Application Technology Research Of EOR In M Block Multi-layer Production Well

This article carried out an indoor experimental study on enhanced oil recovery in Block M in Jinzhou Oil District.Through laboratory experiments,the differences were screened.It was proposed to use a binary polymer system to maintain a certain concentration and quality of polymer that remains in the rock pores during the displacement process.Plugging the technical route.Through the screening of experimental agents,a blocking agent that can make residual polymer flocculate in the rock pores was developed.Through the core simulation evaluation experiment,the injection parameters of the agent were optimized.The results show that the selective block adjustment technology after the M block dual flooding can improve the sweep coefficient and oil washing efficiency of the displacement fluid and further increase the oil recovery.In this paper,taking the Jinzhou block of Liaohe Oilfield as the research object,the technical route to profile control and water shut-off was formulated by using polymer with certain concentration and quality that remained in the rock channel during the displacement process.The function of the plugging agent is to make the residual polymer coagulate in situ in the rock pores,and it can be developed through a coagulant screening experiment.The injection parameters of the coagulant need to be optimized,and can be completed through a core simulation evaluation experiment.The following two conclusions can be drawn through the experiment: First,the flooding coefficient and the oil washing efficiency of the flooding zone of the block can be improved,thereby further improving the recovery factor.Second,the zinc salt solution is the best formulation for the coagulant;the optimum forward injection volume PV number of the coagulant is 0.5;the optimal inverse injection volume PV number is 0.5.