钻孔数量对瓦斯抽采量及抽采时间的影响
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摘要
基于自主研发的多场耦合煤层气开采物理模拟试验系统升级改造了顺层钻孔瓦斯抽采系统,开展了不同钻孔数量条件下顺层钻孔瓦斯抽采物理模拟试验,探讨了瓦斯抽采量(瞬时流量、累积流量)和抽采时间的演化规律.结果表明:当钻孔数量由1个增加到2,3和4个时,单钻孔累积流量约下降至原来的0.60,0.45和0.35倍.不同钻孔数量抽采时,瞬时流量曲线出现交叉现象,即抽采前期钻孔数量越多瞬时流量越大,中后期逐渐变化为钻孔数量越多瞬时流量越小.累积流量随钻孔数量的增加呈对数函数增加,钻孔数量越多,其增加效果越不明显.抽采时间随钻孔数量的增加呈幂函数降低,钻孔数量越多,其下降效果越不明显.
The gas drainage system with bedding boreholes was upgraded based on the self-developed multi-field coupling test system,and the physical simulations of bedding borehole drainage with different borehole amounts were conducted.The gas flow rate and cumulative flow rate were analyzed.The results show that the cumulative flow rate of the same branch borehole falls 0.60 times,0.45 times and 0.35 times when the borehole amounts increase from 1 to 2,3 and 4.The crossover of flow rate curves with different borehole amounts occurs during gas drainage,namely the greater the borehole amounts,the bigger the flow rate in the early stage of gas drainage.While in the later stage,the greater the borehole amounts,the smaller the flow rate.The cumulative flow rate increases with borehole amounts which obeys logarithmic law,and the effect drops with the increasing of borehole amounts.The drainage time decreases with borehole amount which obeys power function,and the declining effect decreases with the increasing of borehole amount.
The gas drainage system with bedding boreholes was upgraded based on the self-developed multi-field coupling test system,and the physical simulations of bedding borehole drainage with different borehole amounts were conducted.The gas flow rate and cumulative flow rate were analyzed.The results show that the cumulative flow rate of the same branch borehole falls 0.60 times,0.45 times and 0.35 times when the borehole amounts increase from 1 to 2,3 and 4.The crossover of flow rate curves with different borehole amounts occurs during gas drainage,namely the greater the borehole amounts,the bigger the flow rate in the early stage of gas drainage.While in the later stage,the greater the borehole amounts,the smaller the flow rate.The cumulative flow rate increases with borehole amounts which obeys logarithmic law,and the effect drops with the increasing of borehole amounts.The drainage time decreases with borehole amount which obeys power function,and the declining effect decreases with the increasing of borehole amount.
引文
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[14]王兆丰,田福超,赵彬,等.羽状千米长钻孔抽采效果考察试验[J].煤炭学报,2010,35(1):76-79.WANG Zhaofeng,TIAN Fuchao,ZHAO Bin,et al.The testing of gas drainage efficiency about featherveined 1 000mlength-drill hole[J].Journal of China Coal Society,2010,35(1):76-79.
[15]冯增朝,赵阳升,杨栋,等.瓦斯排放与煤体变形规律试验研究[J].辽宁工程技术大学学报,2006,25(1):21-23.FENG Zengchao,ZHAO Yangsheng,YANG Dong,et al.Experimental study on rules of gas drainage and coal mass deformation[J].Journal of Liaoning Technical University,2006,25(1):21-23.
[16]范家文,冯增朝.瓦斯排放过程中煤体有效应力规律的实验研究[J].太原理工大学学报,2008,39(4):397-399.FAN Jiawen,FENG Zengchao.Research on the law of effective stress of coal-mass during methane drainage[J].Journal of Taiyuan University of Technology,2008,39(4):397-399.
[17]刘东,许江,尹光志,等.多场耦合煤层气开采物理模拟试验系统的研制和应用[J].岩石力学与工程学报,2014,33(增2):3505-3514.LIU Dong,XU Jiang,YIN Guangzhi,et al.Development and application of multi-field coupling testing system for coal-bed methane(CBM)exploitation[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(Sup 2):3505-3514.
[18]彭守建,张超林,梁永庆,等.抽采瓦斯过程中煤层瓦斯压力演化规律的物理模拟试验研究[J].煤炭学报,2015,40(3):571-578.PENG Shoujian,ZHANG Chaolin,LIANGYongqing,et al.Physical simulation experiment on the evolution of gas pressure during CBM drainage[J].Journal of China Coal Society,2015,40(3):571-578.
[19]彭守建,张超林,许江,等.抽采瓦斯过程中煤层温度演化规律的物理模拟试验研究[J].岩石力学与工程学报,2015,34(7):1325-1333.PENG Shoujian,ZHANG Chaolin,XU Jiang,et al.Physical simulation experiment on temperature variation during coal-bed methane drainage[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(7):1325-1333.
[20]许江,张超林,彭守建,等.多层叠置煤层气系统合采方式及其优化[J].煤炭学报,2018,43(6):1677-1686.XU Jiang,ZHANG Chaolin,PENG Shoujian,et al.Multiple layers superposed CBM system commingled drainage schedule and its optimization[J].Journal of China Coal Society,2018,43(6):1677-1686.
[2]袁亮,秦勇,程远平,等.我国煤层气矿井中-长期抽采规模情景预测[J].煤炭学报,2013,38(4):529-534.YUAN Liang,QIN Yong,CHENG Yuanping,et al.Scenario predication for medium-long term scale of coal mine methane drainage in China[J].Journal of China Coal Society,2013,38(4):529-534.
[3]周福宝,孙玉宁,李海鉴,等.煤层瓦斯抽采钻孔密封理论模型与工程技术研究[J].中国矿业大学学报,2016,45(3):433-439.ZHOU Fubao,SUN Yuning,LI Haijian,et al.Research on the theoretical model and engineering technology of the coal seam gas drainage sealing[J].Journal of China University of Mining&Technology,2016,45(3):433-439.
[4]曹偈,孙海涛,戴林超,等.煤与瓦斯突出动力效应的模拟研究[J].中国矿业大学学报,2018,47(1):113-120.CAO Jie,SUN Haitao,DAI Linchao,et al.Simulation research on dynamic effect of coal and gas outburst[J].Journal of China University of Mining&Technology,2018,47(1):113-120.
[5]XUE Y,GAO F,GAO Y,et al.Thermo-hydro-mechanical coupled mathematical model for controlling the pre-mining coal seam gas extraction with slotted boreholes[J].International Journal of Mining Science and Technology,2017,27(3):473-480.
[6]林柏泉,刘厅,杨威.基于动态扩散的煤层多场耦合模型建立及应用[J].中国矿业大学学报,2018,47(1):32-39.LIN Baiquan,LIU Ting,YANG Wei.Solid-gas coupling model for coalseams based on dynamic diffusion and its application[J].Journal of China University of Mining&Technology,2018,47(1):32-39.
[7]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.3Dnumerical simulation of gas drainage from boreholes based on solid-gas coupling model of coal containing gas[J].Journal of China Coal Society,2013,38(4):535-541.
[8]刘清泉,程远平,李伟,等.深部低透气性首采层煤与瓦斯气固耦合模型[J].岩石力学与工程学报,2015,34(增1):2749-2758.LIU Qingquan,CHENG Yuanping,LI Wei,et al.Mathematical model of coupled gas flow and coal deformation process in low-permeability and first mine coal seam[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(Sup 1):2749-2758.
[9]王登科,彭明,付启超,等.瓦斯抽采过程中的煤层透气性动态演化规律与数值模拟[J].岩石力学与工程学报,2015,35(4):1-9.WANG Dengke,PENG Ming,FU Qichao,et al.Evolution and numerical simulation of coal permeability during gas drainage in coal seams[J].Chinese Journal of Rock Mechanics and Engineering,2015,35(4):1-9.
[10]卢义玉,贾亚杰,葛兆龙,等.割缝后煤层瓦斯的流-固耦合模型及应用[J].中国矿业大学学报,2014,43(1):23-29.LU Yiyu,JIA Yajie,GE Zhaolong,et al.Coupled fluid-solid model of coal bed methane and its application after slotting by high-pressure water jet[J].Journal of China University of Mining&Technology,2014,43(1):23-29.
[11]梁冰,袁新鹏,孙维吉,等.分组测压确定瓦斯有效抽采半径试验研究[J].采矿与安全工程学报,2013,30(1):132-135.LIANG Bing,YUAN Xinpeng,SUN Weiji,et al.Grouped pressure test to determine effective gas drainage radius[J].Journal of Mining&Safety Engineering,2013,30(1):132-135.
[12]鲁义,申宏敏,秦波涛,等.顺层钻孔瓦斯抽采半径及布孔间距研究[J].采矿与安全工程学报,2015,32(1):156-162.LU Yi,SHEN Hongmin,QIN Botao,et al.Gas drainage radius and borehole distance along seam[J].Journal of Mining&Safety Engineering,2015,32(1):156-162.
[13]褚廷湘,余明高,姜德义,等.“U+I”型采煤工作面采空区瓦斯抽采量理论研究[J].中国矿业大学学报,2015,44(6):1008-1016.CHU Tingxiang,YU Minggao,JIANG Deyi,et al.Theory of gas extraction amount in the gob of“U+I”type panel[J].Journal of China University of Mining&Technology,2015,44(6):1008-1016.
[14]王兆丰,田福超,赵彬,等.羽状千米长钻孔抽采效果考察试验[J].煤炭学报,2010,35(1):76-79.WANG Zhaofeng,TIAN Fuchao,ZHAO Bin,et al.The testing of gas drainage efficiency about featherveined 1 000mlength-drill hole[J].Journal of China Coal Society,2010,35(1):76-79.
[15]冯增朝,赵阳升,杨栋,等.瓦斯排放与煤体变形规律试验研究[J].辽宁工程技术大学学报,2006,25(1):21-23.FENG Zengchao,ZHAO Yangsheng,YANG Dong,et al.Experimental study on rules of gas drainage and coal mass deformation[J].Journal of Liaoning Technical University,2006,25(1):21-23.
[16]范家文,冯增朝.瓦斯排放过程中煤体有效应力规律的实验研究[J].太原理工大学学报,2008,39(4):397-399.FAN Jiawen,FENG Zengchao.Research on the law of effective stress of coal-mass during methane drainage[J].Journal of Taiyuan University of Technology,2008,39(4):397-399.
[17]刘东,许江,尹光志,等.多场耦合煤层气开采物理模拟试验系统的研制和应用[J].岩石力学与工程学报,2014,33(增2):3505-3514.LIU Dong,XU Jiang,YIN Guangzhi,et al.Development and application of multi-field coupling testing system for coal-bed methane(CBM)exploitation[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(Sup 2):3505-3514.
[18]彭守建,张超林,梁永庆,等.抽采瓦斯过程中煤层瓦斯压力演化规律的物理模拟试验研究[J].煤炭学报,2015,40(3):571-578.PENG Shoujian,ZHANG Chaolin,LIANGYongqing,et al.Physical simulation experiment on the evolution of gas pressure during CBM drainage[J].Journal of China Coal Society,2015,40(3):571-578.
[19]彭守建,张超林,许江,等.抽采瓦斯过程中煤层温度演化规律的物理模拟试验研究[J].岩石力学与工程学报,2015,34(7):1325-1333.PENG Shoujian,ZHANG Chaolin,XU Jiang,et al.Physical simulation experiment on temperature variation during coal-bed methane drainage[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(7):1325-1333.
[20]许江,张超林,彭守建,等.多层叠置煤层气系统合采方式及其优化[J].煤炭学报,2018,43(6):1677-1686.XU Jiang,ZHANG Chaolin,PENG Shoujian,et al.Multiple layers superposed CBM system commingled drainage schedule and its optimization[J].Journal of China Coal Society,2018,43(6):1677-1686.