A method for oil recovery enhanced foam flooding EOR oil and its preparation method to improve the

The present invention relates to a method for EOR EOR oil and a preparation method of enhanced foam flooding, a foam material displacing agent represented by the following mass percent composition: anionic surfactants 0.2% to 0.95%; nonionic surface active agent 0.01 to 2.0%; water-soluble polymer 0.01 to 0.15%; additive 0.01 to 0.05%; the remaining water to 100%. Displacing agent used in the present invention, the polymer is based on a variety of inter-molecular association and having a complementary structure and good compatibility type weak interaction obtained new enhanced foam flooding system. The system has a salt properties, oil resistance, higher viscosity ultralow interfacial Zhang Li and the like, and is environmentally friendly systems, for field can significantly enhance oil recovery.