沥青在石英砂上吸附特征和润湿性的微观研究  

Adsorption characteristics of asphaltene on silica sand and wettability by SEM

作　　者：段秋者[1] 董兆雄[1] 罗平亚[1] 叶仲斌[1] 孙良田[1] 梁保升[1] 

机构地区：[1]西南石油学院石油工程学院,四川南充637001

出　　处：《电子显微学报》2001年第4期283-286,共4页Journal of Chinese Electron Microscopy Society

基　　金：国家 973基金资助项目 (G19990 2 2 5 11)"大幅度提高石油采收率的基础研究"

摘　　要：The adsorption and deposition of asphaltene and resin from crude oil on reservoir rocks is a major factor in wettability changes. The microstructure of asphaltene adsorption from 600mg/L asphaltene simulated oil on the silica sand is visualized clearly through scanning electron microscope(SEM). The results show that silica immersed in the asphaltene simulated oil for 70 days adsorb asphaltene by adsorption film with various thickness. The silica sands in an ascending order of asphaltene adsorption film thickness are the silica sands pretreated by 12% NaOH solution, 10% HCl solution, and 10% HCl plus 12% NaOH solution successively. The differences of hydroxy silanol group states and the electric characteristics of the silica sand surface pretreated by three different approaches lead to the distinctions of asphaltene adsorption. Furthermore, there always exist some sand grains and/or specific parts of a sand grain with no asphaltene no matter which method is adopted to pretreat the silica sands, which indicates the adsorption of asphaltene and resin on the silica sand is heterogeneous. In the actual oil reservoir, reservoir rock is presumably mixed wettability.The adsorption and deposition of asphaltene and resin from crude oil on reservoir rocks is a major factor in wettability changes. The microstructure of asphaltene adsorption from 600mg/L asphaltene simulated oil on the silica sand is visualized clearly through scanning electron microscope(SEM). The results show that silica immersed in the asphaltene simulated oil for 70 days adsorb asphaltene by adsorption film with various thickness. The silica sands in an ascending order of asphaltene adsorption film thickness are the silica sands pretreated by 12% NaOH solution, 10% HCl solution, and 10% HCl plus 12% NaOH solution successively. The differences of hydroxy silanol group states and the electric characteristics of the silica sand surface pretreated by three different approaches lead to the distinctions of asphaltene adsorption. Furthermore, there always exist some sand grains and/or specific parts of a sand grain with no asphaltene no matter which method is adopted to pretreat the silica sands, which indicates the adsorption of asphaltene and resin on the silica sand is heterogeneous. In the actual oil reservoir, reservoir rock is presumably mixed wettability.

关 键 词：沥青 石英砂 吸附特征 润湿性 微观研究 扫描电镜观察 

分 类 号：O647.3[理学—物理化学]