基于CFD的输油管道腐蚀特性分析  

Analysis of Oil Pipeline Corrosion Characteristics based on CFD

作　　者：李明[1] 蔡亮 李杉 李小刚 张世强 梁昌晶 LI Ming;CAI Liang;LI Shan;LI Xiaogang;ZHANG Shiqiang;LIANG Changjing(CNPC No.5 Oil Production Plant of Huabei Oilfield Company,Xinji 052360,Hebei,China;CNAF Beijing-Tianjin-Hebei Logistics Trarsportion Co.,Ltd.,Tianjin 300300,China;CNPC Bohai Equipment Julong Steel Pipe Co.,Ltd.,Qingxian 062658,Hebei,China;CNPC Downhole Services Company of Bohai Drilling Engineering Co.,Ltd.,Renqiu 062552,Hebei,China)

机构地区：[1]中国石油华北油田分公司第五采油厂,河北辛集052360 [2]中航油京津冀物流有限公司,天津300300 [3]中国石油渤海装备巨龙钢管公司,河北青县062650 [4]中国石油渤海钻探工程有限公司井下作业分公司,河北任丘062552

出　　处：《焊管》2023年第9期53-58,共6页Welded Pipe and Tube

摘　　要：针对目前输油管道内腐蚀严重的现象,通过计算流体力学(CFD)方法,基于VOF欧拉模型和k-w湍流模型,对油水两相体系下不同含水率、不同流速的管道积液情况进行了分析,并考察了原油密度、压力、温度等因素对临界流速的影响,确定了输油管道发生腐蚀的先决条件。结果表明,对于低含水原油,流速越大,原油对水的离散作用越强,腐蚀危险性越弱;对于高含水原油,无论流速大小,管壁处均会形成连续水膜,腐蚀危险性增大;流速增加会减小管底积液厚度,当管底几乎无连续含水率离散点时可确定临界流速;原油密度越大,压力越低,临界流速就越小,而温度与临界流速无关联。研究结果可为输油管道的安全运行及维护提供参考。Aiming at the phenomenon of severe corrosion in oil pipeline,through computational fluid dynamics(CFD)method,based on the VOF Euler model and k-w turbulence model,the oil water two phase system under different moisture content and flow velocity of fluid from the pipeline was analyzed,and the influence of the density of crude oil,pressure,temperature and other factors on the critical flow rate were investigated,and the prerequisite for corrosion to occur in the pipeline was determined.The results show that for low water cut crude oil,the higher the flow rate,the stronger the dispersion effect of crude oil on water,and the weaker the corrosion risk;for high water cut crude oil,no matter the flow rate,continuous water film will be formed at the pipe wall,and the corrosion risk is greater.With the increase of flow rate,the thickness of fluid at the bottom of the pipe is reduced.The critical flow rate can be determined when few scatter points can be found at the bottom of the pipe.The higher density of crude oil and the lower the pressure,the lower the critical flow rate,but there is no correlation between temperature and critical flow rate.The results can provide practical reference for the safe operation of oil pipelines.

关 键 词：输油管道 腐蚀 含水率 计算流体力学 临界流速 

分 类 号：TG179[金属学及工艺—金属表面处理]