Abstract: Most oilfields in China have entered into their mature stage with a high or extra-high water cut after several decades of development. At this stage, the distribution of remaining oil in mature reservoirs is characterized by "highly scattered in the whole field and relatively abundant in some localities". The traditional reservoir description technologies cannot meet the requirement of prediction of the very complicated remaining oil distribution. Therefore, precisely predicting the distribution of scattered remaining oil, especially predicting the locations of these abundant areas, becomes the key to effectively revitalizing mature reservoirs and improving their secondary recovery. It is necessary to get a distinct understanding of the location of the abundant remaining oil by integration of geology, seismic, logging and sophisticated numerical simulation technologies to drill various efficient uneven wells including straight, sidetrack, horizontal and multi-lateral wells in the abundant area of remaining oil or to adopt other comprehensive recovery techniques. In this way, the remaining oil can be produced, and the secondary oil recovery can be improved.

Key words: high water cut oilfield, prediction of remaining oil, application of production seismics, sophisticated numerical simulation, improved secondary recovery

摘要： 经过几十年的开采,我国国内主要的老油田已进入高含水后期甚至特高含水期,地下剩余油呈“整体高度分散、局部相对富集”的状态,传统的油藏描述方法已不能准确地描述和预测处于十分复杂分布状态的地下剩余油。因此,准确预测油层中剩余油、特别是其富集部位的分布状态,将是高含水油田进行调整挖潜、提高注水采收率的基础和关键。因此,综合运用地质、开发地震、测井、精细数值模拟等技术,搞清剩余油的分布状况,在剩余油富集部位钻出各种类型的不均匀高效调整井(包括直井、侧钻井、水平井或分支井)或实施其他综合调整措施,可以更有效地采出剩余油,提高油田注水采收率。

关键词: 高含水油田, 剩余油预测, 开发地震的应用, 精细数值模拟, 提高注水采收率