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CO2在页岩中的吸附解吸性能评价
孙宝江,张彦龙,杜庆杰,沈忠厚
0
(中国石油大学石油工程学院,山东青岛 266580)
摘要:
利用自主设计的页岩中气体吸附解吸实验装置,在不同温度和压力条件下研究CO2在不同页岩中的吸附解吸性能。结果表明:CO2在页岩上的等温吸附曲线属于典型的Ⅰ型等温曲线,可采用Langmuir模型对吸附及解吸数据进行拟合;相同温度下,CO2在页岩中的吸附量随着压力的升高而增大;相同压力下,CO2在页岩中的吸附量随着温度的升高而减小;相同温度压力条件下,CO2解吸过程中存在解吸滞后现象,且解吸附曲线表征的最大吸附能力低于吸附曲线表征的最大吸附能力;CO2在页岩上最大吸附量随有机碳含量增加而增大,随石英含量增加而减小。
关键词:  二氧化碳  页岩  吸附解吸  解吸滞后
DOI:10.3969/j.issn.1673-5005.2013.05.014
投稿时间:2013-06-23
基金项目:国家自然科学基金重点项目(51034007,U1262202);山东省自然科学基金项目(ZR2012EEQ2008);教育部创新团队项目(RT1086)
Property evaluation of CO2adsorption and desorption on shale
SUN Bao-jiang,ZHANG Yan-long,DU Qing-jie,SHEN Zhong-hou
(School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China)
Abstract:
Laboratory shale cores adsorption and desorption experiments with CO2were carried out using the self-developed experimental device of gas adsorption and desorption on shale under different pressure and temperature. The results show that the adsorption isotherms of CO2on shale are the representative type Ⅰ curves, and the adsorption and desorption curves are in line with the Langmuir model. The adsorption capacity of CO2on shale increases with the pressure increasing under the same temperature, while it decreases with the temperature increasing under the same pressure. At the same temperature and pressure, the desorption curves exhibit hysteresis phenomenon, and the maximum CO2adsorption capacity characterized by the desorption curve is less than that characterized by adsorption curve. The maximum CO2adsorption capacity increases with the total organic carbon (TOC) content in shale increasing and decreases with the inorganic mineral content increasing.
Key words:  CO2  shale  adsorption and desorption  desorption hysteresis
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