The purpose of this study is to obtain the heat transfer and flow law of waxy crude oil in the inclined pipeline and to provide theoretical guidance for the safe operation of the pipeline. In this paper, three-dimensional numerical simulation of pipes with inclination angles of 0°, 25 °and 45 °is carried out by using CFD software. The temperature and velocity fields of waxy crude oil and the cooling gelation law of crude oil are basically the same in different cases. Affected by the initial temperature field of shutdown, the average temperature of horizontal pipeline decreases gradually along the flow direction of pipeline. The inclined pipe is mainly affected by the natural convection caused by gravity, and the temperature decreases gradually along the downward direction of the inclination of the pipe. The inclination angle of the pipe increases to 45°, the temperature difference between the highest and lowest points of the pipe increases to 5.012 °C, and the liquid volume fraction increases by 1.6%. Among them, the low-lying pipe section is more likely to cause pipeline blockage.

本研究旨在获取含蜡原油在倾斜管道中的传热和流动规律，为管道的安全运行提供理论指导。本文利用CFD软件对0°、25°和45°倾角管道进行三维数值模拟。不同情况下含蜡原油的温度场和速度场以及原油的冷却凝胶化规律基本相同。受停机初始温度场的影响，水平管道平均温度沿管道流向逐渐降低。倾斜的管道主要受重力引起的自然对流的影响，温度沿着管道倾斜向下的方向逐渐降低。管道倾角增加到45°，管道最高点和最低点的温差增加到5.012℃，液体体积分数增加1.6%。其中，低洼管段更容易造成管道堵塞。