二次采油与三次采油的结合技术及其进展

THE COMBINATION TECHNIQUE OF SECONDARY OIL RECOVERY WITH TERTIARY OIL RECOVERY AND ITS PROGRESS

二次采油与三次采油的结合技术 (简称“2 +3”提高采收率技术 )是指在充分调剖 ,充分发挥二次采油作用的基础上进行有限度三次采油的技术。该技术由两项技术组成 ,即充分调剖技术和有限度三次采油技术。前者有两个技术关键 :一个是调剖充分程度的判别 ,另一个是堵剂系列的建立。后者也有两个技术关键 :一个是高效驱油剂配方的筛选 ,另一个是驱油剂用量的优化。文中重点介绍了上述技术关键的研究结果 ,其中特别重要的是提出了用注水井井口压降曲线充满度判别调剖充分程度的标准和在有限度三次采油中注入 0 .0 2 Vp 的量化指标。此技术已在老河口油田的试验井组和蒙古林油田的试验区中取得了较好的结果 。

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 0.02 V 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.