气液物性参数对严重段塞流特性影响研究(英文)

Characteristics of the Severe Slugging under Different Gas-Liquid Physical Parameters

针对海底油气传输常见的下倾管—立管系统严重段塞流问题,采用严重段塞流形成条件一致的等效原则,发展了一种将三维流动转化为二维的数值模拟方法,仿真结果与相关的以水和空气为流动介质的实验结果吻合较好。在此基础上,利用该方法研究气液物性参数对严重段塞流的影响,分别选取水、原油和煤油为液体介质,甲烷和空气为气体介质,对管道内出现的严重段塞流进行数值模拟。研究发现,液体粘性、密度和表面张力对严重段塞流的流动过程、周期、压力波动、含气率和液塞速度均有显著影响,而气体物性变化对严重段塞流的影响较小。文中研究有助于深入揭示物性参数对严重段塞流的作用,同时也为评估不同海底油气田的严重段塞流危害提供了理论支持。

A CFD method is proposed to simulate the gas-liquid severe slugging in a declined pipelineriser system. Based on the consistence principle of the severe slugging formation condition, the problem for the 3D flow is simplified into one of a 2D flow. The numerical results obtained by the proposed method are in good agreement with experimental results using water and air as fluid medium. By means of the method, the influence of gas-liquid physical parameters on the severe slugging is studied and analyzed when the liquids are water, crude oil and kerosene, the gas is methane and air respectively. Results show that the physical parameters of the liquid, including viscosity, density and surface tension, have remarkable influence on the characteristics of the severe slugging, including the flow pattern, the period, the pressure fluctuation, the void fraction as well as slug velocity. The influence of the gas physical parameters on the severe slugging is not significant. The research can help to reveal the effect of physical parameters on severe slugging, and to provide theoretical support for evaluation of the damage level of severe slugging in different subsea oil fields with distinct oil-gas physical properties.