure fracture contact surface and drainage free surface,and further improve the effect of antireflection drainage.

关 键 词：低透气性煤层 碳酸盐类矿物 多组分酸化压裂 水力压裂 大孔径 渗透率 

分 类 号：TD712.6[矿业工程—矿井通风与安全]