模拟退火算法在基于非稳态驱替实验的相对渗透率计算中的应用

Application of simulation annealing algorithm in calculation of relative permeability from unsteady-state displacement experimental data

为了提高改进的JBN法测量岩石相对渗透率曲线的质量,将模拟退火算法应用于实验数据的拟合滤波处理中,使得数据拟合光滑处理可以选择任意符合数据分布规律的函数,尤其是不能转化为线性的非线性函数,拓展了改进的JBN法数据处理的适用范围。实际数据处理结果表明,模拟退火算法用于非稳态驱替实验计算相对渗透率曲线是有效和通用的,其滤波处理可以放在计算渗透率前或后,前者对函数的选择要求较严格,否则效果适得其反;后者对拟合函数选择要求较宽,其处理效果一般比前者好。

In order to improve the quality of the relative permeability curve calculated using the modified JBN algorithm from experimental data, the simulation annealing algorithm was adopted to regression data for smoothing, which makes the function fitting in with the data distribution selected haphazardly by regression data for smoothing, The function can be linear and nonlinear. By using the simulation annealing algorithm, the applicability of modified JBN method becomes wide. The experimental data processing case indicates that the simulation annealing algorithm in calculating relative pemleability curve from unsteady-state displacement experimental data is valid and universal. The smoothing can be put before or after the calculation of permeability. The smoothing that is put before calculating permeability requires choosing function strictly, otherwise the effect is opposite. The function selection request is relaxed for the latter of the smoothing and the result is much effective than the anterior one in general .