应用电容电阻模型研究大型成熟油田井间连通性

Application of capacitance resistance models to interwell connectivity of large-scale mature oil fields

针对电容电阻模型在大型成熟油田应用时存在的问题,选用了生产井电容电阻模型(CRMP),提出了其在大型成熟油田的简化应用方法,并进行了实例分析。结合大型成熟油田的特征,给出了CRMP简化推导方法。通过优化求解方法缩短求解时间、提高收敛速率,包括应用全局优化算法,计算CRMP目标函数的解析梯度向量及Hessian矩阵并应用于解算器中,进行参数缩放等,使CRMP可以应用于大型油田。通过逐步历史拟合可提高CRMP模拟结果的可靠性。实例分析结果表明,采用该方法得到的连通性分析结果与生产实际相符,验证了该方法的可靠性。根据CRMP模拟结果,可以有效分析注入井与其周围生产井的连通性,并进行相关分析,例如判断哪些注水井可以改注二氧化碳以及某二氧化碳注入井是否适宜注二氧化碳等。

In view of the problems existing in the application of Capacitance Resistance Models （CRMs） to large-scale mature oil fields, Capacitance Resistance Model for Producers （CRMP） was selected for analysis, a simplified procedure for applying CRMP to large-scale mature oil fields was proposed, and some examples analyzed. A simplified derivation for CRMP was presented with consideration of characteristics of large-scale mature oil fields. Several strategies were presented to optimize the solution method, in order to shorten the solution time and speed up convergence rate. These include the implementation of a global optimization algorithm, parameter scaling, analytical development of gradient vector and Hessian matrix of the CRMP objective function and so on. These improvements enable the application of CRMP to large-scale problems. Stepwise history matching was shown to be an effective technique to improve reliability of the analysis. Example analysis results show that, the connectivity got by the presented method agrees with the practical production, which proves the reliability of the presented method. The connectivity of an injector to the nearby producers can be analyzed based on the CRMP simulation results, and the analysis results can be used for related study, such as determining current water injectors suited for CO2 injection, or current CO2 injectors not suited for CO2 injection.