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针对以往含蜡原油触变模型参数回归中实验数据误差被放大和迭代初值不易选取的问题,以非线性参数回归为框架,引入不适定问题的求解思想,应用求解非线性不适定问题的非线性隐式迭代法,一次性回归Houska触变模型的相关参数。对加剂50 mg/kg的中原原油进行参数回归,所得计算值与实验数据吻合较好,最小相对误差为2.71%(26℃),最大相对误差仅为5.09%(21℃)。该方法回归结果准确、稳定,误差随温度的升高而单调减小,可用于求解含蜡原油触变模型参数的回归问题。
Aiming at the problem that the error of experiment data is enlarged and the initial value of iteration is not easy to select in the regression of thixotropic model parameters of crude waxy crude oil, the nonlinear parameter regression is taken as a framework to introduce the solution of ill-posed problem and to solve the problem of non-linear ill- Linear implicit iterative method, one-time regression to Houska thixotropic model. The parameters of Zhongyuan crude oil with the dosage of 50 mg / kg were regressed. The calculated values agree well with the experimental data. The minimum relative error is 2.71% (26 ℃) and the maximum relative error is only 5.09% (21 ℃). The regression results of the method are accurate and stable. The error decreases monotonously with the increase of temperature, which can be used to solve the regression of thixotropic model parameters of waxy crude oil.