气塞破裂后油气混输管线压力变化规律

油气混输具有流型变化多、流动不稳定、流动规律复杂、易产生段塞的特点,造成管路运行不平稳、波动大、段塞冲击设备等问题,实际运行中工艺计算问题会变得十分复杂。通过建立段塞流气塞破裂力学模型,研究不同直径管线的气塞破裂可能引发的压力波动与冲击,对比分析气塞破裂后管线压力变化规律,研究结果表明:其他条件相同时,随着管径的减小,相同长度气塞破裂引发的气塞上游相同位置管线压力降低的幅度增大;随着气塞长度的增大和管道直径的减少,气塞破裂引发的压力波动向管道上游波及的距离不断增加。

Pressure Fluctuation of Oil-Gas Multiphase Flow Pipeline Caused by Rupture of Gas Plug

Oil and gas multiphase flow has characteristics of changeable flow patterns, unstable flows, complex flow laws and easy to produce slug, resulting in the mixed transportation pipeline unstable, and strong impact on equipments, etc. The process computational problem will become very complex in actual operations. In this paper, a slug flow airlock rupture mechanics model was established, and pressure fluctuation and impact caused by gas plug rupture in different diameter pipelines were researched, and the rule of pipeline pressure fluctuation caused by gas plug rupture was analyzed. The results showed that: when other conditions were same, with the decrease of the pipe diameter, the pressure drop of the upstream pipeline caused by the gas plug rupture with the same length increased;With the increase of the gas plug length and the decrease of the pipeline diameter, the distance of the pressure fluctuation spread to the upstream pipeline increased.