应用最优控制理论的油田分布参数估值算法研究
An Algorithm for Oil Field Distributed Parameter Estimation by Means of Optimal-Control Theory
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摘要: 本文将油田分布参数估值问题作为以拟合井位压力历史为目标的最优控制问题处理.提 出两等级交替寻优的参数估值方法.计算例子表明与通常整体估值算法相比,该法能进一步 降低目标函数,提高参数估值精度,所估参数的平均相对误差可小于15%.Abstract: In this paper, the distributed parameter estimation problem in an oil field by matching the history of well pressure data is formulated as an optimal control problem, and a two tier alternated estimation method is put forward. The calculated examples show that the two tier estimation method is better than the original total estimation method. It is able to reduce the objective function and to increase the accuracy of parameter estimation. The average relative error in the estimated parameter values is less than 15 per cent.
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