定向拦截钻孔施工技术研究及应用
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摘要
定向钻孔孔内失稳严重影响着其抽放效率,会导致覆盖区域内瓦斯抽放不彻底、煤体残余瓦斯含量较高的问题出现,在巷道掘进过程中,煤体冒落导致大量瓦斯瞬间释放,会造成回风流瓦斯浓度升高,存在重大安全隐患。针对这一问题提出了定向拦截钻孔施工方案,即避开失稳区域重新施工定向钻孔对原有钻孔形成有效拦截,为瓦斯产出创造新的通道。在寺河矿东井区5310工作面设计了3种不同方案进行了试验,同时基于覆盖煤体瓦斯抽放效率、巷道风排瓦斯量等指标对施工方案进行了优选。结果表明,分支居于不同层位的定向拦截钻孔覆盖区域煤体瓦斯抽放效率增幅最大,达到12.29%;同时巷道掘进过程中风排瓦斯量降幅最大,达到20.6%,证实了这一方案为最优方案。
The instability in directional drilling seriously affects the drainage efficiency,resulting in incomplete gas drainage and high residual gas content in the coverage area.In the tunneling process,there is a major safety hazard of instantaneous release of a large amount of gas and increasing gas concentration in the return airflow caused by coal body collapse.A directional interception drilling construction scheme was proposed,which could avoid the unstable area and reconstruct.The effective drilling is formed by the directional drilling to create a new channel for the gas.In the 5310 working face of eastern area of Sihe Mine,three different schemes were tested and were optimized based on some indicators,including gas drainage efficiency and the gas ventilation volume.The results show that,the gas drainage efficiency increases most to 12.29%in the coal body covered with boreholes with the directional interception at different levels;meanwhile,during the excavation process,the gas ventilation volume decreases most to 20.6%,which confirms the scheme optimal.
The instability in directional drilling seriously affects the drainage efficiency,resulting in incomplete gas drainage and high residual gas content in the coverage area.In the tunneling process,there is a major safety hazard of instantaneous release of a large amount of gas and increasing gas concentration in the return airflow caused by coal body collapse.A directional interception drilling construction scheme was proposed,which could avoid the unstable area and reconstruct.The effective drilling is formed by the directional drilling to create a new channel for the gas.In the 5310 working face of eastern area of Sihe Mine,three different schemes were tested and were optimized based on some indicators,including gas drainage efficiency and the gas ventilation volume.The results show that,the gas drainage efficiency increases most to 12.29%in the coal body covered with boreholes with the directional interception at different levels;meanwhile,during the excavation process,the gas ventilation volume decreases most to 20.6%,which confirms the scheme optimal.
引文
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[3]郝世俊.煤矿井下定向钻进技术的发展[J].煤田地质与勘探,2004,32(2):57-59,46.HAO Shijun.The Development of Horizontal Directional Drilling in Coal Mines[J].Coal Geology&Exploration,2004,32(2):57-59,46.
[4]王永龙,翟新献,孙玉宁.松软突出煤层钻孔护壁力学作用机理[J].安徽理工大学学报(自然科学版),2012,32(4):50-55.WANG Yonglong,ZHAI Xinxian,SUN Yuning.Analysis of Mechanism of Borehole Wall Protection in Soft Coal Seams with Outburst Threat[J].Journal of Anhui University of Science and Technology:Natural Science,2012,32(4):50-55.
[5]韩颖,张飞燕.煤层钻孔失稳机理研究进展[J].中国安全生产科学技术,2014,10(4):114-119.HAN Ying,ZHANG Feiyan.Progress in Research on Instability Mechanism of Coalbed Borehole[J].Journal of Safety Science and Technology,2014,10(4):114-119.
[6]杨磊,李义敬,张旭.煤层瓦斯抽采钻孔失稳的延迟效应分析[J].煤矿安全,2013,44(9):178-181.YANG Lei,LI Yijing,ZHANG Xu.Delayed Effect Analysis of Gas Extraction Boreholes Instability in Coal Seam[J].Safety in Coal Mines,2013,44(9):178-181.
[7]王振,梁运培,金洪伟.防突钻孔失稳的力学条件分析[J].采矿与安全工程学报,2008,25(4):444-448.WANG Zhen,LIANG Yunpei,JIN Hongwei.Analysis of Mechanics Conditions for Instability of Outburst-Preventing Borehole[J].Journal of Mining&Safety Engineering,2008,25(4):444-448.
[8]王中伟,许家林,吴仁伦.双尾巷在大采长综放面瓦斯治理中的应用[J].煤矿安全,2010,(433)23-26.
[9]陈凯,杨胜强,刘亚东.石港矿15109综放工作面初采期瓦斯涌出特征分析[J].煤矿安全,2012,43(12)157-160.CHEN Kai,YANG Shengqiang,LIU Yadong.Gas Emission Feature Analysis in No.15109Fully Mechanized Caving Face of Shigang Coal Mine During Initial Mining Period[J].Safety in Coal Mines,2012,43(12):157-160.
[10]宋卫华,李泽幼,韩延龙,等.高瓦斯综放工作面高抽巷合理层位的确定[J].煤炭科学技术,2017,45(4):72-76.SONG Weihua,LI Youze,HAN Yanlong,et al.Determination on Rational Layer Position of High Level Gas Drainage Gateway for High Gassy Fully-mechanized Top Coal Caving Mining Face[J].Coal Science and Technology,2017,45(4):72-76.