Abstract: Extra high water cut has been the main development stage of bottom⁃water reservoir, due to water cut highly with great escalating rate in the initial. At present, the relative permeability curve endpoint has become a serious distortion. This paper presents a method to calculate the performance of water cresting with two phases flowing using the streamlines theory, good for solving the existing problems in the common method, as no pertinence, ineffectiveness and less affecting factors considered. Meanwhile, optimized relative permeability curve was calculated based on the research coupling genetic algorithm with bottom⁃water drive model. The result of numerical calculation based on optimized relative permeability curve showed that the histogram of technical reserves was matched basically with the real practice. This research could provide some instructional meaning to the application of dynamic prediction and developing the oilfield in bottom⁃water reservoir.

Key words: Relative permeability curve, Quasi?streamline method, Horizontal well, Water cut, Genetic algorithm

摘要： 底水稠油油藏生产特征表现为初期含水上升快，开发的主要阶段为特高含水期。该类型油藏处于特高含水期时，依据行业标准测得的相渗曲线残余油饱和度端点值偏低，常规相渗曲线计算开发指标方法针对性不强，导致预测开发指标与油田实际动态规律不符。对此，结合底水油藏水平井油水两相渗流规律，建立了底水油藏水平井流管模型，通过拟合实际生产数据，利用遗传算法反求相渗曲线特征参数最优解，实现特高含水期相渗曲线的重构。数值模拟结果表明，利用该方法得到相渗曲线更加符合油田的实际生产规律，可为该类型油藏处于特高含水期时的动态预测及精细挖潜提供参考。

关键词: 相渗曲线, 流管法, 水平井, 含水率, 遗传算法