关键词: 调剖, 堵水, 二次采油, 三次采油, 提高原油采收率

Abstract: The combination technique of secondary recovery with tertiary recovery is called as the "2+3" technique for enhanced oil recovery in short.The said technique is referred to the technique which bases on full profile control (fully playing the role of secondary recovery) and conducts the limited tertiary recovery. The "2+3" technique is composed of two parts:the one is the technique of full profile control and the other is the technique of the limited tertiary oil recovery.The former deals with two technical keys which are the distinguishing the full degree of profile control and establishing the systems of plugging agent;the later also deals with two technical keys which are the screening the high effective formulations for oil displacement and the optimizing amount of oil displacement agent.This paper introduces the researching results of these technical keys in which the criterion for distinguishing the full degree of profile control by the full degree of the pressure drop curve at the wellhead of the injector and the quantitating injection index of the 0.02V_p in the limited tertiary oil recovery are specially important.The "2+3" technique has been conducted in the test well group of Laohekou Oilfield and the pilot of Menggulin Oilfield.The good results have been obtained and the feasibility of the "2+3" technique has been confirmed

Key words: profile control, water shutoff, secondary oil recovery, tertiary oil recovery, enhanced oil recovery