尺寸效应影响的页岩吸附CH_4试验研究
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摘要
目前开展页岩中CH_4吸附量的试验研究多采用毫米级以下的粉状页岩,而采用块状页岩及考虑尺寸效应影响的页岩吸附CH_4研究较少。为此,利用自主研发的气体吸附解吸试验系统,开展考虑尺寸效应、吸附压力和温度对页岩中CH_4吸附量影响规律研究。试验结果表明:页岩对CH_4的吸附量随压力的升高而增大,随温度的升高CH_4吸附量逐渐减小;随着页岩试件块度的减小,在每个测量点页岩对CH_4的吸附量平均增长6～7倍以上。粉状页岩CH_4的吸附量大于块状页岩CH_4的吸附量。结论认为,页岩对CH_4的吸附平衡时间受尺寸效应影响,试件的块度越大,其达到吸附平衡的时间越长;粉状页岩试件具有更多的高能吸附位暴露在其表面,致使吸附速率增加;尺寸效应对页岩吸附CH_4的影响远大于温度的影响;较低吸附压力条件下,尺寸效应不会影响页岩吸附CH_4曲线类型。
The experimental study on the amount of CH_4 adsorption in shale is mostly performed using powdered shale below the millimeter level,while the adsorption of CH_4 in block shale and size effect are less studied. To this end,the self-developed gas adsorption-desorption test system was used to study the influence of specimen size,pressures and temperatures on the adsorption amount of CH_4 in shale. The experimental results show that the adsorption amount of shale to CH_4 increases with the increase of pressure,while the adsorption amount decreases with the increase of temperatures. With the decrease of the shale test piece,at each measurement point the adsorption capacity of rock on CH_4 increased averagely by 6-7 times. The adsorption of CH_4 in powdered shale is larger than that in bulk shale. It is concluded that the adsorption equilibrium time of shale to CH_4 is affected by the size effect. The larger the blockiness of the specimen is,the longer it reaches the equilibrium of adsorption; the powdered shalehas more high-energy adsorption sites exposed on its surface, and therforethe adsorption rate increases; the size effect on the shale adsorption of CH_4 is much greater than the temperature; at the lower adsorption pressure,the size effect does not affect the type of shale gas isotherms.
The experimental study on the amount of CH_4 adsorption in shale is mostly performed using powdered shale below the millimeter level,while the adsorption of CH_4 in block shale and size effect are less studied. To this end,the self-developed gas adsorption-desorption test system was used to study the influence of specimen size,pressures and temperatures on the adsorption amount of CH_4 in shale. The experimental results show that the adsorption amount of shale to CH_4 increases with the increase of pressure,while the adsorption amount decreases with the increase of temperatures. With the decrease of the shale test piece,at each measurement point the adsorption capacity of rock on CH_4 increased averagely by 6-7 times. The adsorption of CH_4 in powdered shale is larger than that in bulk shale. It is concluded that the adsorption equilibrium time of shale to CH_4 is affected by the size effect. The larger the blockiness of the specimen is,the longer it reaches the equilibrium of adsorption; the powdered shalehas more high-energy adsorption sites exposed on its surface, and therforethe adsorption rate increases; the size effect on the shale adsorption of CH_4 is much greater than the temperature; at the lower adsorption pressure,the size effect does not affect the type of shale gas isotherms.
引文
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[2]Curtis J B.Fractured shale-gas system[J].AAPG Bulletin,2002,86(11):1921-1938.
[3]左罗,熊伟,郭为,等.页岩气赋存力学机制[J].新疆石油地质,2014,35(2):32-36.
[4]邹才能,董大忠,王社教,等.中国页岩气形成机理、地质特征及资源潜力[J].石油勘探与开发,2010,37(6):641-653.
[5]康毅力,陈益滨,李相臣,等.页岩粒径对甲烷吸附性能影响[J].天然气地球科学,2017,28(2):272-279.
[6]张志英,杨盛波.页岩气吸附解吸规律研究[J].实验力学,2012,27(4):492-497.
[7]郭平,张伟,李赟,等.鄂尔多斯盆地陆相页岩吸附规律研究[J].地质科技情报,2017,36(5):55-59.
[8]Zhang T,Ellis G S,Ruppel S C,et al.Effect of organic-matter type and thermal maturity on methane adsorption in shale-gas systems[J].Organic Geochemistry,2012,47:120-131.
[9]侯宇光,何生,易积正,等.页岩孔隙结构对甲烷吸附能力的影响[J].石油勘探与开发,2014,41(2):248-256.
[10]罗小平,吴飘,赵建红,等.富有机质泥页岩有机质孔隙研究进展[J].成都理工大学学报(自然科学版),2015,42(1):50-59.
[11]张庆玲,张遂安.GB/T 19560-2008煤的高压等温吸附试验方法容量法[S].北京:中国标准出版社,2008.
[12]杨峰,宁正福,刘慧卿,等.页岩对甲烷的等温吸附特性研究[J].特种油气藏,2013,20(5):133-136.
[13]Schettler P D,Parmely C R.Contributions to total storage capacity in devonian shales[C].Lexington:SPE Eastern Regional Meeting,1991.
[14]Lu X C,Li F C,Waton A T.Adsorption studies of natural gas storage in devonian shales[J].SPE Formation Evaluation,1995,10(2):109-113.
[15]吉利明,马向贤,夏燕青,等.黏土矿物甲烷吸附性能与微孔隙体积关系[J].天然气地球科学,2014,25(2):141-152.
[16]糜利栋,姜汉桥,李俊键,等.页岩储层气体扩散机理[J].大庆石油地质与开发,2014,33(1):154-159.
[17]Langmuir I.The constitution and fundamental properties of solids and liquids.part I.solids[J].Journal of the American Chemical Society,1917,38(5):102-105.
[18]赵振国.吸附作用应用原理[M].北京:化学工业出版社,2005.
[19]Brunauer S,Emmett P H,Teller E.Adsorption of gases in multimolecularlayers[J].Journal of the American Chemical society,1938,60:309-319.
[20]近藤精一,石川达雄,安部郁夫.吸附科学[M].李国希,译.北京:化学工业出版社,2005.