不同瓦斯抽采钻孔封孔工艺封孔效果的现场试验对比研究
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摘要
为了考察不同封孔工艺在低渗透煤层中的瓦斯抽采效果,通过现场瓦斯抽采试验,对比分析了传统封孔、自胀式封孔、袋装封孔、封孔器封孔以及主动承压式封孔5种封孔工艺的钻孔瓦斯浓度变化特征,介绍了主动承压式封孔工艺的工艺原理。结果表明:主动承压式封孔工艺的钻孔瓦斯浓度在抽采初期呈上升趋势,随后缓慢降低并稳定在70%左右,钻孔瓦斯浓度出现显著衰减的时间为70～80 d,高瓦斯浓度抽采的时间长达91 d,远高于相同条件下采用其他封孔工艺的抽采钻孔;此外,采用该封孔工艺的钻孔瓦斯浓度自孔底向孔口仅衰减14%,为各类封孔工艺中瓦斯浓度衰减最低的封孔方式。综合对比各类封孔工艺下抽采钻孔瓦斯浓度变化特征、瓦斯浓度显著衰减时间和高浓度瓦斯持续抽采时间等指标,采用主动承压式封孔工艺可以取得良好的瓦斯抽采效果。
In order to investigate the gas drainage effect of low-permeability coal seams with different sealing processes,the traditional gas sealing and self-expanding sealing,bag sealing,sealing and sealing are carried out through on-site gas drainage test.The variation of gas concentration in boreholes under five kinds of sealing methods of pressure-sealing were mainly introduced to the process principle of active pressure-sealing sealing process.The results showed that the gas concentration of drilling gas in active pressure-sealing sealing process was in the extraction.Initially,and it showed an upward trend,then slowly decreased and stabilized at around 70%.The time for significant attenuation of borehole gas concentration was about 70～80 d,and the extraction time of high gas concentration was as long as 91 d,much higher than other conditions under the same conditions.The drilling hole of the sealing process,in addition,the gas concentration of the drilling hole using the sealing process was only attenuated by 14% from the bottom of the hole to the orifice,which was the sealing method with the lowest attenuation of gas concentration in various sealing processes.Comprehensive comparison of various types of sealing technology,gas concentration variation characteristics,significant gas concentration reduction time and high concentration gas continuous extraction time and other indicators,the use of active pressure sealing method can achieve good gas drainage effect.
In order to investigate the gas drainage effect of low-permeability coal seams with different sealing processes,the traditional gas sealing and self-expanding sealing,bag sealing,sealing and sealing are carried out through on-site gas drainage test.The variation of gas concentration in boreholes under five kinds of sealing methods of pressure-sealing were mainly introduced to the process principle of active pressure-sealing sealing process.The results showed that the gas concentration of drilling gas in active pressure-sealing sealing process was in the extraction.Initially,and it showed an upward trend,then slowly decreased and stabilized at around 70%.The time for significant attenuation of borehole gas concentration was about 70～80 d,and the extraction time of high gas concentration was as long as 91 d,much higher than other conditions under the same conditions.The drilling hole of the sealing process,in addition,the gas concentration of the drilling hole using the sealing process was only attenuated by 14% from the bottom of the hole to the orifice,which was the sealing method with the lowest attenuation of gas concentration in various sealing processes.Comprehensive comparison of various types of sealing technology,gas concentration variation characteristics,significant gas concentration reduction time and high concentration gas continuous extraction time and other indicators,the use of active pressure sealing method can achieve good gas drainage effect.
引文
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[13] 刘延保,熊伟.顺层瓦斯抽采钻孔封孔提浓技术及应用[J].煤矿安全,2017,48(1):63-66.Liu Yanbao,Xiong Wei.Hole-sealing and gas concentrating technique for bedding gas extraction drilling hole and its application[J].Safety in Coal Mines,2017,48(1):63-66.
[14] 张建华,李振兴.深部低透煤层瓦斯抽采钻孔封孔方式研究[J].能源与环保,2019,41(4):80-83.Zhang Jianhua,Li Zhenxing.Study on sealing way of gas drainage borehole in deep low-permeability coal seam[J].China Energy and Environmental Protection,2019,41(4):80-83.
[15] 李辉,郭绍帅,肖云涛,等.几种常用封孔方式的工艺特点[J].煤矿机械,2015,36(11):151-153.Li Hui,Guo Shaoshuai,Xiao Yuntao,et al.Technical characteristics of several commonly used sealing holes[J].Coal Mine Machinery,2015,36(11):151-153.
[2] 张培,王文才.高瓦斯特厚煤层首采工作面瓦斯涌出分布特征研究[J].科学技术与工程,2017,17(2):176-180.Zhang Pei,Wang Wencai.Research on gas emission and distribution of the first face in high gas and thick seam[J].Science Technology and Engineering,2017,17(2):176-180.
[3] 梁国栋,郭建.我国煤矿瓦斯事故原因统计分析[J].能源与环保,2018,40(11):75-78.Liang Guodong,Guo Jian.Study on sealing way of gas drainage borehole in deep low-permeability coal seam[J].China Energy and Environmental Protection,2018,40(11):75-78.
[4] 于红,崔学锋,张瑞林.不同煤阶软硬煤粒瓦斯放散规律的实验研究[J].科学技术与工程,2018,18(1):212-217.Yu Hong,Cui Xuefeng,Zhang Ruilin.Experimental study on gas desorption law of soft coal particles with different coal rank[J].Science Technology and Engineering,2018,18(1):212-217.
[5] 王胜利,赵萌,秦汝祥.瓦斯抽采钻孔封孔效果考察及影响因素分析[J].能源与环保,2017,39(8):92-95.Wang Shengli,Zhao Meng,Qin Ruxiang.Analysis on sealing effect of gas extraction borehole and influencing factors[J].China Energy and Environmental Protection,2017,39(8):92-95.
[6] 杨晓东,张锋,李健威,等.低阶厚煤层立体分层抽采瓦斯技术及应用[J].能源与环保,2019,41(4):36-41.Yang Xiaodong,Zhang Feng,Li Jianwei,et al.Technology and application of three-dimensional stratified gas drainage in low order thick coal seam[J].China Energy and Environmental Protection,2019,41(4):36-41.
[7] 翟成,向贤伟,余旭,等.瓦斯抽采钻孔柔性膏体封孔材料封孔性能研究[J].中国矿业大学学报,2013,42(6):982-988.Zhai Cheng,Xiang Xianwei,Yu Xu,et al.Sealing performance of flexible gel sealing material of gas drainage borehole[J].Journal of China University of Mining & Technology,2013,42(6):982-988.
[8] 王兆丰,刘军.我国煤矿瓦斯抽放存在的问题及对策探讨[J].煤矿安全,2005,36(3):29-32.Wang Zhaofeng,Liu Jun.Problems and countermeasures of gas drainage in coal mines in China[J].Safety in Coal Mines,2005,36(3):29-32.
[9] 刘延保.瓦斯抽采钻孔封孔成套技术及应用研究[J].煤炭工程,2017,49(4):32-35.Liu Yanbao.Technological set of gas drainage drilling hole sealing and its application[J].Coal Engineering,2017,49(4):32-35.
[10] 王春光.炮掘扰动下瓦斯抽采孔护救促抽技术与应用[J].煤矿安全,2017,48(11):148-151.Wang Chunguang.Technology and application on gas extraction hole protection for promoting drainage under disturbing of blasting driving[J].Safety in Coal Mines,2017,48(11):148-151.
[11] 胡国忠,蓝昌金,何文瑞,等.瓦斯抽采钻孔注浆加固封孔过程中超高压水膨胀浆液的可注性研究[J].煤矿安全,2017,48(7):9-12.Hu Guozhong,Lan Changjin,He Wenrui,et al.Study on grout ability of super high-aqueous expansive slurry during hole sealing process of gas drainage holes[J].Safety in Coal Mines,2017,48(7):9-12.
[12] 范晓刚,马钱钱.王坡煤矿封孔质量检测装置的应用试验[J].煤矿安全,2019,50(1):133-135.Fan Xiaogang,Ma Qianqian.Application test of sealing quality testing device in Wangpo Coal Mine[J].Safety in Coal Mines,2019,50(1):133-135.
[13] 刘延保,熊伟.顺层瓦斯抽采钻孔封孔提浓技术及应用[J].煤矿安全,2017,48(1):63-66.Liu Yanbao,Xiong Wei.Hole-sealing and gas concentrating technique for bedding gas extraction drilling hole and its application[J].Safety in Coal Mines,2017,48(1):63-66.
[14] 张建华,李振兴.深部低透煤层瓦斯抽采钻孔封孔方式研究[J].能源与环保,2019,41(4):80-83.Zhang Jianhua,Li Zhenxing.Study on sealing way of gas drainage borehole in deep low-permeability coal seam[J].China Energy and Environmental Protection,2019,41(4):80-83.
[15] 李辉,郭绍帅,肖云涛,等.几种常用封孔方式的工艺特点[J].煤矿机械,2015,36(11):151-153.Li Hui,Guo Shaoshuai,Xiao Yuntao,et al.Technical characteristics of several commonly used sealing holes[J].Coal Mine Machinery,2015,36(11):151-153.