The influences of the polymeric surfactant on the interface properties of simulation produced liquid during polymeric surfactant flooding were studied in the paper. These interface parameters were interfacial tension

diffusion zeta potential

interface viscoelasticity and strength of interface film. The influence law of polymeric surfactant on properties of oil-water interface was investigated. The results showed that polymeric surfactant with surfactant and polymer performance was adsorbed at oil-water interface for amphiphilic properties

and the stable interface film was formed. The interfacial tension of simulation produced liquid during polymeric surfactant flooding was reduced

and the interfacial strength increased. Moreover

the interfacial tension was decreased

and the strength of interface film was increased with the increasing of the concentration of polymeric surfactant. Among the four types of studied polymeric surfactant

the effect of Ⅲ(O/W) polymeric surfactant on the interface properties of simulation produced liquid during polymeric surfactant flooding was better than other polymeric surfactant.