【摘要】 特高含水期油藏经过长期注水开发,在平面、纵向上存在驱替不均衡现象,影响水驱开发效果。为了达到均衡驱替的目的,利用数值模拟技术提出了驱替倍数量化表征方法,识别表征油藏不同位置处驱替程度的差异,根据驱替倍数与剩余油饱和度及采出程度的关系对其进行分级评价,将特高含水期油藏分为弱驱富集区、强驱替区、高耗水区和无效注水4个区域,并确定了不同区域驱替倍数的分布模式,在此基础上形成了提高弱驱富集区驱替倍数,转变强驱替区液流方向,注采调配控制高耗水区,封堵调控遏制无效注水等均衡驱替技术对策。针对双河油田Ⅷ-Ⅸ油组提出了井网调整优化方案,现场实施后提高水驱采收率1.43%,应用效果较好。更多还原

【Abstract】 After the long-term water flooding,the oil reservoirs in the ultra-high water cut stage have unbalanced displacement in the plane and vertical direction,which affects their development effect.In order to achieve the equilibrium displacement,a numerical simulation technique was proposed to quantitatively characterize the displacement multiple and identify the difference in the displacement degree at different positions of the reservoir.According to the relationship among displacement multiple,residual oil saturation,and percentage recovery of OOIP,the displacement multiple was graded and evaluated.The ultra-high water cut reservoir was divided into four zones:weak displacement zone,strong displacement zone,high water consumption zone,and ineffective water injection zone.The distribution pattern of displacement multiple in different zones was determined,basis on this,the strategies for improving the displacement multiple of the weak displacement zone,changing the direction of liquid flow in the strong displacement zone,controlling the high water consumption zone by injection and production,and restraining and regulating the ineffective water injection were formed.The well pattern adjustment and optimization scheme of theⅧ-Ⅸoil zones in Shuanghe Oilfield was proposed.After the implementation,the waterflood recovery factor was increased by 1.43%,which achieved good application results.更多还原