) 1.中国石油大学(北京) 城市油气输配北京市重点实验室,北京 102249
2.美国加州大学圣地亚哥分校 机械与航空工程系,美国 圣地亚哥 92093-0411
3.中国石化销售有限公司华南分公司,广州 510000
4.清华大学 工程力学系,北京 100084
收稿日期:2020-01-16出版日期:2021-07-28发布日期:2021-07-30通讯作者:梁永图E-mail:liangyt21st@163.com作者简介:李岩松(1995-),男,陕西省榆林市人,博士生,研究方向为复杂流体流动与传热特性基金资助:国家自然科学基金资助项目(51874325)Numerical Simulation of Critical Oil Velocity Required to Completely Remove Water Lump Deposited in Hilly Oil Pipelines
LI Yansong1,4, DING Dingqian2, HAN Dong1, LIU Jing3, LIANG Yongtu1() 1. Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum-Beijing, Beijing 102249, China
2. Department of Mechanical and Aerospace Engineering, University of California, San Diego 92093-0411, USA
3. South China Branch of Sinopec Sales Co., Ltd., Guangzhou 510000, China
4. Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
Received:2020-01-16Online:2021-07-28Published:2021-07-30Contact:LIANG Yongtu E-mail:liangyt21st@163.com摘要/Abstract
摘要： 水力清管可有效减缓管输油品质量指标的衰减,研究水力清除成品油管内积水所需的临界完全携积水油速具有十分重要的现实意义.首先,分析了完全携水油速下管内油携水的流动型态,发现临界完全携积水油速下,上倾管内油携水流动属于油水两相波状分层流.基于此,建立了双极坐标系下的油携水流动数值模型,并给出了数值求解算法.最后,将模型计算值与文献数据进行对比分析,验证了临界完全携积水油速数值模型的可靠性.对上倾管道内柴油携水流动过程进行了数值研究,详细分析了水力清管过程中油流和积水的流动特性.研究结果表明:水膜在油流携带过程中主要受重力压降的影响,摩阻压降相比于重力压降可忽略;当管内油速较小时,靠近相界面处的水相部分在油相的携带作用下向下游流动,而管壁附近的水相在重力作用下回流至管道底部;随着油相速度增大,水相速度最小值位置逐渐向管壁偏移,当其首次出现在管壁位置时对应的管内油相速度即为临界完全携积水油速.
关键词: 输油管道, 油携水, 临界完全携积水油速, 两相流, 数值模拟
Abstract: Removing the trapped water lump from the pipelines by using the hydraulic pigging (HP) method can effectively reduce the attenuation of oil quality. It is of great practical significance to study the critical oil velocity required to completely remove the water lump trapped in hilly oil pipelines. First, the flow patterns of water expelled by oil stream in an upward inclined pipeline are analyzed when the oil velocity in pipelines reachs the critical value required to completely remove the water. It is found that the flow process of the water removed by oil stream belongs to oil-water two phase stratified wavy flow. Next, the numerical model governing the flow of water expelled by oil is established in the bipolar coordinate system based on the flow pattern aforementioned, and the numerical solution method is also proposed. Finally, the numerical model is validated through the comparison of the results calculated by the model with the data from the literature. The flow of water lump expelled by diesel in an upward inclined pipeline is numerically studied, and the characteristics of the oil flow and water lump mobilization during the HP process are analyzed in detail. The results show that the water lump is mainly influenced by gravity pressure drop. The friction pressure drop could be neglected compared to the gravity pressure drop. When the oil velocity in the pipe is small, the water phase near the interface is carried downstream by the oil stream, while that near the pipe wall flows back to the bottom of the pipeline due to gravity. The postion of the minimum velocity in the water phase will shift to the pipe wall with the oil velocity increasing. When the minimum water velocity appears at the pipe wall for the first time, the oil velocity in pipelines can be regarded as the critical oil velocity required to completely remove the water lump in the pipelines.
Key words: oil pipeline, water expelled by oil stream, critical oil velocity to completely remove water, two-phase flow, numerical simulation
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