Research On Dynamic Response Characteristics Of Polymer Plugging In LD10-1 Oilfield

The development effect of polymer flooding becomes worse in LD 10-1 oilfield,with the liquid producing capacity sharply decreasing and oil production capacity seriously restrained by polymer plugging,therefore it's crucial to find out the polymer plugging position and solve the problems.In this paper,the equivalent characterization methods of the numerical simulation was used to simulate dynamic response characteristics of polymer plugging at the injection side,production end and the different locations between producing and injecting wells,with well index used in single well and conductivity used between the wells to simulate polymer plugging,and combining the solid plugging model in CMG.Based on the numerical simulation results,the theoretical plate of polymer plugging was formed,by analyzing the real data and changing fluid volume and flow pressure into dimensionless type.The real data and the theoretical plate were analyzed to predict the plugging position of producing and injecting wells.And it turns out that most wells have polymer plugging at the production end.It shows that the polymer plugging exists at the production end of A28 and A39 with a liquid decrease after injecting polymer,by comparing the dynamic response characteristics with the simulation results.Since the location is found,the formula for calculating the polymer plugging radius is also established by using the well test technology,combining methods of reservoir engineering and wellbore technology.The method is applied to LD 10-1 oilfield,and the results shows that the blockage radius of A28 well is 2.6m,while the conventional plugging removal radius is generally about 3.0m at present in the offshore oilfield,which shows that the method can provide quantitative support for plugging removal.