温度-压力耦合下原煤中CO_2渗流行为试验研究
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摘要
利用煤岩力学-渗流试验系统TAWD-2000,对平顶山矿、长治矿和金佳矿的三类原煤试样开展了温度、气压和围压耦合下的CO_2渗流行为试验研究,系统分析了三类原煤试样的渗透率随温度、气压和围压的演化规律及影响因素.结果表明:原煤渗透率随气压的增大呈指数增大趋势,低围压下,指数增长趋势明显,高围压下,增长趋于线性;原煤渗透率随围压的增大呈指数减小趋势,当围压较低时,煤样渗透率对围压变化非常敏感,渗透率随着围压的增大迅速减小,随后趋于稳定;原煤的渗透率随温度的升高大多呈减小趋势,但也可能出现先减小后增大的趋势,这是原煤热膨胀、CO_2解吸和裂隙残余水分蒸发耦合作用的结果.
Experimental studies of the seepage behavior of CO_2 in raw coal samples from Pingdingshan, Changzhi and Jinjia mine under variable temperature, confining pressure and gas pressure were performed on rock mechanics testing system TAWD-2000. Evolutions of coal permeability with coal temperature, gas pressure and confining pressure were explored. The results show that:the permeability of raw coal increases exponentially with increasing gas pressure. When confining pressure is lower, the exponential function pattern of coal permeability evolution is obvious, whereas the evolution pattern trends to be linear-like when confining pressure is higher. The permeability of raw coal decreases exponentially with increasing confining pressure. Coal permeability is more sensitive to changes of confining pressure when it is lower. Moreover, coal permeability decreases promptly firstly with the increasing of confining pressure, and then tends to be stable. The permeability of most raw coal samples decreases with the increasing of temperature, whereas it decreases firstly and then increases sometimes. It is a competitive result of thermal expansion, CO_2 desorption and the evaporation of residual water from fracture channels.
Experimental studies of the seepage behavior of CO_2 in raw coal samples from Pingdingshan, Changzhi and Jinjia mine under variable temperature, confining pressure and gas pressure were performed on rock mechanics testing system TAWD-2000. Evolutions of coal permeability with coal temperature, gas pressure and confining pressure were explored. The results show that:the permeability of raw coal increases exponentially with increasing gas pressure. When confining pressure is lower, the exponential function pattern of coal permeability evolution is obvious, whereas the evolution pattern trends to be linear-like when confining pressure is higher. The permeability of raw coal decreases exponentially with increasing confining pressure. Coal permeability is more sensitive to changes of confining pressure when it is lower. Moreover, coal permeability decreases promptly firstly with the increasing of confining pressure, and then tends to be stable. The permeability of most raw coal samples decreases with the increasing of temperature, whereas it decreases firstly and then increases sometimes. It is a competitive result of thermal expansion, CO_2 desorption and the evaporation of residual water from fracture channels.
引文
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[19] 高莎莎,王延斌,贾立龙,等.温度及压力对CO2置换CH4的影响[J].中国矿业大学学报,2013,42(5):801-805.GAO Shasha,WANG Yanbin,JIA Lilong,et al.Influence of temperature and pressure on the replacement of CH4 with CO2[J].Journal of China University of Mining and Technology,2013,42(5):801-805.
[20] 康志勤,李翔,李伟,等.煤体结构与甲烷吸附/解吸规律相关性实验研究及启示[J].煤炭学报,2018,43(5):1400-1407.KANG Zhiqin,LI Xiang,LI Wei,et al.Experimental investigation of methane adsorption/desorption behavior in coals with different coal-body structure and its revelation[J].Journal of China Coal Society,2018,43(5):1400-1407.
[21] 侯鹏,高峰,高亚楠,等.脉冲气压疲劳对原煤力学特性及渗透率的影响[J].中国矿业大学学报,2017,46(2):257-264.HOU Peng,GAO Feng,GAO Yanan,et al.Effect of pulse gas pressure fatigue on mechanical properties and permeability of raw coal[J].Journal of China University of Mining & Technology,2017,46(2):257-264.
[2] XUE Yi,GAO Feng,GAO Yanan,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.
[3] 裴晓东,张人伟,马伟南.高瓦斯易自燃采空区瓦斯与煤自燃耦合模拟研究[J].煤炭科学技术,2016,44(4):73-77.PEI Xiaodong,ZHANG Renwei,MA Weinan.Study on coupling simulation of gas and coal spontaneous combustion in high gassy and easy spontaneous combustion goaf[J].Coal Science and Technology,2016,44(4):73-77.
[4] XIA T,ZHOU F,LIU J,et al.A fully coupled hydro-thermo-mechanical model for the spontaneous combustion of underground coal seams[J].Fuel,2014,125(1):106-115.
[5] 于永江,张华,张春会,等.温度及应力对成型煤样渗透性的影响[J].煤炭学报,2013,38(6):936-941.YU Yongjiang,ZHANG Hua,ZHANG Chunhui,et al.Effects of temperature and stress on permeability of standard coal briquette specimen[J].Journal of China Coal Society,2013,38(6):936-941.
[6] 胡雄,梁为,侯厶靖,等.温度与应力对原煤,型煤渗透特性影响的试验研究[J].岩石力学与工程学报,2012,31(6):1222-1229.HU Xiong,LIANG Wei,HOU Sijing,et al.Experimental study of effect of temperature and stress on permeability characteristics of raw coal and shaped coal[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(6):1222-1229.
[7] 陈术源,秦勇,申建,等.高阶煤渗透率温度应力敏感性试验研究[J].煤炭学报,2014,39(9):1845-1851.CHEN Shuyuan,QIN Yong,SHEN Jian,et al.Temperature-stress sensitivity of high-rank coal permeability[J].Journal of China Coal Society,2014,39(9):1845-1851.
[8] 尹光志,蒋长宝,许江,等.含瓦斯煤热流固耦合渗流实验研究[J].煤炭学报,2011,36(9):1495-1500.YIN Guangzhi,JIANG Changbao,XU Jiang,et al.Experimental study of thermo-fluid-solid coupling seepage of coal containing gas[J].Journal of China Coal Society,2011,36(9):1495-1500.
[9] YIN G,JIANG C,WANG J G,et al.Combined effect of stress,pore pressure and temperature on methane permeability in anthracite coal:An experimental study[J].Transport in Porous Media,2013,100(1):1-16.
[10] 许江,张丹丹,彭守建,等.三轴应力条件下温度对原煤渗流特性影响的实验研究[J].岩石力学与工程学报,2011,30(9):1848-1854.XU Jiang,ZHANG Dandan,PENG Shoujian,et al.Experimental research on impact of temperature on seepage characteristics of coal containing methane under triaxial stress[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(9):1848-1854.
[11] 徐佳俊,陈宇龙,蒋成荣,等.CO2在煤层中的渗流特性试验[J].矿业安全与环保,2017,44(4):10-13.XU Jiajun,CHEN Yulong,JIANG Chengrong,et al.Test on carbon dioxide permeability in coal seam[J].Mining Safety and Enviromental Protedction,2017,44(4):10-13.
[12] 周军平,鲜学福,李晓红,等.吸附不同气体对煤岩渗透特性的影响[J].岩石力学与工程学报,2010,29(11):2256-2262.ZHOU Junping,XIAN Xuefu,LI Xiaohong,et al.Effect of different adsorptional gases on permeability of coal[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(11):2256-2262.
[13] PERERA M S A,RANJITH P G,CHOI S K.Coal cleat permeability for gas movement under triaxial,non-zero lateral strain condition:A theoretical and experimental study[J].Fuel,2013,109:389-399.
[14] ANGGARA F,SASAKI K,SUGAI Y.The correlation between coal swelling and permeability during CO2 sequestration:A case study using Kushiro low rank coals[J].International Journal of Coal Geology,2016,166(1):62-70.
[15] 孙可明,吴迪,粟爱国,等.超临界CO2作用下煤体渗透性与孔隙压力-有效体积应力-温度耦合规律试验研究[J].岩石力学与工程学报,2013,32 (增2):3760-3767.SUN Keming,WU Di,SU Aiguo,et al.Coupling experimental study of coal permeability with pore pressure-effective volume stress-temperature under supercritical carbon dioxide action[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(Sup 2):3760-3767.
[16] 岳立新,孙可明,郝志勇.超临界CO2提高煤层渗透性的增透规律研究[J].中国矿业大学学报,2014,43(2):319-324.YUE Lixin,SUN Keming,HAO Zhiyong.Study on increased permeability law of coal seam by supercritical CO2[J].Journal of China University of Mining & Technology,2014,43(2):319-324.
[17] 梁卫国,张倍宁,韩俊杰,等.超临界CO2驱替煤层 CH4装置及试验研究[J].煤炭学报,2014,39(8):1511-1520.LIANG Weiguo,ZHANG Beining,HAN Junjie,et al.Experimental study on coal bed methane displacement and recovery by super critical carbon dioxide injection[J].Journal of China Coal Society,2014,39(8):1511-1520.
[18] 梁卫国,吴迪,赵阳升.CO2驱替煤层CH4试验研究[J].岩石力学与工程学报,2010,29(4):665-673.LIANG Weiguo,WU Di,ZHAO Yangsheng.Experimental study of coalbeds methane replacement by carbon dioxids[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(4):665-673.
[19] 高莎莎,王延斌,贾立龙,等.温度及压力对CO2置换CH4的影响[J].中国矿业大学学报,2013,42(5):801-805.GAO Shasha,WANG Yanbin,JIA Lilong,et al.Influence of temperature and pressure on the replacement of CH4 with CO2[J].Journal of China University of Mining and Technology,2013,42(5):801-805.
[20] 康志勤,李翔,李伟,等.煤体结构与甲烷吸附/解吸规律相关性实验研究及启示[J].煤炭学报,2018,43(5):1400-1407.KANG Zhiqin,LI Xiang,LI Wei,et al.Experimental investigation of methane adsorption/desorption behavior in coals with different coal-body structure and its revelation[J].Journal of China Coal Society,2018,43(5):1400-1407.
[21] 侯鹏,高峰,高亚楠,等.脉冲气压疲劳对原煤力学特性及渗透率的影响[J].中国矿业大学学报,2017,46(2):257-264.HOU Peng,GAO Feng,GAO Yanan,et al.Effect of pulse gas pressure fatigue on mechanical properties and permeability of raw coal[J].Journal of China University of Mining & Technology,2017,46(2):257-264.