实用存水率计算新方法及应用

Research on new practical methods to the calculation of water storage percentage and its application

传统存水率和广义存水率各自有其自身的局限性,使得利用存水率这一指标不能对水驱油藏人工注水开发效果进行有效的分析和评价。根据存水率定义的根本目的和出发点,新定义了注水存水率,从根本上解决了该问题,排除了除人工注水驱动能量外的其他驱动能量对存水率计算结果的影响,同时不用考虑层间水及油水同层共生水等对产出水的影响,可用于任何类型油藏的任一开发阶段。提出了水驱指数法和人工注水与天然水侵比例法2种新方法来计算注水存水率,并进行了实例分析,计算相对差值都小于4%,该计算结果可为油藏实时的开发调整提供指导和参考。

The traditional water storage percentage and the generalized storage percentage all has its own limitations,which makes it difficult to analyze and evaluate artificial watur flooding development effect effectively by means of the water storage percentage for waterflooding reservoir.In response to this question.according to the primary purpose and the starting point of the definition of water storage percentage.the new injection water storage percentage is defined.so the question of the limitations of both the tra-ditional and the generalized water storage percentage may be solved fundamentally.and the influence on the calculated water stor-age percentage by other driving energies besides the artificial water flooding energy is eliminated,meanwhile,the influence on the production water by both interlayer water and connate water is not considered.so the injection water storage percentage can be applied to any type of reservoir in any development stage.Two new methods,water drive index method and artificial injection water and natural water influx ratio method.are put forward to calculate the injection water storage percentage.In the end,a successful example analysis is presented with a relative difference within 4%.The study results may offer instruction and reference for the real time development adjustment of oilfield.