Experimental Study on Deep Profile Control Technique of Inverse Polymer Emulsion

Under the condition of ambient temperature, inverse polymer emulsion was a stable water-in-oil emulsion. According to the reservoir characteristics in Gudao Oilfield, the adaptability of profile control agent was evaluated in laboratory, the phase transform and gelling time of simulated strata were more than 3d, the drag coefficient from single core plugging test was 10.4, after 3 string polymer flooding, the ultimate recovery percent was 13%. It indicates that the deep profile control can be effective by using the polymer system. After it is used in 6 wells, oil pressure goes up 1.8MPa in average in water injection wells, water cut reduces 3.4% in response wells within the validate period, single well oil increases 377t in average.