摘要
为了提升煤层瓦斯抽采效率,减少矿井瓦斯抽采工程量和抽采时间,讨论了水力冲压卸压增透机制,详细阐述了水力冲压卸压增透技术的工程实施模式,并将该技术应用于贵州新田煤矿煤巷条带瓦斯治理工作中,监测技术实施前后钻孔瓦斯抽采参数,数据分析结果表明:水力冲孔孔洞最大半径在0.23～0.72 m,水力压裂时的煤层破裂压力在13～26 MPa,冲孔后的平均瓦斯抽采体积分数提高了35%左右、瓦斯抽采纯量提高了1.1～5.0倍,冲压一体化作业后,钻场抽采浓度相较于冲孔后提高了0.8倍以上,钻场抽采纯量再次提高了3～5倍,卸压增透效果较为显著。工程试验结果证明水力冲压卸压增透技术能够实现煤层卸压增透,大幅提升煤层瓦斯抽采效率,对矿井安全高效生产有着重要的工程意义。
This paper is dedicated to improve efficiency of coal seam gas extraction,shorten engineering workload,and reduce gas extraction time through a new gas extraction technology which applies hydraulic stamping and pressure relief to increase permeability.The mechanism of hydraulic stamping and hydraulic pressure relief to increase permeability and the detailed description of the engineering implementation model are discussed.A case study of the gas extraction technology is explored,which was carried out in Xintian Coal Mine,Guizhou Province of China.Gas extraction parameters were monitored before and after the application of the technology.The results show that the maximum radius of the hydraulic punching hole is between 0.23 m and 0.72 m and the fracturing pressure of the coal seam is between 13 MPa and 26 MPa.It is also found that the average gas extraction concentration is increased by about 35%and the pure quantity of gas drainage is improved by 1.1 to5.0 times after hydraulic stamping.Moreover,gas extraction concentration is increased by over 0.8 times and pure quantity of gas drainage is improved by 3 to 5 times after integrating pressure relief to hydraulic stamping,which is due to permeability increaseby pressure relief.These results demonstrate that efficient gas extraction can be realized by implementing hydraulic stamping and pressure relief technology to increase permeability of coal seam.This technology has engineering significance in increasing mine safety and productivity.
作者
刘东
刘文
LIU Dong;LIU Wen(Yongcheng Coal and Electricity Group Co.,Ltd.,Yongcheng 470031,China;Henan Polytechnic University,Jiaozuo 454150,China;Henan Energy and Chemical Industry Group Co.,Ltd.,Zhengzhou 450046,China)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2019年第3期136-141,共6页
Coal Science and Technology
基金
国家自然科学基金资助项目(51504127)
关键词
水力冲孔
水力压裂
瓦斯抽采
卸压机制
hydraulic stamping
hydrofracture
gas extraction
pressure relief mechanism
