三维两相流数值试井模型

建立了基于混合PEBI网格的三维两相流数值试井模型 ,内容包括 :物理模型的建立 ,网格剖分方法 ,控制方程的离散格式以及内、外边界的处理方法。用单相流双重介质和双渗介质解析解对模型的计算结果进行了验证。对 3层油藏两相流试井曲线特征分析发现 ,多层两相流动试井曲线特征与单相流动双重介质的曲线特征相似。因此 ,有可能寻求一个参数关系将双重渗透介质试井问题与三维两相流试井问题联系起来 ,从而减小多相流试井分析的难度和多解性。径向PEBI混合网格与数值试井模型的结合应用 ,给出了三维两相流、有井筒存储和表皮效应的不稳定渗流产量隐式表达式

Three-dimensional two-phase-flow numerical well testing model

A three-dimensional two-phase-flow well testing model based on hybrid PEBI was built. This model involves physical model, grid techniques, discretization of governing equations and the methods for dealing with inner and outer boundaries. The analytical results of single-phase flow in dual-porosity and dual-permeability media were used to verify the model. The well test analyses on two-phase flow in three layers of reservoir show that the characteristic of multi-layer two-phase flow is similar to that of the single-phase flow in dual-porosity media. So, it is possible to correlate these two kinds of flows and then to reduce the poly-keys problem and make it easier for the interpretation of multi-phased transient test. The combination of numerical well testing model with radial-PEBI hybrid grid can solve the problem of the implicit rate of the flow with skin effectiveness and storage for multi-layer two-phase transient test.