A Laboratory Study of Polymer and Surfactant Binary Combination Flooding in Reservoirs with Low to Medium Permeability

摘要

Based on the viscosity of 10mPa·s after high speed shearing and the limit "surfactants up to ultra-low interfacial tension", polymers and surfactant systems suitable for Longhupao oilfield were optimized by means of mixing formation simulation water with different polymers and surfactants. The relationship between the interfacial tension of the compound system and the component concentration, the effect of surfactants on viscosity, the injectivity of the compound system, etc. were studied on the basis of the research on the binary compound system. The results indicate that the viscosity of the compound system is lower than that of a single polymer solution to a certain degree and the compound system has good migration character in cores. In addition, core flooding experiments on slug combination optimization were made. The experiment results show that the compounded system with pre-pad polymers and surfactants has good oil displacement efficiency and in terms of enhancing the recovery efficiency, chemical flooding should be implemented as soon as possible.