Co-adsorption behavior of aggregated asphaltenes and silica nanoparticles at oil/water interface and its effect on emulsion stability  

作　　者：Guang-Yu Sun Hao Zhang Dai-Wei Liu Chuan-Xian Li Fei Yang Bo Yao Ze Duan Xin-Ya Chen Fu-Jun Sheng 

机构地区：[1]College of Pipeline and Civil Engineering,China University of Petroleum(East China),Qingdao,266580,Shandong,People's Republic of China [2]Shandong Key Laboratory of Oil&Gas Storage and Transportation Safety,Qingdao,266580,Shandong,People's Republic of China

出　　处：《Petroleum Science》2022年第4期1793-1802,共10页石油科学（英文版）

基　　金：Support from the National Natural Science Foundation of China(Grant No. 51704315)。

摘　　要：In petroleum industry, crude oil emulsions are commonly formed in oilfields. The asphaltenes and fine particles in crude oil may affect the stability of the emulsions by adsorbing at the water/oil interface. In this research, the effect of silica nanoparticles and asphaltenes on emulsion stability is explored first. The asphaltenes are proved to benefit emulsion stability. Unlike the asphaltenes, however, the modified silica nanoparticles may have positive or negative effect on emulsion stability, depending on the asphaltene concentration and aggregation degree in the emulsions. Further, it is confirmed by conducting interfacial experiment that the asphaltenes and particles can adsorb at the interface simultaneously and determine the properties of the interfacial layer. More in-depth experiments concerning contact angle and asphaltene adsorption amount on the particles indicate that the asphaltenes can modify the wettability of the particles. Higher concentration and lower aggregation degree of the asphaltenes can increase their adsorption amount on the surface of particles and then improve the modification effectiveness of the particles. Resultantly, the particles with good modification effectiveness can enhance the emulsion stability while the particles with poor modification effectiveness will weaken the emulsion stability.

关 键 词：ASPHALTENE Silica nanoparticle Co-adsorption behavior Modification effectiveness Emulsion stability 

分 类 号：TE31[石油与天然气工程—油气田开发工程]