Performance evaluation and mechanism analysis of ASP system with high concentration

Aiming at actual demand of oilfields, the viscosity, interfacial tension, static adsorption property, rheological behavior and flow characteristics of alkali/surfactant/polymer (ASP) system have been evaluated through instrument test and theoretical method. The results showed that with the increase of alkali concentration, viscosity and interfacial tension of ASP system decreased. With the increase of surfactant concentration, viscosity and interfacial tension of ASP system decreased. With the increase of surfactant concentration, viscosity of ASP system first decreased then increased, and interfacial tension decreased. In the ASP system, static absorption of surfactant was the largest, then alkali followed and polymer came last. With the increase of alkali concentration, viscoelasticity of ASP system decreased. Surfactant had little impact on the viscoelasticity of Asp system. As is showed in flow characteristics experiments, resistance coefficient and residual resistance coefficient of ASP system decreased after descaling of solvent water. With the decrease of alkali concentration, polymer concentration increased and core permeability decreased, resistance coefficient and residual resistance coefficient of ASP system increased. With the increase of surfactant concentration, resistance coefficient and residual resistance coefficient of ASP system first decreased then increased.