Abstract: Based on lab tests, numerical analog and field tests in Pubei area，the effect of crosslinked polymer depth profile control on IOR has been analyzed in this paper in respect to the change of target bed of profile control in profile control well,fluid entry profile of non-target bed and production performance of the test area. The results show that depth profile control should firstly operated in high water cut thick oil zones for the field with the sand body mainly being underwater distributary channel sand and being stripped like, and with water driving direction being fairly single. And then the successive water flood can be performed to the whole well. This is effective to improve the development of oil filed at high water cut stage. The method is important for lOR and has a potential to be widely used.

Key words: crosslinked polymer, depth profile control, effect analysis, recovery factor