特征点拟合法在非牛顿流试井解释中的应用

摘要

在分析幂律流体均质试井模型与幂律-牛顿流体复合试井模型影响因素的基础上,获得了复合驱非线性渗流两种试井模型理论特征点与试井解释参数的关系表达式,通过试井压力导数曲线的特征点坐标可以求取幂律指数、井筒储集系数、表皮系数、渗透率、探测半径、外边界距离等地层参数.两种试井模型的相关实例解释分析表明,非牛顿幂律流均质模型与非牛顿幂律-牛顿流两区复合模型的压力导数特征点求取地层参数的计算式是准确的,可用于聚合物驱等非牛顿渗流条件下的试井解释.%Based on analyzing influencing factors of homogeneous model with power-law fluid and composite model with power-law and Newtonian fluid, the relationships between characteristic points and interpretation parameters have been derived for ASP nonlinear flow well testing. Interpretation parameters can be derived by means of characteristic points' coordinates of pressure derivative curve, including power-law exponent, wellbore storage coefficient, skin factor, permeability, radius of investigation and outer boundary distance. The example result shows: it is reasonable to derive interpretation parameters by characteristic points of pressure derivative. The research applies for ASP well test in the condition of non-Newtonian flow in this paper, and this method makes it possible to analyze ASP well test data fast and easily.