低透松软破碎厚煤层水力扩孔增透技术研究
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摘要
针对云南能投观音山煤矿一井C_5煤层地质条件复杂、瓦斯压力大、含量高、煤质松软、透气性差、抽采达标时间长等问题,结合高压水射流力扩孔的技术原理和特点,提出采用底板穿层钻孔"钻扩一体化"的增透技术措施,并在矿区内开展了试验研究。通过现场研究表明,采用"钻扩一体化"增透技术措施能有效提高单个钻孔的暴露面积,改变煤层裂隙及应力分布状态,扩孔后单孔瓦斯体积分数平均提高1.4倍,抽采量增加2.8倍,缩短穿层钻孔抽采达标时间。该试验的成功为与观音山煤矿类似矿井提高煤层透气性提供了依据。
The gas extraction of C_5 coal seam of No.1 Guanyinshan Coal Mine in Yunnan Province is difficult to implement because the mine has complicated geological conditions,high gas pressure,high gas content,soft coal seam,and low coal permeability. To solve the problem,this paper proposed a technology named"drilling and enlarging integration"which increases coal permeability by drilling holes from floor. The technology was implemented in Guanyinshan Mine as a case study. The results show that the exposed area of the drilling holes is increased and the distribution of coal fracture and stress is changed when using the drilling and enlarging integration. After reaming,the average gas concentration of single hole increased by 1.4 times and the drainage volume increased by 2.8 times,and the extraction time is shortened. The paper provides important reference for increasing coal permeability for mines similar to Guanyinshan Coal Mine.
The gas extraction of C_5 coal seam of No.1 Guanyinshan Coal Mine in Yunnan Province is difficult to implement because the mine has complicated geological conditions,high gas pressure,high gas content,soft coal seam,and low coal permeability. To solve the problem,this paper proposed a technology named"drilling and enlarging integration"which increases coal permeability by drilling holes from floor. The technology was implemented in Guanyinshan Mine as a case study. The results show that the exposed area of the drilling holes is increased and the distribution of coal fracture and stress is changed when using the drilling and enlarging integration. After reaming,the average gas concentration of single hole increased by 1.4 times and the drainage volume increased by 2.8 times,and the extraction time is shortened. The paper provides important reference for increasing coal permeability for mines similar to Guanyinshan Coal Mine.
引文
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[2]刘喜军.深井煤岩瓦斯动力灾害防治研究[J].煤炭科学技术,2018,46(11):69-75.LIU Xijun.Study on coal and rock gas dynamics disaster prevention and control in deep mine[J].Coal Science and Technology,2018,46(11):69-75.
[3]宁德义.我国煤矿瓦斯防治技术的研究进展及发展方向[J].煤矿安全,2016,47(2):161-165.NING Deyi.Research progress and development trend of coal mine gas prevention technology in China[J].Safety in Coal Mines,2016,47(2):161-165.
[4]徐景德,杨鑫,赖芳芳,等.国内煤矿瓦斯强化抽采增透技术的现状及发展[J].矿业安全与环保,2014,41(4):100-103.XU Jingde,YANG Xin,LAI Fangfang,et al.Present situation and development of permeability improvement technology for enhanced gas drainage in our coal mines[J].Mining Safety&Environmental Protection,2014,41(4):100-103.
[5]韩颖,宋德尚.低渗煤层高压水射流割缝增透技术试验研究[J].中国安全生产科学技术,2014,10(12):35-39.HAN Ying,SONG Deshang.Experimental study on permeability improvement technology by cutting seam using high pressure water jet in coal seam with low permeability[J].Journal of Safety Science and Technology,2014,10(12):35-39.
[6]马念杰,郭晓菲,赵希栋,等.煤与瓦斯共采钻孔增透半径理论分析与应用[J].煤炭学报,2016,41(1):120-127.MA Nianjie,GUO Xiaofei,ZHAO Xidong,et al.Theoretical analysis and application about permeability-increasing radius of drilling for simultaneous exploitation of coal and gas[J].Journal of China Coal Society,2016,41(1):120-127.
[7]王耀锋,何学秋,王恩元,等.水力化煤层增透技术研究进展及发展趋势[J].煤炭学报,2014,39(10):1945-1955.WANG Yaofeng,HE Xueqiu,WANG Enyuan,et al.Research progress and development tendency of the hydraulic technology for increasing the permeability of coal seams[J].Journal of China Coal Society,2014,39(10):1945-1955.
[8]韩衍,魏民涛,张进,等.单一松软突出煤层瓦斯治理实践[J].矿业安全与环保,2014,41(5):76-78.HAN Yan,WEI Mintao,ZHANG Jin,et al.Practice of gas control in single soft outburst coal seam[J].Mining Safety&Environmental Protection,2014,41(5):76-78.
[9]张超,李树刚,林海飞,等.低透气性煤层钻射一体化瓦斯抽采技术研究与应用[J].安全与环境学报,2016,16(4):165-167.ZHANG Chao,LI Shugang,LIN Haifei,et al.Study and application of the drill-shooting integrated technology to the thickly contented gas and low air permeated coal seams[J].Journal of Safety and Environment,2016,16(4):165-167.
[10]施连海,李永和,郭洪峰,等.高压水射流径向水平井钻井技术[J].石油钻探技术,2016,29(5):21-22.SHI Lianhai,LI Yonghe,GUO Hongfeng,et al.Radial horizontal drilling techniques with high pressure water Jet[J].Petroleu Drilling Techniques,2016,29(5):21-22.
[11]孟贤正,何清,夏永军,等.新型高压水扩孔钻具的研制及其应用[J].矿业安全与环保,2008,35(S1):1-3.MENG Xianzheng,HE Qing,XIA Yongjun,et al.Development and application of a new high pressure water reaming drill tool[J].Mining Safety&Environment Protection,2008,35(S1):1-3.