The Study of Optimization Experiment on Injection Timing and Injection Pattern of Binary Compound Flooding after Polymer Flooding of Heavy Oil in Offshore Field

Abstract

In this study, simulated the reservoir conditions of SuiZhong 36-1 offshore field, we did the research on the optimization experiment of injection timing and injection pattern of the binary composite flooding after polymer flooding. After polymer flooding the launching of binary compound system is studied at the different injection timing (namely when the water content ratio is 0%, the lowest point , 70% and 95% after polymer flooding), the results show that the final recovery efficiency is the highest while directly conversion after polymer flooding, followed is conversion while the water content ratio is the lowest ,70%and 95%..Also compared the impact results of injection of binary complex system in different injection ways on oil displacement effect, the result shows that the injection of 0.3 PV binary complex system is better than the system of polymer injection 0.05 PV + 0.2 PV binary compound system + 0.05 PV polymer binary and 0.1 PV polymer + 0.2 PV binary compound system. But the impact of changing injection way on the ultimate recovery is not big, do before and after protection in a polymer slug is more advantageous to control the cost of industrialization, to maximize the overall benefits of oilfield development.