Abstract: By means of deepOchannel viscous traction interfacial viscometer and improved measuring method , the surface viscosity of polymer/ surfactant dual system and the interfacial viscosity between polymer/ surfactant and simulation oil have been measured. Results show that the rheological property of surface layer of polymer/ surfactant fluids system is quite different from that of interfacial layer between polymer/ surfactant and simulation oil. The new parameter , dimensionless interfacial viscosity proposed in this paper , can describe the interfacial rheological property better , because it is free from the influence of bulk viscosity. Polymer concentration influences interfacial rheological property remarkably , while polymer concentration located in the two sides of its critical associating concentration , the tendencies of dimensionless surface viscosity and dimensionless interfacial viscosity with surfactant concentration are inconsistent .

Key words: interfacial viscosity, combination chemical flooding, enhanced oil recovery, hydrophobical associating polymer, polymer, surfactant