严重段塞流顶部节流作用下的流型及其转变  

Flow Patterns and Transitions during Riser Topside Choking on the Elimination of Severe Slugging

作　　者：李乃良[1] 李文升[1] 郭烈锦[1] 李清平 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049 [2]中海油研究总院,北京100027

出　　处：《工程热物理学报》2015年第1期97-100,共4页Journal of Engineering Thermophysics

基　　金：中海油国家科技重大专项(No.2011ZX05026-004-02);国家自然科学基金委创新群体基金项目(No.50821064);优秀重点实验室奖励基金项目(No.50823002)

摘　　要：严重段塞流是常见于海洋石油工业集输-立管系统中的一种有害流型,而立管顶部阀门节流是抑制和消除严重段塞流的有效方法。本文实验研究了对严重段塞流采取节流操作所引起的流型及其转变特性,结果表明,随着阀门开度的减小,节流阀压降增大,背压升高,很大程度上抵消了下倾管内封闭气体的压力,从而抑制了下倾管内气体体积的膨胀,导致下倾管内的大量气体无法在短时间内快速连续地进入立管,而只能以大气泡或小气泡群的形式间歇进入立管,促进了弹状流和泡状流的形成。考虑了气液流速对节流阀压降的影响,建立了节流作用下S型立管内气液稳定流动边界,与实验数据吻合良好。Severe slugging is undesired in offshore pipeline-riser system and riser topside choking is an effective method for the elimination of severe slugging.Flow patterns and transitions induced by riser topside choking on severe slugging were studied experimentally.It is found that the pressure drop across the choke increases with the decrease of the valve opening.The pressure of the gas trapped in the pipeline is counteracted and therefore the expansion of the gas is suppressed.As a result,the gas penetrates into the riser in the form of individual bubbles,leading to the formation of slug flow and bubbly flow.The stability boundary accounting for the prediction of the behavior of gas-liquid flow in a pipeline-riser system in the process of riser topside choking is also proposed.The predictions are tested against experimental results,showing a reasonable agreement.

关 键 词：节流 严重段塞流 流型 流型转变 

分 类 号：O359[理学—流体力学]