关键词: 含氟表面活性剂 , 接触角 , 石英表面 , 驱油效率

Abstract: The wetting properties of quartz surface modified by adsorption films of fluorosurfactants were investigated using the sessile drop analysis. The influences of temperature and different electrolytes were expounded and laboratory simulation of displacement testing was carried out. The results show that zwitterionic fluorosurfactant FO1 will effectively alter the wettability of quartz surface. FO1 can both modify the quartz surface from hydrophilic surface to neutral one in distilled water and formation water. Meanwhile, FO1 shows better heat resistance and salt tolerance. The result of laboratory simulation of displacement experiment show that the core surface is controlled in slightly waterwetting by zwitterionic fluorosurfactan solutions, which is beneficial to the removing of the water film from core surface and reducing the percolation resistance of water flooding, and results in decrease of water injection pressure and enhancement of the oil recovery.

Key words: Fluorosurfactant,    , Contact angle,    ,  Quartz surface,   ,  Oil displacement efficiency