煤岩吸附—解吸变形各向异性特征试验分析
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摘要
在井下瓦斯抽采和地面煤层气开发过程中,气体吸附和解吸会导致煤基质的膨胀和收缩变形。采用自主研发的煤岩气体吸附—解吸变形试验系统,对鹤壁六矿二_1煤层贫瘦煤煤样在不同气体压力下的吸附—解吸变形全过程进行了测试。试验结果表明:①煤样在吸附膨胀和解吸收缩变形过程中均呈现各向异性特征,垂直层理方向变形量最大,平行层理垂直面割理方向次之,平行层理垂直端割理方向最小;②煤岩吸附膨胀和解吸收缩变形量随气体压力的增加而增大,但平行层理垂直面割理方向与垂直端割理方向的变形值之比逐渐减小,各向异性程度逐渐减弱;③煤岩吸附膨胀变形是一个不可逆过程,煤岩吸附—解吸残余变形量与气体压力呈正线性相关性。
In the process of underground gas extraction and development of coalbed methane,the gas adsorption and desorption will cause coal matrix swelling and shrinkage.In order to better analyze the anisotropic characteristics of coal deformation caused by gas adsorption and desorption,we test meager lean coal samples from two-1 coal seam of Hebi No.6 Coal Mine under different gas pressure with a self-developed coal deformation test system.The following phenomena are observed:A.Coal samples show anisotropic characteristics in the process of coal matrix swelling and shrinkage due to gas adsorption and desorption,the deformation in the vertical bedding direction is the largest,the direction in parallel bedding vertical face cleat is the second,and the direction in parallel bedding vertical butt cleat is the smallest;B.The deformation of coal matrix swelling and shrinkage increases with the increase of gas pressure,but the deformation ratio between parallel bedding vertical face cleat direction and vertical butt cleat direction decreases gradually,and their anisotropy diminish gradually;C.The deformation of coal matrix after swelling and shrinkage is an irreversible process,and the residual deformation of coal increases with the increase of gas pressure,and it has a linear correlation with the gas pressure.
In the process of underground gas extraction and development of coalbed methane,the gas adsorption and desorption will cause coal matrix swelling and shrinkage.In order to better analyze the anisotropic characteristics of coal deformation caused by gas adsorption and desorption,we test meager lean coal samples from two-1 coal seam of Hebi No.6 Coal Mine under different gas pressure with a self-developed coal deformation test system.The following phenomena are observed:A.Coal samples show anisotropic characteristics in the process of coal matrix swelling and shrinkage due to gas adsorption and desorption,the deformation in the vertical bedding direction is the largest,the direction in parallel bedding vertical face cleat is the second,and the direction in parallel bedding vertical butt cleat is the smallest;B.The deformation of coal matrix swelling and shrinkage increases with the increase of gas pressure,but the deformation ratio between parallel bedding vertical face cleat direction and vertical butt cleat direction decreases gradually,and their anisotropy diminish gradually;C.The deformation of coal matrix after swelling and shrinkage is an irreversible process,and the residual deformation of coal increases with the increase of gas pressure,and it has a linear correlation with the gas pressure.
引文
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[15] 周军平,鲜学福,姜永东,等.基于热力学方法的煤岩吸附变形模型[J].煤炭学报,2011,36(3):468-472.ZHOU Junping,XIAN Xuefu,JIANG Yongdong,et al.A model of adsorption induced coal deformation based on thermodynamics approach[J].Journal of China Coal Society,2011,36(3):468-472.
[16] 吴世跃,赵文,郭勇义.煤岩体吸附膨胀变形与吸附热力学的参数关系[J].东北大学学报(自然科学版),2005,26(7):683-686.WU Shiyue,ZHAO Wen,GUO Yongyi.Parametric correlation between expansion deformation of coal mass and adsorption thermodynamics[J].Journal of Northeastern University (Natural Science),2005,26(7):683-686.
[17] 刘向峰,刘建军,吕祥锋,等.煤体基质吸附(解吸)变形规律试验研究[J].广西大学学报:自然科学版,2012,37(1):173-177.LIU Xiangfeng,LIU Jianjun,Lü Xiangfeng,et al.An experimental research on the law of adsorption(desorption) deformation of coal matrix[J].Journal of Guangxi University:Natural Sciences Edition,2012,37(1):173-177.
[18] 李祥春,郭勇义,吴世跃.煤吸附膨胀变形与孔隙率、渗透率关系的分析[J].太原理工大学学报,2005,36(5):264-266.LI Xiangchun,GUO Yongyi,WU Shiyue.Analysis of the relation of porosity,permeability and swelling deformation of coal[J].Journal of Taiyuan University of Technology,2005,36(5):264-266.
[19] 李祥春,郭勇义,吴世跃,等.考虑吸附膨胀应力影响的煤层瓦斯流—固耦合渗流数学模型及数值模拟[J].岩石力学与工程学报,2007,26(增刊1):2743-2748.LI Xiangchun,GUO Yongyi,WU Shiyue,et al.Mathe-matical model and numerical simulation of fluid-solid coupled flow of coal-bed gas considering swelling stress of adsorption[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(S1):2743-2748.
[20] 谢剑勇,魏建新,狄帮让,等.页岩各向异性参数间关系及其影响因素分析[J].石油地球物理勘探,2015,50(6):1141-1145.XIE Jianyong,WEI Jianxin,DI Bangrang,et al.Correlation of shale anisotropic parameters and the influencing factors[J].Oil Geophysical Prospecting,2015,50(6):1141-1145.
[21] 席道瑛,张程远,刘小燕.储层砂岩的各向异性[J].石油地球物理勘探,2001,36(2):187-192.XI Daoying,ZHANG Chengyuan,LIU Xiaoyan.Anisotropy in reservoir sand-stone[J].Oil Geophysical Prospecting,2001,36(2):187-192.
[22] 裴正林,董玉珊,彭苏萍.裂隙煤层弹性波场方位各向异性特征数值模拟研究[J].石油地球物理勘探,2007,42(6):665-672.PEI Zhenglin,DONG Yushan,PENG Suping.Nume-ric simulation of azimuth anisotropic characters of elastic wavefield in fractural coal seams[J].Oil Geophysical Prospecting,2007,42(6):665-672.
[23] Levine J R.Model study of the influence of matrix shrinkage on absolute permeability of coal bed reservoirs//Gayer R,Harris I (Eds).Coalbed Methane and Coal Geology[M].Geological Society Special Publication,London,1996,197-212.
[24] 赵宇,张玉贵,于弘奕.煤岩吸水率对声波速度各向异性影响的实验研究[J].石油地球物理勘探,2017,52(5):999-1004.ZHAO Yu,ZHANG Yugui,YU Hongyi.Experi- mental research on effects of water absorption on acoustic velocity anisotropy in coal rock[J].Oil Geophysical Prospecting,2017,52(5):999-1004.
[25] 林柏泉,周世宁.含瓦斯煤体变形规律的实验研究[J].中国矿业学院学报,1986,(3):9-16.LIN Baiquan,ZHOU Shining.Experimental investigation on the deformation law of coal body containing methane[J].Journal of China University of Mining,1986,(3):9-16.
[2] 刘延保,曹树刚,李勇,等.煤体吸附瓦斯膨胀变形效应的试验研究[J].岩石力学与工程学报,2010,29(12):2484-2491.LIU Yanbao,CAO Shugang,LI Yong,et al.Experimental study of swelling deformation effect of coal induced by gas adsorption[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(12):2484-2491.
[3] 刘延保.基于细观力学试验的含瓦斯煤体变形破坏规律研究[D].重庆大学,重庆,2009.LIU Yanbao.Study on the Deformation and Damage Rules of Gas-filled Coal Base on Micromechanical Experiments[D].Chongqing University,Chongqing,2009.
[4] Karacan C O.Heterogeneous sorption and swelling in a confined and stressed coal during CO2 injection[J].Energy and Fuels,2003,17(6):1595-1608.
[5] Karacan C O.Swelling-induced volumetric strains internal to a stressed coal associated with CO2 sorption[J].International Journal of Coal Geology,2007,72(3-4):209-220.
[6] Pan Zhejun,Connell L D.A theoretical model for gas adsorption: induced coal swelling[J].International Journal of Coal Geology,2007,69(4):243-252.
[7] 潘哲军,卢克·康奈尔.煤的膨胀和收缩在二氧化碳增产煤层甲烷过程中的影响[J].中国煤层气,2007,4(1):7-10.PAN Zhejun,Connell L D.Effects of coal matrix shrinkage/swelling on enhanced CBM recovery through CO2 sequestration[J].China Coalbed Me-thane,2007,4(1):7-10.
[8] 梁冰,于洪雯,孙维吉,等.煤低压吸附瓦斯变形试验[J].煤炭学报,2013,38(3):373-377.LIANG Bing,YU Hongwen,SUN Weiji,et al.An experimental on deformation of coal adsorption of law Pressure gas[J].Journal of China Coal Society,2013,38(3):373-377.
[9] 姚宇平.吸附瓦斯对煤的变形及强度的影响[J].煤矿安全,1988,(12):37-41.YAO Yuping.Effect of adsorbed gas on deformation and strength of coal[J].Safety in Coal Mines,1988,(12):37-41.
[10] 王佑安,陶玉梅,王魁军,等.煤的吸附变形与吸附变形力[J].煤矿安全,1993,(6):19-26.WANG Youan,TAO Yumei,WANG Kuijun,et al.Adsorption deformation on force of adsorption deformation of coal[J].Safety in Coal Mines,1993,(6):19-26.
[11] 何学秋,王恩元,林海燕.孔隙气体对煤体变形及蚀损作用机理[J].中国矿业大学学报,1996,25(1):6-11.HE Xueqiu,WANG Enyuan,LIN Haiyan.Coal deformation and fracture mechanism under pore gas action[J].Journal of China University of Mining & Technology,1996,25(1):6-11.
[12] 曹树刚,张遵国,李毅,等.突出危险煤吸附、解吸瓦斯变形特性试验研究[J].煤炭学报,2013,38(10):1792-1799.CAO Shugang,ZHANG Zunguo,LI Yi,et al.Experimental study of deformation properties of outburst-prone coal induced by gas adsorption and desorption[J].Journal of China Coal Society,2013,38(10):1792-1799.
[13] 郭平,曹树刚,张遵国,等.煤体吸附膨胀变形模型理论研究[J].岩土力学,2014,35(12):3467-3472.GUO Ping,CAO Shugang,ZHANG Zunguo,et al.Theoretical study of deformation model of coal swelling induced by gas adsorption[J].Rock and Soil Mechanics,2014,35(12):3467-3472.
[14] 张遵国,曹树刚,郭平,等.原煤和型煤吸附-解吸瓦斯变形特性对比研究[J].中国矿业大学学报,2014,43(3):388-394.ZHANG Zunguo,CAO Shugang,GUO Ping,et al.Comparison of the deformation characteristics of coal in gas adsorption-desorption process for raw and briquette coal[J].Journal of China University of Mining & Technology,2014,43(3):388-394.
[15] 周军平,鲜学福,姜永东,等.基于热力学方法的煤岩吸附变形模型[J].煤炭学报,2011,36(3):468-472.ZHOU Junping,XIAN Xuefu,JIANG Yongdong,et al.A model of adsorption induced coal deformation based on thermodynamics approach[J].Journal of China Coal Society,2011,36(3):468-472.
[16] 吴世跃,赵文,郭勇义.煤岩体吸附膨胀变形与吸附热力学的参数关系[J].东北大学学报(自然科学版),2005,26(7):683-686.WU Shiyue,ZHAO Wen,GUO Yongyi.Parametric correlation between expansion deformation of coal mass and adsorption thermodynamics[J].Journal of Northeastern University (Natural Science),2005,26(7):683-686.
[17] 刘向峰,刘建军,吕祥锋,等.煤体基质吸附(解吸)变形规律试验研究[J].广西大学学报:自然科学版,2012,37(1):173-177.LIU Xiangfeng,LIU Jianjun,Lü Xiangfeng,et al.An experimental research on the law of adsorption(desorption) deformation of coal matrix[J].Journal of Guangxi University:Natural Sciences Edition,2012,37(1):173-177.
[18] 李祥春,郭勇义,吴世跃.煤吸附膨胀变形与孔隙率、渗透率关系的分析[J].太原理工大学学报,2005,36(5):264-266.LI Xiangchun,GUO Yongyi,WU Shiyue.Analysis of the relation of porosity,permeability and swelling deformation of coal[J].Journal of Taiyuan University of Technology,2005,36(5):264-266.
[19] 李祥春,郭勇义,吴世跃,等.考虑吸附膨胀应力影响的煤层瓦斯流—固耦合渗流数学模型及数值模拟[J].岩石力学与工程学报,2007,26(增刊1):2743-2748.LI Xiangchun,GUO Yongyi,WU Shiyue,et al.Mathe-matical model and numerical simulation of fluid-solid coupled flow of coal-bed gas considering swelling stress of adsorption[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(S1):2743-2748.
[20] 谢剑勇,魏建新,狄帮让,等.页岩各向异性参数间关系及其影响因素分析[J].石油地球物理勘探,2015,50(6):1141-1145.XIE Jianyong,WEI Jianxin,DI Bangrang,et al.Correlation of shale anisotropic parameters and the influencing factors[J].Oil Geophysical Prospecting,2015,50(6):1141-1145.
[21] 席道瑛,张程远,刘小燕.储层砂岩的各向异性[J].石油地球物理勘探,2001,36(2):187-192.XI Daoying,ZHANG Chengyuan,LIU Xiaoyan.Anisotropy in reservoir sand-stone[J].Oil Geophysical Prospecting,2001,36(2):187-192.
[22] 裴正林,董玉珊,彭苏萍.裂隙煤层弹性波场方位各向异性特征数值模拟研究[J].石油地球物理勘探,2007,42(6):665-672.PEI Zhenglin,DONG Yushan,PENG Suping.Nume-ric simulation of azimuth anisotropic characters of elastic wavefield in fractural coal seams[J].Oil Geophysical Prospecting,2007,42(6):665-672.
[23] Levine J R.Model study of the influence of matrix shrinkage on absolute permeability of coal bed reservoirs//Gayer R,Harris I (Eds).Coalbed Methane and Coal Geology[M].Geological Society Special Publication,London,1996,197-212.
[24] 赵宇,张玉贵,于弘奕.煤岩吸水率对声波速度各向异性影响的实验研究[J].石油地球物理勘探,2017,52(5):999-1004.ZHAO Yu,ZHANG Yugui,YU Hongyi.Experi- mental research on effects of water absorption on acoustic velocity anisotropy in coal rock[J].Oil Geophysical Prospecting,2017,52(5):999-1004.
[25] 林柏泉,周世宁.含瓦斯煤体变形规律的实验研究[J].中国矿业学院学报,1986,(3):9-16.LIN Baiquan,ZHOU Shining.Experimental investigation on the deformation law of coal body containing methane[J].Journal of China University of Mining,1986,(3):9-16.