Phase behavior and structure analysis of the middle mixed layer for ASP flooding system at low surfactant concentration  

作　　者：牟建海 李干佐 廖广志 黄丽 赵孔双 

机构地区：Key Laboratory for Colloid and Interface Chemistry of the Ministry of Education, Shandong University, Jinan 250100, China[1] Research Institute of Exploration & Development, Daqing Petroleum Administrative Bureau, Daqing 163712, China[2] Department of Chemistry, Beijing Normal University, Beijing 100875, China[3]

出　　处：《Science China Chemistry》2002年第2期184-190,共7页中国科学（化学英文版）

基　　金：This work was supported by the Visiting Scholar Foundation of Key Laboratory in Chinese University, and the Key Laboratory of Oil & Gas Reservoir Geology and Exploitation of Southwest Petroleum Institute.

摘　　要：The phase behavior and interfacial tension of alkali/surfactant/polymer (ASP) flooding system and simulative crude oil were investigated, and the size distribution and structure analysis of the middle mixed layer (MML) were also studied by size analyzer and freeze-fracture TEM. It was found that there were some rules between the volume of MML and the concentration of each component, and the interfacial tension between MML and the oil phase or water phase could reach an ultra-low value. Especially, the freeze-fracture TEM micrographs of MML were firstly obtained, and the new viewpoint was put forward that there coexist the structures of micelle, microemulsions and emulsions in MML and the structure of microemulsion is dominant. This would make an important effect on the research of surfactant theory and ASP flooding mechanism.The phase behavior and interfacial tension of alkali/surfactant/polymer (ASP) flooding system and simulative crude oil were investigated, and the size distribution and structure analysis of the middle mixed layer (MML) were also studied by size analyzer and freeze-fracture TEM. It was found that there were some rules between the volume of MML and the concentration of each component, and the interfacial tension between MML and the oil phase or water phase could reach an ultra-low value. Especially, the freeze-fracture TEM micrographs of MML were firstly obtained, and the new viewpoint was put forward that there coexist the structures of micelle, microemulsions and emulsions in MML and the structure of microemulsion is dominant. This would make an important effect on the research of surfactant theory and ASP flooding mechanism.

关 键 词：ASP FLOODING system  phase behavior  microemulsion  emulsion  FREEZE-FRACTURE TEM. 

分 类 号：O647[理学—物理化学]