我国东部老油田经过几十年勘探开发,特别是近十几年的高速滚动开发,主力断块均已进入“高含水、高采出程度、高自然递减”开发阶段,加之受断块油藏断层多、断块小、构造和储层复杂等地质特点的影响,形成含油条带窄、单层剩余储量规模小和井间、层间滞留的剩余油分布特征。通过调整井方式已经难以挖掘这部分剩余油潜力,区块调整及措施难度与风险逐年加大,废弃、闲置井明显增加,造成储量资源损失,油田最终采收率难以提高。 After decades of exploration and development in the old oilfields in the eastern part of our country, especially in the past decade or so, the main fault blocks have entered the development stage of “high water cut, high recovery rate and high natural decrement” Reservoir faults, small fault blocks, structural features and reservoir characteristics. The remaining oil distributions with narrow oil-bearing strata, small scale of single-layer remaining reservoirs, and inter-well and inter-strata reservoirs are formed. It is difficult to excavate this part of remaining oil potential by adjusting the well method. The difficulties and risks of block adjustment and measures increase year by year, and the abandoned and idle wells increase obviously, resulting in the loss of reserve resources and the difficulty of increasing the ultimate recovery of oil fields.