“三软”低透气性煤层水力冲孔增透效果分析与评价  

Analysis and Evaluation of Permeability Improvement Effect with Hydraulic Flushing Borehole in "Three-soft" Low Permeability Coal Seam

作　　者：李雷 周少玺 LI Lei;ZHOU Shao-xi(Institute of Industrial Technology,Henan Polytechnic University,Jiaozuo 454000,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Yanghe Coal Mine,Zhengzhou Coal Industry Group Co.,Ltd.,Zhengzhou 452382,China)

机构地区：[1]河南理工产业技术研究院有限公司,河南焦作454000 [2]河南理工大学能源科学与工程学院,河南焦作454000 [3]郑州煤炭工业(集团)杨河煤业有限公司,郑州452382

出　　处：《煤炭技术》2021年第9期90-93,共4页Coal Technology

基　　金：NSFC-河南联合基金重点项目资助(U1904210);国家自然科学基金资助(51874121;51674102);河南省高校基本科研业务费专项资金资助(NSFRF180104);河南省重点科技攻关计划资助(182102310002)。

摘　　要：为研究水力冲孔对"三软"低透气性煤层的增透效果,提高"三软"煤层瓦斯抽采率,根据某矿的实际条件进行了"三软"煤层水力冲孔试验,并采用测试钻孔瓦斯抽采浓度和纯流量以及瓦斯抽采有效影响半径的方法,对该矿的水力冲孔效果进行了分析与评价,结果表明:对于该矿"三软"煤层,采用水力冲孔措施之后,瓦斯抽采浓度和纯流量最大增加了2.4倍和9.22倍,15 d内的瓦斯抽采有效影响半径由之前的2 m提高到了4~5 m,透气性系数由之前的0.005 4 m^(2)/MPa^(2)·d增加到0.053 m^(2)/(MPa^(2)·d),水力冲孔对"三软"煤层透气性系数的增加起到了较好的效果,提高了瓦斯的抽采效率。In order to study the effect of hydraulic punching on the "three soft" low permeability coal seams and improve the gas extraction rate of the "three soft" coal seams, according to actual geological conditions, have the test of hydraulic punching borehole in the "three soft" coal seam, analyse and evaluate the effect of hydraulic punching borehole in the mine by analysis the gas extraction concentration, rate of pure flow and effective radius of the gas extraction,the result showed that in the "three soft" coal seam of the mine, after the hydraulic punching technology was adopted, the gas extraction concentration and the rate of pure flow increased by the maximum of 2.4 times and 9.22 times;the effective radius of the gas extraction within 15 days was increased from 2 m to 4 to 5 m, the coefficients of gas permeability was increased from 0.005 4 m^(2)/(MPa^(2)·d) to 0.053 m^(2)/(MPa^(2)·d). So can draw the conclusion that hydraulic punching borehole can improve the coefficient of gas permeability of the "three-soft" coal seam and enhance the gas extraction efficiency.

关 键 词：“三软”煤层 低透气性 水力冲孔 效果分析评价 

分 类 号：TD713[矿业工程—矿井通风与安全]