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Severe slugging and unstable flows in an S-shaped riser

机译:S形立管中的严重击打和不稳定流动

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摘要

Severe slugging and unstable flow in an S-Shaped riser has been investigated in threeresearch themes - experiments, criterion modelling and transient code modelling.A series of experiments were carried out on the Cranfield University Three PhaseFacility and Riser Rig using a 10 m high riser over the pressure range 2,4 and 7bar(a). The collected information was used to characterise the unstable flows in termsof pressure cycling, riser liquid inventory and fluid production characteristics. Fromanalysis of the flow behaviour, it was found that in terms of slug characteristics,transitional severe slugging and oscillation flows are as potentially problematic as`classical' severe slugging. This is due to the magnitude of peak flow in excess of theaverage fluid throughput in the riser and the size of the liquid slugs generated.A criterion for the occurrence of unstable flows in an S-Shaped riser was developedbased upon considerations of bubble penetration at the riser base. This proved to besuccessful at predicting the experimental results from this work and an independentsource.Comparisons were made between the experimental results and a transient code. Thecode could predict the occurrence of `classical' severe slugging however the detailedcharacteristics of the experiments were not predicted by the code. The results fortransitional severe slugging and oscillation flow showed further differences betweenthe code prediction and the experiments. Drawing all simulation results together itwas concluded that the prediction of pipeline behaviour and the propagation of flowregimes local to the riser base and in the curved riser pipe were significant sources oferror in the simulation.
机译:在三个研究主题-实验,准则建模和瞬态代码建模中研究了S型立管中的严重塞击和不稳定流动。在Cranfield University三相设施和Riser钻机上使用10 m高的立管进行了一系列实验压力范围2,4和7bar(a)。所收集的信息用于根据压力循环,立管液体库存和流体生产特征来表征不稳定流量。通过对流动特性的分析,发现在段塞特征方面,过渡性严重段塞和振荡流与“经典”严重段塞一样潜在地存在问题。这是由于峰值流量超过立管中的平均流体流量的大小以及所产生的液团的大小所致。基于对S型立管中气泡渗透的考虑,制定了S型立管中不稳定流动发生准则。立管底座。事实证明,这可以成功地预测这项工作的结果,并且具有独立的来源。实验结果与瞬态代码进行了比较。该代码可以预测“经典”严重击打的发生,但是该代码无法预测实验的详细特征。过渡过程的严重拍击和振荡流的结果表明,代码预测与实验之间存在进一步的差异。综合所有模拟结果得出的结论是,对管道行为的预测以及立管底座和弯曲立管内局部流动形式的传播是模拟中的重要误差来源。

著录项

  • 作者

    Montgomery J. A.;

  • 作者单位
  • 年度 2002
  • 总页数
  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
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