低阶厚煤层立体分层抽采瓦斯技术及应用
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摘要
低煤阶煤层气资源受到了越来越多的关注,有望成为新的研究热点和煤层气勘探开发新领域。基于神东煤炭集团保德煤矿主采的8号煤层属典型的结构复杂低阶厚煤层的特点,开展了低阶厚煤层立体分层抽采瓦斯技术的研究。通过对矿井原有封孔工艺的改进,应用煤矿井下钻孔抽采瓦斯效果预测平台,优化8号煤层回采工作面瓦斯预抽钻孔的布孔工艺,进一步应用井下双向立体交错钻孔联合抽采瓦斯工艺实施回采前的工作面瓦斯治理,使之形成立体分层抽采瓦斯的格局。工程应用结果表明,应用低阶厚煤层立体抽采瓦斯技术可有效降低煤层瓦斯含量,使工作面实现回采前的瓦斯抽采达标。试验期间,累计抽采瓦斯量1 651.93万m~3,瓦斯的预抽率达58.96%。
Low rank coalbed methane resources have attracted more and more attention,and are expected to become a new research hotspot and a new field of coalbed methane exploration and development.Based on the characteristics of No.8 coal seam in Baode Coal Mine of Shendong Coal Group,which is a typical low-rank thick coal seam with complex structure,the gas extraction technology of low-rank thick coal seam by three-dimensional stratification was studied.Through the improvement of the original sealing technology,the gas drainage effect prediction platform was applied to optimize the hole layout technology of gas pre-drainage boreholes in No.8 coal seam mining face,and the gas control of the working face before mining is further implemented by the underground two-way and three-dimensional staggered boreholes combined with gas drainage technology.Engineering application results showed that,the application of low-rank thick coal seam stereoscopic gas extraction technology can effectively reduce the gas content of coal seam,and make the face meet the gas extraction standards before mining.During the test period,the total gas extraction amount was 16 519.3 thousand cubic metre,and the pre extraction rate of gas was 58.96%.
Low rank coalbed methane resources have attracted more and more attention,and are expected to become a new research hotspot and a new field of coalbed methane exploration and development.Based on the characteristics of No.8 coal seam in Baode Coal Mine of Shendong Coal Group,which is a typical low-rank thick coal seam with complex structure,the gas extraction technology of low-rank thick coal seam by three-dimensional stratification was studied.Through the improvement of the original sealing technology,the gas drainage effect prediction platform was applied to optimize the hole layout technology of gas pre-drainage boreholes in No.8 coal seam mining face,and the gas control of the working face before mining is further implemented by the underground two-way and three-dimensional staggered boreholes combined with gas drainage technology.Engineering application results showed that,the application of low-rank thick coal seam stereoscopic gas extraction technology can effectively reduce the gas content of coal seam,and make the face meet the gas extraction standards before mining.During the test period,the total gas extraction amount was 16 519.3 thousand cubic metre,and the pre extraction rate of gas was 58.96%.
引文
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[2] 程波,向真才,郭恒,等.煤岩材料对瓦斯吸附性能的研究进展[J].材料导报,2018,32(9):1513-1518.Cheng Bo,Xiang Zhencai,Guo Heng,et al.Research progress on gas adsorption performance of coal and rock materials[J].Materials Review,2018,32(9):1513-1518.
[3] 程波.含瓦斯煤渗流模型的研究现状及发展方向[J].矿业安全与环保,2017,44(5):93-97.Cheng Bo.Research status and development direction of gas seepage model of gas containing coal[J].Mining Safety & Environmental Protection,2017,44(5):93-97.
[4] 程波,熊云威.煤体瓦斯扩散系数测定方法的研究进展[J].矿业安全与环保,2018,45(2):106-110.Cheng Bo,Xiong Yunwei.Research progress in determination method of gas diffusion coefficient of coal body[J].Mining Safety & Environmental Protection,2018,45(2):106-110.
[5] 程波,马代辉,高月.煤的灰分、挥发分与孔隙率的关联及其对瓦斯放散初速度的影响[J].矿业安全与环保,2017,44(1):12-17.Cheng Bo,Ma Daihui,Gao Yue.Correlation of ash,volatile matter and porosity of coal and its influence on initial velocity of gas emission[J].Mining Safety & Environmental Protection,2017,44(1):12-17.
[6] 李国富,何辉,刘刚,等.煤矿区煤层气三区联动立体抽采理论与模式[J].煤炭科学技术,2012,40(10):7-11.Li Guofu,He Hui,Liu Gang,et al.The theory and model of three-zone linkage mining in coalbed methane in coal mining area[J].Coal Science and Technology,2012,40(10):7-11.
[7] 袁亮,郭华,沈宝堂,等.低透气性煤层群煤与瓦斯共采中的高位环形裂隙体[J].煤炭学报,2011,36(3):357-365.Yuan Liang,Guo Hua,Shen Baotang,et al.Circular overlying zone at longwall panel for efficient methane capture of mutiple coal seams with low permeability[J].Journal of China Coal Society,2011,36(3):357-365.
[8] 卢平,袁亮,程桦,等.低透气性煤层群高瓦斯采煤工作面强化抽采卸压瓦斯机理及试验[J].煤炭学报,2010,35(4):580-585.Lu Ping,Yuan Liang,Cheng Hua,et al.Theory and experimental studies of enhanced gas drainage in the high-gas face of low permeability coal multi-seams[J].Journal of China Coal Society,2010,35(4):580-585.
[9] 涂敏.低渗透性煤层群卸压开采地面钻井抽采瓦斯技术[J].采矿与安全工程学报,2013,30(5):766-772.Tu Min.Gas drainage technology for ground drilling in pressure relief mining of low permeability coal seam group[J].Journal of Mining and Safety Engineering,2013,30(5):766-772.
[10] 袁亮.低透气煤层群首采关键层卸压开采采空侧瓦斯分布特征与抽采技术[J].煤炭学报,2013,38(12):1362-1367.Yuan Liang.Gas distribution characteristics and extraction technology of the goaf side of the first layer of low-ventilation coal seam group for pressure relief mining[J].Journal of China Coal Society,2013,38(12):1362-1367.
[11] 雷毅,申宝宏,刘见中.煤矿区煤层气与煤炭协调开发模式初探[J].煤矿开采,2013,17(3):1-4.Lei Yi,Shen Baohong,Liu Jianzhong.Study on coordinated development mode of coalbed methane and coal in coal mine area[J].Coal Mining,2013,17(3):1-4.
[12] 田文广,李五忠,周远刚,等.煤矿区煤层气综合开发利用模式探讨[J].天然气工业,2008,28(3):87-89.Tian Wenguang,Li Wuzhong,Zhou Yuangang,et al.Discussion on comprehensive development and utilization mode of coalbed methane in coal mining area[J].Natural Gas Industry,2008,28(3):87-89.
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