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描述了一个3参数模型,该模型建立了水驱油藏或油田含油率递减与分流量采收率的关系。模型推导出预测水驱油藏采油量和产水量的方程,也可以用这些方程设计油田开采期限内任何阶段的水驱扩大项目。可以用这些模型方程估算老油田任何阶段的原油储量。用最小二乘方算法,通过模型方程与油田历史数据的拟合,得到了模型参数。用标准曲线法得到了数学算法所需的模型参数的最初猜测。推导出用于总液体流量稳定情况的含油率递减模型和典型的产量-时间递减之间的关系式。介绍了巴西几个油田含油率递减的实例,并且用递减模型确定了这些油田的最终采收率。最终采收率与油田开采期限内的产水量成正比,这与油田废弃条件下的水油比有关。当油田开采条件改变时,含油率递减趋势也改变。
A 3-parameter model is described that establishes the relationship between decreasing oil-in-water ratio of oil-flooded reservoirs and oilfields and oil recovery. The model derives equations that predict oil production and water production in a waterflooding reservoir. These equations can also be used to design waterflooding expansion projects at any stage of the field’s exploitation horizon. These model equations can be used to estimate the crude oil reserves of any stage of the old oilfield. Using the least squares method, the model parameters were obtained by fitting the model equations with the historical data of the oil field. The initial guess of the model parameters required for the mathematical algorithm is obtained using the standard curve method. The relationship between the model of decreasing oil content for a constant total liquid flow rate and the typical yield-time reduction is derived. Some examples of declining oil rates in several fields in Brazil are presented and the final recovery rates for these fields are determined using a decreasing model. The ultimate recovery ratio is directly proportional to the amount of water produced during the oilfield mining period, which is related to the water-oil ratio under the conditions of oilfield waste. As oil field mining conditions change, the decreasing trend of oil content also changes.