摘要
在分析松软煤层中钻孔塌孔、硬分层中成孔机理的基础上,提出利用高压脉冲水射流在硬分层或顶底板中钻孔,切至软分层提高瓦斯抽采率的新钻孔工艺。并基于高压脉冲射流破煤岩动力特性,分析计算了射流在松软煤层中切缝所需的射流压力及流量;研制出钻孔、切缝系统装置及工艺。在四川某煤矿的松软煤层进行了现场试验,应用结果表明钻孔深度是本煤层钻孔深度的2.7倍,平均单孔瓦斯的抽放纯量为0.19～0.26 m3/min,是采用原工艺钻孔的5.2倍以上。
Analyzed the mechanism of borehole collapse in soft seam and completed in hard seam.On that basis,provided a new way of drilling borehole,which was drilling borehole in hard seam,floor or roof and then slotting the coal with high pulsed pressure water jet.Based on the dynamic of the high pressure water jet,the pressure and flow rate of the water jet were calculated.Then the gas drainage system of high pressure pulsed water jet were developed and applied successfully in a typical mine with rich gas and low permeability in Sichuan Province.According to the results,the borehole length drilled by new technology is 2.7 times of the original.Besides,the gas flow of per drilling slotted by high pressure water jet is 0.19 ～ 0.26 m3 /min on average is 5.2 times of the original.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2010年第7期1115-1119,共5页
Journal of China Coal Society
基金
国家创新群体基金资助项目(50621403)
重庆市杰出青年基金资助项目(CSTC
2009BA6047)
重庆大学研究生科技创新基金资助项目(2001005B1B0010342)
关键词
高压脉冲水射流
瓦斯抽放
松软煤层
深长孔
high pressure pulsed water jet
gas drainage
soft seam
long borehole
