Abstract: There are some prominent problems nowadays that water cut rises quickly and the recovery percent is low for some fields put into production in Bohai offshore oilfield. And because of the limit of the platform life span, an offshore oilfield will be developed for only twenty years. So it is a difficult technology problem to be solved that how to produce more oil as quickly as possible during the platform life span. Through analyzing the geology and reservoir quality of LD10-1 oilfield, the reasonable geologic model and reservoir numerical model are developed, based on which the optimized design study of polymer flood project has been carried out, and finally the recommended projects are given in this paper. The study indicates that it is feasible to early inject polymer at LD10-1 oilfield, but it has some difficulties that both the polymer injection rate and the slug quality concentration cannot be very high.

Key words: platform life span, geologic model, polymer, injection rate, slug, quality concentration