Experimental Research about High-Concentration Polymer Flooding in 6th Oil Production Plant of Daqing Oilfield

Abstract

In this paper, the high concentration polymer oil flooding experiments were first carried out on two artificial cores that with different Permeability (1000×10-3μm2 and 1700×10-3μm2) by using various concentrations of the polymer respectively(2000mg/L, 3000mg/L, 4000mg/L, 5000mg/L).The relationship between the polymer concentration and oil recovery was given, the upper limit of the polymer concentration was obtained according to the oil displacement efficiency, and the feasibility of the polymer concentration upper limit was investigated. Then it was found that higher produced water polymer concentrations were needed if the same the oil displacement efficiency was reached compared those fresh water polymer solutions by comparing the oil displacement efficiency that using produced water polymer solutions and fresh water polymer solutions.