多相流流动对管道腐蚀状况研究

Study on Corrosion of Pipeline by Multiphase Flow

油气开采过程中管道内壁腐蚀受到多相流流型间转变过程的影响。文章以某气田开发为研究背景,基于FLUENT-OLGA采用VOF模型和腐蚀模型模拟多相流流型的转变过程和不同流型对管道腐蚀速率的影响。研究结果表明:持液率的变化对流型转变有本质影响;温度、压力对管道腐蚀影响很大,管道腐蚀程度因流型转变而加剧。段塞流对管道腐蚀破坏影响最大,腐蚀速率约0.21 mm/a;其次为环状流,平均腐蚀速率约0.18 mm/a;此外,管道遭受腐蚀破坏的原因与液相流速和壁面剪切力有密切的关联。

The flow pattern variation in multiphase flow has significant effect on corrosion of pipelines during oil-gas production.This article takes the Jinzhou Gas Field as research background to analyses the effect on corrosion rate with different flow pattern based on FLUENT-OLGA with VOF pattern and corrosion pattern;The results indicate that:The main reason causing flow pattern is liquid holdup;temperature and pressure have significant effect on carrion but the flow pattern variation can exacerbate corrosion rate;slug flow has the biggest influence on tubing corrosion,the annual average corrosion rate of up to 0.21 mm,followed by annular flow,and the annual average corrosion rate is 0.18 mm.In addition,the corrosion degree of the tubing is also related to the liquid velocity and the wall shear stress.