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本文提出模型参数估计的多步广义梯度法和建模的多层曲线拟合方法，在油田注水系统建模项目中得到成功的应用，所建模型均有很高的精度。
In this paper, we propose a multi-step generalized gradient method for model parameter estimation and a multi-layer curve fitting method for modeling. The proposed method is successfully applied in the modeling of oilfield water injection system. The proposed model has high precision.