考虑层间窜流的多层多相数值试井方法研究

Study on multi-layer and multi-phase numerical well testing method for inter-layered channeling

考虑层间窜流的影响,建立了多层多相数值试井理论模型,考虑方程离散的精度和解的稳定性,采用混合网格,给出了压力降落和压力恢复试井的多层多相产量模型的处理方法及与控制方程相耦合的方法。对比分析了层间窜流对压力恢复和压力降落试井曲线形态的影响,给出了压力场和饱和度的空间分布,实现了由单纯的单次试井解释曲线及解释参数分析向试井解释参数、试井解释曲线及压力场和饱和度空间分布对比分析的拓展。通过实例分析,研究了层间渗透率差异、层间窜流以及不同的含油饱和度分布对试井曲线形态的影响。

This paper sets up a multi-layered and multi-phased four-dimensional numerical well test model, taking into the consideration of the crossflow between layers. The paper applies the hybrid grid to construct rate model and discretize the governing equations. The type curves for buildup and drawdown tests at different stage, the distribution of saturation and pressure at different time are compared for the cases with and without crossflow. The method makes it possible to relate testing analysis at different time, which is very important for analyzing history of the distribution of saturation and pressure.