A novel surface active polymer oil displacement agent

Abstract

Based on the relationship between the molecule structure of monomers and their performance, two types of polymerizable monomers with low oil/water interfacial tension have been synthesized, which coplymerizes acrylamide to synthesize a novel polymer oil displacement agent under compound initiator and low polymeric temperature. Its structure and distribution status in brine solution were characterized by infrared spectroscopy and freeze etching electron microscope. The results show that the polymer has good water solubility, viscosifying properties, salt-resistance and temperature-tolerance, shearing-resistance in brines. Due to the graft polymerization of acrylamide and the polymerizable surface-active monomers, the polymer overcomes chromatographic separation effect, and has low oil/water interfacial tension. Interfacial tension of 0.15% polymer solution (prepared in Daqing simulation brine) is around 10−1 mN/m in Daqing No.1 oil plant crude oil. Core flooding experiments show that the oil recovery of the novel surface active polymer is 5.2% higher than that of ordinary hydrolyzed polyacrylamide because of its better viscosifying performance and lower oil/water interfacial tension. Key words: oil displacement agent, polymer, interfacial tension, recovery factor