全隐式黑油模型数值试井理论

Numerical Well Test Theory of Black Oil

针对由于地层有效厚度平面分布可能存在很大差异,导致井显式处理的数值试井软件在应用中遇到困难。提出耦合井储的全隐式黑油模型,采用全隐式离散线性化方法,给出变泡点的数值计算格式。利用UST数值试井软件,研究了三相流试井曲线特征。研究表明,当气组分全溶于油相中时,试井曲线特征与单相类似;当发生变泡点时,压力降落趋势缓,压力导数有一个明显的抖动;对油气水三相,压力导数的径向流段明显变长。

Numerical well test is an important tool to interpret the pressure data of the multiphase flow with complex boundary.When the effective thickness of layer changes greatly,numerical well test software will meet some problems during application.A fully implicit black oil model with the method of substitution of variables in modeling variable bubble point is proposed coupling with the well storage.The result shows that when gas disappears,the pressure derivative the has the same characteristics as the pressure derivative of single phase flow,and when the pressure decrease from above to below bubble point,the pressure drop become more slowly and there is a fluctuation in curve the pressure derivative;and when the three phases appear,the length of the radical flow become more long than the other case.