Polymer flooding development practice and understandings of heavy oil reservoirs with strong edge water in fault-blocks of Shuanghe oilfield

Oil reservoirs of He 2 member in Shuanghe oilfield was characterized by multiple layers,small oil-bearing area in single layer,severe heterogeneity and active edge water,which belonged to typical small fault-block oil reservoir with strong edge water,with high comprehensive water cut and worse development effect year by year.Therefore,a series of techniques such as edge water control technique,well pattern adjustment technique,injection-production parameters optimization technique,frontal slug optimization technique and reasonable proration and injection allocation technique.Practice indicated the polymer flooding could effectively improve the ultimate recovery of small fault-block oil reservoirs with strong edge water.