含蜡原油再启动过程流型分析

Flow Study of Restart of Waxy Crude Oil

为研究含蜡原油管道再启动过程,分析了压力沿管道的传播、原油的屈服、黏度由初始状态裂降至平衡状态和管道的清管四过程。根据流体连续性方程、运动方程及流变性方程,建立压力、流变性及剪切力相互耦合的再启动数学模型。该模型考虑含蜡原油的压缩性、屈服应力及沿管道位置和时间变化的流变性影响。停输后原油的流变性方程采用宾汉模型,并考虑屈服应力的逐时变化。模型分析中考虑了层流和紊流的变化,通过数值模拟给出计算结果,此模型更接近于含蜡原油再启动的真实情况。

The propagating, crude pied model is stu culation of restart of waxy crude oil make for safety restart and yield progress,viscidity vary,clearing the oil plug from the pipe restart design. Pressure are developed. The coucontinuity equation,motion equation and theology equation. The restart model takes into account the compressibility and longitudinal variations. The theology of the gelled oil is modeled based on Bingham model,yield stress varies with time. Both laminar and turbulent flows are considered in the model Result is calculated by numerical procedure,the present model gives a more realistic prediction.