Analysis of Oil Displacement Efficiency of Subsequent Water Flooding Reservoir by Polymer Flooding

Abstract After many years of development of basic well pattern and polymer flooding, the block reservoir has high comprehensive water cut, high water flooded degree and high proportion of water absorbing thickness of high permeability reservoir. In this paper, the water flooding characteristics of each sedimentary unit in the subsequent water flooding reservoir of polymer flooding, the existence and quality of oil in pores, the oil displacement efficiency and the factors affecting the oil displacement efficiency are analyzed based on the data of water flooded layer of updated wells and the coring data of new wells in recent years.