聚表二元驱作为一种提高采收率的有效方法已经被广泛应用于各大油田,为实现聚表二元驱生产效益最大化,从油田实际情况出发,将油田开发的经济效益作为优化目标,选取聚合物与表面活性剂的质量浓度、注入体积、注入时机等参数作为调控变量,并结合改进随机差异化步长的SPSA算法进行优化求解,比较约束与不约束聚合物、表面活性剂使用总量.结果表明:随机差异化步长不仅可以加快算法的运行效率而且能更好地实现全局最优性;当不约束聚合物和表面活性剂使用总量时,在含水率越小时实施聚表二元驱,生产效益越好;当约束聚合物和表面活性剂使用总量时,聚合物和表面活性剂使用总量越小,在含水率越大时实施聚表二元驱生产效益越好.%Polymer-surfactant flooding, as a kind of effective method to enhance oil recovery, has been used in oilfield wide-ly. However, at the current low crude oil price scenarios, how to maximize the production benefit (or project economics) has become an emergent problem to solve. In view of this, in this study, the production benefit was taken as the optimization tar-get, and the polymer and surfactant concentrations, injection volume, injection time were considered as control variables, in order to construct a novel simultaneous perturbation stochastic approximation algorithm, which was improved by a random and differential step method to optimize the production benefit. Two case studies were carried out, with and without restriction on the usage of polymer and surfactant. The simulation results indicate that the improved simultaneous perturbation stochastic approximation algorithm not only can speed up convergence but also can get better optimal result. When the usage amount of polymer and surfactant are not restricted, the production benefits will be better if the polymer and surfactant are injected at lower water cut. When the usage amount of polymer and surfactant are restricted, the production benefits will be better if the polymer and surfactant are injected at higher water cut.
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