彭业升宋大钊,何志龙高勤琼

(1.永城煤电控股集团有限公司,河南省永城市,450016; 2.中国矿业大学安全工程学院,江苏省徐州市,221116; 3.河南能源化工集团贵州兴安煤业有限公司糯东煤矿,贵州省兴义市,561904)



三软煤层水力冲孔布孔参数确定及优化∗

彭业升1宋大钊1,2何志龙3高勤琼2

(1.永城煤电控股集团有限公司,河南省永城市,450016; 2.中国矿业大学安全工程学院,江苏省徐州市,221116; 3.河南能源化工集团贵州兴安煤业有限公司糯东煤矿,贵州省兴义市,561904)

摘 要为提高“三软”煤层水力冲孔瓦斯消突效果,采用COMSOL软件进行模拟以确定冲孔有效半径,结合现场试验及应用对布孔参数进行优化与检验。结果表明,冲煤量为0.5 t/m、0.75 t/m、1.0 t/m时,卸压范围分别为6.7 m、8.9 m、11.2 m,瓦斯抽采半径为3.2 m、4.5 m、5.3 m;根据糯东煤矿现场试验优化确定水力冲孔孔间距为9 m,区域效果检验瓦斯抽采浓度及流量由冲孔前的25％,0.08 m3/min升至冲孔后85％,0.35 m3/ min,确定布孔参数合理可靠。

关键词“三软”煤层 水力冲孔 抽采半径 卸压范围 冲煤量

The parameters determination and optimization of hole arrangement to hydraulic flushing in the three soft coal seam

Peng Yesheng1,Song Dazhao1,2,He Zhilong3,Gao Qinqiong2
(1.Yongcheng Coal and Power Holding Group Co.,Ltd.,Yongcheng,Henan 450016,China; 2.College of Safety Engineering,China University of Mining& Technology,Xuzhou,Jiangsu 221116,China; 3.Nuodong Coal Mine,Guizhou Xing＇an Coal Industry Co.,Ltd.,Henan Energy& Chemical Group,Xinyi,Guizhou 561904,China)

Abstract In order to increase the effect of hydraulic flushing to eliminate gas outburst in the ＂three soft＂coal seam,the effective radius of hydraulic flushing was determined using the COMSOL software simulation,the parameters of hole arrangement were optimized and tested by combing the field experiments and application.The results show that the parameters of hole arrangement is determined by the analysis of the range of pressure relief and the radius of gas drainage,when the flushed coal quantity is 0.5 t/m,0.75 t/m,1.0 t/m respectively,the range of pressure relief is 6.7 m,8.9 m,11.2 m respectively,and the radius of gas drainage is 3.2 m,4.5 m,5.3 m respectively;According to the optimal results of field experiments,the pitch of holes to hydraulic flushing is 9 m,and the gas concentration and the gas flow rate to area effect testing increases from 25％,0.08 m3/min before hydraulic flushing to 85％,0.35 m3/min after hydraulic flushing respectively,which shows the parameter of hole arrangement is reasonable and reliable.

Key words ＂three soft＂coal seam,hydraulic flushing,the radius of gas drainage,the range of pressure relief,the flushed coal quantity

三软煤层一般具有低透气性、易流变、不易抽采的特性,在生产过程中,容易导致煤与瓦斯突出事故,瓦斯灾害威胁严重.水力冲孔技术对无保护层开采、应力高、透气性差的高瓦斯煤层具有良好的卸压增透、煤层消突效果,而水力冲孔效果的好坏关键在于冲孔技术参数的确定.

目前,我国众多学者对煤层水力冲孔技术参数优化进行了大量研究并取得了一定的研究成果.魏建平等应用压力法与流量法相结合的技术,分析……