Abstract:

Oil displacement mechanism of quaternary cationics has been studied in several ways: surface and interface tension, wettability, surface electrical behavior. It’s thought that there has been low interface tension mechanism, wetting conversion mechanism and surface electrical conversion mechanism while displaced by the surfactants. When the concentration of the surfactants is as high as 600 mg•L-1, the oil recovery increment of 5%-6% is available. It is expectable that cationic surfactants with adsorbance property probably have such mechanisms in oil displacement, and have some potentiality.

Key words: quaternary cationics, low interfacial tension, wetting conversion, surface electrical conversion