悬链型管道严重段塞流数值模拟研究

Numerical Simulation of Severe Slug Flow in a Catenary-Shaped Pipe System

严重段塞流不仅会造成下游分流器溢流或者断流现象，降低油气井产量，而且会缩短管道、管道接头和作业平台的寿命。采用ANSYS—Fluent软件建立了严重段塞流数值计算模型，并通过该软件对全场的关键参数进行实时监控，采用软件中的VOF方法计算了气液相间界面相互作用。建立模型时出口采用压力出口，壁面采用标准壁面函数，气液两相界面构造选用几何重构方法。分析结果表明，严重段塞流立管底部压力波动较强烈，在很短的时间内从50kP。降到了35kPa，严重段塞流的周期约为364s；严重段塞流管道出口平均流速在0．533，0．225m／s之间蛮化，出口质量流量在10．890～0．006kg／s之间变化.

Severe slug flow could not only cause flooding or cutout in downstream diverter which could result in a reduction in well production, but also shorten the life of pipes, pipe joints and platforms. A numerical model of severe slug flow in a catenary-shaped pipe system is established by using ANSYS-Fluent software, and real-time monitoring of the key parameters of the entire flow is conducted through the established model. The interface interaction of gas and liquid is calculated by the VOF method in ANSYS-Fluent software. In the model, the pressure outlet for the pipe outlet, the standard wall function for the pipe wall and the geometry reconstruction method for the gas- liquid phase interface structure are adopted. The results show that the bottom pressure of the standpipe fluctuates intensely during the severe slug flow with a drop from 50 kPa to 35 kPa in a very short period of time. Severe slug flow cycle is about 364 s. At the pipe outlet, the average velocity varies between 0. 533 -0. 225 m/s and the mass flow rate varies between 10. 890 - 0. 006 kg/s.