Study The Performance Evaluation Of The New Chemical Flooding For Developmenting Offshore Heavy Oil Reservoir

The Bohai oilfield have heavy oil reserves,water drive recovery factor is just about 20%.Especially for viscosity is higher than 150 mPa·s.Oil chemical flooding not formed scale application in Bohai oilfield due to the restriction of chemical agent.CNOOC research institute developed a new type of oil displacement agent called EHA-1 for application.This article had carried out a series of simulation experiment in order to evaluate and utilizatethe new type of oil displacement system(EHA-1)better.Including the static performance,reservoir compatibility and oil displacement efficiency of oil displacement system(EHA-1).And this is for the application of new type of oil displacement system.The results show that: 1)Has been clear about the New type of oil displacement agent is a kind of shear thinning andnon-Newtonian fluid,viscosity increasing effect is poorer,but the interfacial tension of crude oil is lower.The EHA-1 can cut crude oil and made it become a continuous phase to reduce the viscosity effectively.2)Water dynamics feature sizes of EHA-1 is about 10~20μm.In article also valuate the injection and the liquidity of EHA-1 so as the reservoir matching chart.3)Clear the EHA-1 and activation of heavy oil can improve injection profile and control the mobility.4)The EHA-1 improve oil recovery than water-flooding,shows that the EHA-1 has a good wash oil.5)Using saturation monitoring technology,the EHA-1 has both of expand sweeping volume and enhance oil displacement efficiency function.Plane model experimental results show that the EHA-1 drive 14.56% higher than that of water flooding,including 28.4% of expanding sweeping volume and 71.6% of enhancing oil displacement efficiency.