瓦斯抽采钻孔套管支护封孔技术研究
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摘要
针对因漏气通道的存在使得瓦斯抽采负压不能有效提高,抽采效果差的问题,对瓦斯抽采封孔技术进行研究.通过对钻孔周围应力场分布特征进行分析,确定了顺层钻孔漏气的原因,并利用COMSOL模拟软件模拟分析了封孔段在施加主动支护力作用下的钻孔漏气情况,采用了顺层钻孔"套管支护"封孔方法.在马堡煤矿进行现场应用.结果表明:套管固孔技术使钻孔得到有效支护,与未下套管的普通抽采钻孔相比,单孔瓦斯抽采混合流量提高了10倍左右,单孔瓦斯抽采浓度提高了1.6倍左右.研究结论有助于提高煤矿瓦斯抽采效率.
Aiming at the problem that the gas suction negative pressure can not be effectively improved due to the existence of the gas leakage passage and the poor drainage effect, the gas drainage sealing technology is studied. Based on the analysis of the distribution characteristics of the stress field around the borehole, the cause of the gas leakage in the bedding borehole is determined. And by simulating and analyzing the leakage of the borehole under the action of the active support force using COMSOL simulation software, a method of sealing the casing with a "sleeve support" is proposed. Field application at Marburg coal mine shows that the casing fixing technique can effectively support the drilling, and the single-hole gas drainage mixing flow rate is increased by about 10 times compared with the ordinary pumping drilling hole without the casing, and the concentration of single-hole gas extraction in single hole is increased by about 1.6 times. The research conclusions help to improve the efficiency of coal mine gas drainage.
Aiming at the problem that the gas suction negative pressure can not be effectively improved due to the existence of the gas leakage passage and the poor drainage effect, the gas drainage sealing technology is studied. Based on the analysis of the distribution characteristics of the stress field around the borehole, the cause of the gas leakage in the bedding borehole is determined. And by simulating and analyzing the leakage of the borehole under the action of the active support force using COMSOL simulation software, a method of sealing the casing with a "sleeve support" is proposed. Field application at Marburg coal mine shows that the casing fixing technique can effectively support the drilling, and the single-hole gas drainage mixing flow rate is increased by about 10 times compared with the ordinary pumping drilling hole without the casing, and the concentration of single-hole gas extraction in single hole is increased by about 1.6 times. The research conclusions help to improve the efficiency of coal mine gas drainage.
引文
[1]王明,方新秋,许瑞强,等.大孔径超长定向钻孔综合瓦斯抽采技术[J].煤炭工程,2011(5):2-3.WANG Ming,FANG Xinqiu,XU Ruiqiang,et al.comprehensive gas drainage technology for large-borehole and super-long directional borehole[J].Coal Engineering,2011(5):2-3.
[2]俞启香.矿井瓦斯防治[M].徐州:中国矿业大学出版社,1992.
[3]袁士杰,苏南,丁卢强.中心分流囊袋封孔法在瓦斯抽采中的研究应用[J].河南科技,2014(16):43-44.YUAN Shijie,SU Nan,DING Luqiang.The study of central shunt bag sealing method in gas extraction should be carried out[J].Journal of Henan Science and Technology,2014(16):43-44.
[4]闫彦光.瓦斯抽采钻孔封孔技术改进研究与应用[J].煤炭与化工,2015,38(1):111-113.YAN Yanguang.Research and application of gas extraction drilling hole sealing technology improvement.coal and chemical industry[J].Coal and Chemical Industry,2015,38(1):111-113.
[5]杨继东.顺层钻孔封孔深度确定及封孔工艺改进[J].中州煤炭,2014(8):59-61.YANG Jidong.Determination of drillholes along seam's depth and improvement of hole sealing technics[J].Zhongzhou Coal,2014(8):59-61.
[6]孙玉宁.本煤层瓦斯抽采成孔与封孔技术研究[D].焦作:河南理工大学,2008.
[7]王振锋,周英,孙玉宁,等.新型瓦斯抽采钻孔注浆封孔方法及封堵机理[J].煤炭学报,2015,40(3):588-595.WANG Zhengfeng,ZHOU Ying,SUN Yuning,et al.Novel gas extraction borehole grouting sealing method and sealing mechanism[J].Journal of China Coal Society,2015,40(3):588-595.
[8]唐辉.深井特厚煤层短壁工作面快速回采条件下瓦斯防治技术[J].矿业安全与环保,2017(4):2-3.TANG Hui.Gas control technology for fast winning of short-wall coal face of extra-think seam in deep Mine[J].Mining Safety&Environmental Protection,2017(4):2-3.
[9]李小明,李辉,魏国营.长套管带压封孔测压技术及应用[J].煤炭技术,2014,33(6):30-32.LI Xiaoming,LI Hui,WEI Guoying.Application of borehole pressurized sealing with double casing pipe in gas pressure testing.coal technology[J].Coal Technology,2014,33(6):30-32.
[10]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.
[11]郑其堂,魏风清.抽采钻孔封孔质量检测方法研究与应用[J].能源与环保,2014(8):43-45.ZHENG Qitang,WEI Fengqing.Research and application of drainage hole sealing quality testing method[J].China Energy and Environmental Protection,2014(8):43-45.
[2]俞启香.矿井瓦斯防治[M].徐州:中国矿业大学出版社,1992.
[3]袁士杰,苏南,丁卢强.中心分流囊袋封孔法在瓦斯抽采中的研究应用[J].河南科技,2014(16):43-44.YUAN Shijie,SU Nan,DING Luqiang.The study of central shunt bag sealing method in gas extraction should be carried out[J].Journal of Henan Science and Technology,2014(16):43-44.
[4]闫彦光.瓦斯抽采钻孔封孔技术改进研究与应用[J].煤炭与化工,2015,38(1):111-113.YAN Yanguang.Research and application of gas extraction drilling hole sealing technology improvement.coal and chemical industry[J].Coal and Chemical Industry,2015,38(1):111-113.
[5]杨继东.顺层钻孔封孔深度确定及封孔工艺改进[J].中州煤炭,2014(8):59-61.YANG Jidong.Determination of drillholes along seam's depth and improvement of hole sealing technics[J].Zhongzhou Coal,2014(8):59-61.
[6]孙玉宁.本煤层瓦斯抽采成孔与封孔技术研究[D].焦作:河南理工大学,2008.
[7]王振锋,周英,孙玉宁,等.新型瓦斯抽采钻孔注浆封孔方法及封堵机理[J].煤炭学报,2015,40(3):588-595.WANG Zhengfeng,ZHOU Ying,SUN Yuning,et al.Novel gas extraction borehole grouting sealing method and sealing mechanism[J].Journal of China Coal Society,2015,40(3):588-595.
[8]唐辉.深井特厚煤层短壁工作面快速回采条件下瓦斯防治技术[J].矿业安全与环保,2017(4):2-3.TANG Hui.Gas control technology for fast winning of short-wall coal face of extra-think seam in deep Mine[J].Mining Safety&Environmental Protection,2017(4):2-3.
[9]李小明,李辉,魏国营.长套管带压封孔测压技术及应用[J].煤炭技术,2014,33(6):30-32.LI Xiaoming,LI Hui,WEI Guoying.Application of borehole pressurized sealing with double casing pipe in gas pressure testing.coal technology[J].Coal Technology,2014,33(6):30-32.
[10]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.
[11]郑其堂,魏风清.抽采钻孔封孔质量检测方法研究与应用[J].能源与环保,2014(8):43-45.ZHENG Qitang,WEI Fengqing.Research and application of drainage hole sealing quality testing method[J].China Energy and Environmental Protection,2014(8):43-45.