井下大直径钻孔瓦斯抽采技术研究
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摘要
为研究面间煤柱内的大直径钻孔抽采采空区瓦斯效果,基于某矿实际生产条件及COMSOL数值模拟软件,依据上覆岩层运移理论、采空区顶板岩性、顶板垮落破坏特征对采空区孔隙率进行了分块赋值,COMSOL数值模拟研究结果表明:钻孔布置的最佳距离为8～10 m。考虑经济因素及顶板垮落步距的影响,钻孔布置的最佳距离应为10 m;靠近工作面上隅角处,采空区内瓦斯浓度呈中心高、四周低的圆环状分布,该低瓦斯浓度圆环的出现与大直径钻孔对采空区内瓦斯的抽采作用密切相关。ORIGIN数据拟合及计算表明:10 m钻孔间距条件下,控制上隅角瓦斯浓度不超限的钻孔最小瓦斯抽放量为5.4 m~3/min。该理论成果的成功运用,指导了该矿的生产安全。
In order to study the effect of gas extraction from goaf by large diameter boreholes in inter-face coal pillars,based on the actual production conditions of a mine and COMSOL numerical simulation software,the porosity of goaf was divided into blocks according to the theory of overlying strata migration,roof lithology of goaf and collapse failure characteristics.The results of COMSOL numerical simulation showed that the optimum distance of borehole layout was 8～10 m.Considering the influence of economic factors and roof caving step,the optimum distance of borehole layout should be 10 m.Near the upper corner of the working face,the gas concentration in the goaf distributes in a circle with high center and low circumference.The occurrence of the circle with low gas concentration was closely related to the gas drainage effect of large diameter boreholes in the goaf.ORIGIN data fitting and calculation showed that under the condition of 10 m borehole spacing,the minimum gas drainage volume of boreholes controlling gas concentration in upper corner was 5.4 m~3/min.Successful application of the theoretical results has guided the production safety of the mine.
In order to study the effect of gas extraction from goaf by large diameter boreholes in inter-face coal pillars,based on the actual production conditions of a mine and COMSOL numerical simulation software,the porosity of goaf was divided into blocks according to the theory of overlying strata migration,roof lithology of goaf and collapse failure characteristics.The results of COMSOL numerical simulation showed that the optimum distance of borehole layout was 8～10 m.Considering the influence of economic factors and roof caving step,the optimum distance of borehole layout should be 10 m.Near the upper corner of the working face,the gas concentration in the goaf distributes in a circle with high center and low circumference.The occurrence of the circle with low gas concentration was closely related to the gas drainage effect of large diameter boreholes in the goaf.ORIGIN data fitting and calculation showed that under the condition of 10 m borehole spacing,the minimum gas drainage volume of boreholes controlling gas concentration in upper corner was 5.4 m~3/min.Successful application of the theoretical results has guided the production safety of the mine.
引文
[1] 王志刚.高支架特殊工况下过冲刷带技术[J].煤矿安全,2014,45(3):86-87,91.Wang Zhigang.Technology of passing scour zone under special working conditions of high support[J].Safety in Coal Mines,2014,45(3):86-87,91.
[2] 张学亮.分层开采上分层综采工作面采空区瓦斯抽采技术优化[J].煤矿安全,2018,49(5):143-146.Zhang Xueliang.Optimization of gas extraction technology in goaf of fully-mechanized mining face with upper layer in slicing mining[J].Safety in Coal Mines,2018,49(5):143-146.
[3] 崔光俊,李桂臣,孙元田.突出危险煤层首采面采空区瓦斯抽采模拟分析[J].煤矿安全,2016,47(7):151-154,159.Cui Guangjun,Li Guichen,Sun Yuantian.Gas extraction simulation analysis of goaf in the first mining face of outburst dangerous coal seam[J].Safety in Coal Mines,2016,47(7):151-154,159.
[4] 梁冰,袁欣鹏,孙维吉.本煤层顺层瓦斯抽采渗流耦合模型及应用[J].中国矿业大学学报,2014,43(2):208-213.Liang Bing,Yuan Xinpeng,Sun Weiji.Coupled seepage model and its application for seam gas extraction along seam[J].Journal of China University of Mining and Technology,2014,43(2):208-213.
[5] 许江,苏小鹏,彭守建,等.卸压区不同钻孔长度抽采条件下瓦斯运移特性试验[J].岩土力学,2018,39(1):103-111,122.Xu Jiang,Su Xiaopeng,Peng Shoujian,et al.Gas migration characteristics test under different drilling length extraction conditions in pressure relief area[J].Geotechnical Mechanics,2018,39(1):103-111,122.
[6] 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.The mechanism and experiment of enhanced gas extraction and pressure relief in high gas mining face of low permeability coal seam group[J].Journal of China Coal Society,2010,35(4):580-585.
[7] 王旭锋,张东升,李国君,等.铁法矿区高瓦斯低透气性煤层群卸压煤层气抽采钻孔布置[J].煤炭学报,2011,36(8):1296-1301.Wang Xufeng,Zhang Dongsheng,Li Guojun,et al.Borehole layout of pressure relief CBM extraction for high gas and low permeability coal seams in Tiefa mining area[J].Journal of China Coal Society,2011,36(8):1296-1301.
[8] 胡延伟,孙路路,江城浩,等.基于COMSOL的采空区瓦斯抽采数值模拟研究[J].煤矿安全,2018,49(5):167-170,174.Hu Yanwei,Sun Lulu,Jiang Chenghao,et al.Study on numerical simulation of goaf gas extraction based on COMSOL[J].Safety in Coal Mines,2018,49 (5):167-170,174.
[9] 尹光志,李铭辉,李生舟,等.基于含瓦斯煤岩固气耦合模型的钻孔抽采瓦斯三维数值模拟[J].煤炭学报,2013,38(4):535-541.Yin Guangzhi,Li Minghui,Li Shengzhou,et al.Three-dimensional numerical simulation of gas extraction by drilling based on solid-gas coupling model of gas-bearing coal and rock[J].Journal of China Coal Society,2013,38(4):535-541.
[10] 李宏,马金魁.基于COMSOL Multiphysics模拟的瓦斯抽采钻孔合理间距研究[J].能源与环保,2018,40(12):1-5.Li Hong,Ma Jinkui.Research on reasonable spacing of gas drainage boreholes based on COMSOL Multiphysics simulation[J].China Energy and Environmental Protection,2018,40(12):1-5.
[11] 蒋静晓,李治理.基于COMSOL的钻孔有效抽采半径变化规律研究与工程应用[J].能源与环保,2018,40(7):58-63.Jiang Jingxiao,Li Zhili.Research on changing regularity of effective mining radius based on COMSOL and its engineering application[J].China Energy and Environmental Protection,2018,40(7):58-63.
[12] 徐玉胜,李春元,张勇.大采高采场“U”型通风系统采空区大流量瓦斯抽采技术[J].煤矿安全,2018,49(9):100-104.Xu Yusheng,Li Chunyuan,Zhang Yong.Large-flow gas extraction technology of "U" ventilation system in goaf of large mining height stope[J].Safety in Coal Mines,2018,49(9):100-104.
[13] 袁亮,郭华,李平,等.大直径地面钻井采空区采动区瓦斯抽采理论与技术[J].煤炭学报,2013,38(1):1-8.Yuan Liang,Guo Hua,Li Ping,et al.Theory and technology of gas extraction in goaf of large diameter surface drilling[J].Journal of China Coal Society,2013,38(1):1-8.
[14] Xie H P,Gao F,Zhou H W,et al.On theoretical and modeling approach to mining enhanced permeability for simultaneous exploitation of coal and gas[J].Journal of China Coal Society,2013,38(7):1101-1108.
[15] Xie H P,Xie J,Gao M Z,et al.Theoretical and experimental validation of mining-enhanced permeability for simultaneous exploitation of coal and gas[J].Environmental Earth Sciences,2015,73(10):5951-5962.
[16] 张志刚,程波.考虑吸附作用的煤层瓦斯非线性渗流数学模型[J].岩石力学与工程学报,2015,34(5):1006-1012.Zhang Zhigang,Cheng Bo.Mathematical model of coal seam gas non-linear seepage considering adsorption[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(5):1006-1012.
[17] 章梦涛,潘山,梁冰,等.煤岩流体力学[M].北京:科学出版社,1995.
[18] Liu Yingke,Shao Sihua,Wang Xinxin,et al.Gas flow analysis for the impact of gob gas ventholes on coalbed methane extraction from a longwall gob[J].Journal of Natural Gas Science and Engineering,2016:1-14.
[19] 李宗翔,王继仁,周西华.采空区开区移动瓦斯抽放的数值模似[J].中国矿业大学学报,2004,33(1):77-81.Li Zongxiang,Wang Jiren,Zhou Xihua.The numerical simulation of mobile gas extraction in goaf openings[J].Journal of China University of Mining and Technology,2004,33(1):77-81.
[20] Xia Tongqiang,Zhou Fubao,Wang Xinxin,et al.Controlling factors of symbiotic disaster between coal gas and spontaneous combustion in longwall mining gobs[J].Fuel,2016(3):26-31.
[2] 张学亮.分层开采上分层综采工作面采空区瓦斯抽采技术优化[J].煤矿安全,2018,49(5):143-146.Zhang Xueliang.Optimization of gas extraction technology in goaf of fully-mechanized mining face with upper layer in slicing mining[J].Safety in Coal Mines,2018,49(5):143-146.
[3] 崔光俊,李桂臣,孙元田.突出危险煤层首采面采空区瓦斯抽采模拟分析[J].煤矿安全,2016,47(7):151-154,159.Cui Guangjun,Li Guichen,Sun Yuantian.Gas extraction simulation analysis of goaf in the first mining face of outburst dangerous coal seam[J].Safety in Coal Mines,2016,47(7):151-154,159.
[4] 梁冰,袁欣鹏,孙维吉.本煤层顺层瓦斯抽采渗流耦合模型及应用[J].中国矿业大学学报,2014,43(2):208-213.Liang Bing,Yuan Xinpeng,Sun Weiji.Coupled seepage model and its application for seam gas extraction along seam[J].Journal of China University of Mining and Technology,2014,43(2):208-213.
[5] 许江,苏小鹏,彭守建,等.卸压区不同钻孔长度抽采条件下瓦斯运移特性试验[J].岩土力学,2018,39(1):103-111,122.Xu Jiang,Su Xiaopeng,Peng Shoujian,et al.Gas migration characteristics test under different drilling length extraction conditions in pressure relief area[J].Geotechnical Mechanics,2018,39(1):103-111,122.
[6] 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.The mechanism and experiment of enhanced gas extraction and pressure relief in high gas mining face of low permeability coal seam group[J].Journal of China Coal Society,2010,35(4):580-585.
[7] 王旭锋,张东升,李国君,等.铁法矿区高瓦斯低透气性煤层群卸压煤层气抽采钻孔布置[J].煤炭学报,2011,36(8):1296-1301.Wang Xufeng,Zhang Dongsheng,Li Guojun,et al.Borehole layout of pressure relief CBM extraction for high gas and low permeability coal seams in Tiefa mining area[J].Journal of China Coal Society,2011,36(8):1296-1301.
[8] 胡延伟,孙路路,江城浩,等.基于COMSOL的采空区瓦斯抽采数值模拟研究[J].煤矿安全,2018,49(5):167-170,174.Hu Yanwei,Sun Lulu,Jiang Chenghao,et al.Study on numerical simulation of goaf gas extraction based on COMSOL[J].Safety in Coal Mines,2018,49 (5):167-170,174.
[9] 尹光志,李铭辉,李生舟,等.基于含瓦斯煤岩固气耦合模型的钻孔抽采瓦斯三维数值模拟[J].煤炭学报,2013,38(4):535-541.Yin Guangzhi,Li Minghui,Li Shengzhou,et al.Three-dimensional numerical simulation of gas extraction by drilling based on solid-gas coupling model of gas-bearing coal and rock[J].Journal of China Coal Society,2013,38(4):535-541.
[10] 李宏,马金魁.基于COMSOL Multiphysics模拟的瓦斯抽采钻孔合理间距研究[J].能源与环保,2018,40(12):1-5.Li Hong,Ma Jinkui.Research on reasonable spacing of gas drainage boreholes based on COMSOL Multiphysics simulation[J].China Energy and Environmental Protection,2018,40(12):1-5.
[11] 蒋静晓,李治理.基于COMSOL的钻孔有效抽采半径变化规律研究与工程应用[J].能源与环保,2018,40(7):58-63.Jiang Jingxiao,Li Zhili.Research on changing regularity of effective mining radius based on COMSOL and its engineering application[J].China Energy and Environmental Protection,2018,40(7):58-63.
[12] 徐玉胜,李春元,张勇.大采高采场“U”型通风系统采空区大流量瓦斯抽采技术[J].煤矿安全,2018,49(9):100-104.Xu Yusheng,Li Chunyuan,Zhang Yong.Large-flow gas extraction technology of "U" ventilation system in goaf of large mining height stope[J].Safety in Coal Mines,2018,49(9):100-104.
[13] 袁亮,郭华,李平,等.大直径地面钻井采空区采动区瓦斯抽采理论与技术[J].煤炭学报,2013,38(1):1-8.Yuan Liang,Guo Hua,Li Ping,et al.Theory and technology of gas extraction in goaf of large diameter surface drilling[J].Journal of China Coal Society,2013,38(1):1-8.
[14] Xie H P,Gao F,Zhou H W,et al.On theoretical and modeling approach to mining enhanced permeability for simultaneous exploitation of coal and gas[J].Journal of China Coal Society,2013,38(7):1101-1108.
[15] Xie H P,Xie J,Gao M Z,et al.Theoretical and experimental validation of mining-enhanced permeability for simultaneous exploitation of coal and gas[J].Environmental Earth Sciences,2015,73(10):5951-5962.
[16] 张志刚,程波.考虑吸附作用的煤层瓦斯非线性渗流数学模型[J].岩石力学与工程学报,2015,34(5):1006-1012.Zhang Zhigang,Cheng Bo.Mathematical model of coal seam gas non-linear seepage considering adsorption[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(5):1006-1012.
[17] 章梦涛,潘山,梁冰,等.煤岩流体力学[M].北京:科学出版社,1995.
[18] Liu Yingke,Shao Sihua,Wang Xinxin,et al.Gas flow analysis for the impact of gob gas ventholes on coalbed methane extraction from a longwall gob[J].Journal of Natural Gas Science and Engineering,2016:1-14.
[19] 李宗翔,王继仁,周西华.采空区开区移动瓦斯抽放的数值模似[J].中国矿业大学学报,2004,33(1):77-81.Li Zongxiang,Wang Jiren,Zhou Xihua.The numerical simulation of mobile gas extraction in goaf openings[J].Journal of China University of Mining and Technology,2004,33(1):77-81.
[20] Xia Tongqiang,Zhou Fubao,Wang Xinxin,et al.Controlling factors of symbiotic disaster between coal gas and spontaneous combustion in longwall mining gobs[J].Fuel,2016(3):26-31.
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