底水油藏特高含水期认识剩余油潜力的新方法

Recognizing Remaining Oil Potential in Ultra-high Water Cut Stage of Bottom Water Reservoir

针对底水油藏进入特高含水期后,剩余油的潜力在油田开发后期调整挖潜过程中是至关重要的,提出了计算其剩余潜力的新方法。从底水油藏的过水倍数和驱油效率的定义出发,利用达西定律和物质平衡理论,推导出底水油藏过水倍数与驱油效率的关系式,提出采用拟合实际动态的遗传算法和正交试验设计方法求解关系式。通过实例表明,运用该方法可以找到油田特高含水期时的剩余油潜力,指导油田制定下一步调整挖潜方案。

When bottom water reservoir enters ultra-high water cut stage,the potential of remaining oil becomes vital to the process of adjusting and tapping in the later stage of oilfield development.Based on the definition of water breakthrough multiple and oil displacement efficiency of bottom water reservoir,the relationship between water breakthrough multiple and oil displacement efficiency is derived by using Darcy's law and material balance theory.The genetic algorithm and orthogonal experimental design method is used to solve the relationship.The example shows that the method can find the remaining oil potential in ultra-high water cut stage,and guide the oilfield to formulate the following adjustment and tapping potential plan.