Through the laboratory experiment, the foaming properties of six kinds of foaming agent was evaluated comprehensively. Through the primary selection, foaming agent concentration selection and salt tolerance evaluation, HY-2 foaming agent was selected in follow-up experiments. The Liquid viscosity effect for foaming performance showed that there exists an optimal value of the liquid viscosity, corresponding to the concentration of foam stabilizing agent should not be less than 700mg/l. The impact of temperature on the performance of foaming agent was mainly on the foam stability, the higher the temperature, the stability of the bubble the worse. Due to the presence of crude oil, foaming volume and stability of the foam appeared a downward trend, the character of which is very advantageous to adjust fluidity difference between the layers of high permeable formation and low permeable formation.

CO2 flooding has been widely used in oil field development, but the produced fluid is easy to cause corrosion of tubing and casing. In order to determine the corrosion behavior of produced fluid on J55 steel during CO2 flooding, we use the simulated oil well produced fluid as corrosive medium and conduct the corrosion simulation experiment at high temperature and high pressure. The experimental results showed that the crystalline grain size of corrosion film surface is different for the different CO2 partial pressure. When CO2 partial pressure is greater than the critical pressure, the crystalline grain is not oblique six-party crystal structure, and the grains become small and compact, so the corrosion product film should have a good corrosion inhibition. Both static and dynamic corrosion of samples are serious. The research has a theoretical guiding significance on corrosion protection during CO2 flooding.