Method to Tap Remaining Oil in Complex Fault-Block Reservoirs at High Water Cut Stage
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摘要: 复杂断块油藏进入高含水期,剩余油分布复杂,挖潜难度大,为提高水驱采收率,提出了将研究单元细化到油砂体的剩余油精细挖潜方法。在精细地质研究的基础上,结合生产动态数据和测试资料,根据油砂体上井网控制情况、水驱特征和边水能量特征,将油砂体划分为弹性驱、注入水驱、注入水+边水驱、边水驱和未动用等类型,详细解剖不同类型油砂体的动用情况,分析不同类型油砂体的剩余油分布模式和潜力,提出了不同类型油砂体的剩余油挖潜方法。利用该方法对跃进2号油田的剩余油进行了挖潜,水驱效果大大提高。研究表明,以油砂体为对象的剩余油挖潜方法可以有效提高复杂断块油藏高含水期的开发效果,为剩余油的挖潜提供了新的思路。Abstract: During high water cut stage,it is very difficult to develop the remaining oil in complex fault-block reservoirs due to its complicated distribution.In order to enhance recovery,this paper presents a method on tapping remaining oil by refining research unit into oil sand body.On the basis of fine geological research along with dynamic and test data,oil sand bodies are divided into elastic drive,injected water drive,injected water and edge water drive,edge water drive,and nonproducing types according to well pattern control conditions,features of water drive and edge water energy.Specific methods of tapping remaining oil for specific oil sand body types were advanced through dissection of producing status,remaining oil distribution pattern and potential of different oil sand bodies.The application in Yuejin II Oilfield shows that the method can effectively improve development of complex fault-block reservoirs in high water cut stage and provides new approach for tapping remaining oil.
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