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On the interaction between severe slug buildup and dynamic response of a submerged top-tensioned riser

机译：上沉式冒口的严重弹头堆积与动力响应之间的相互作用

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摘要

Severe slugging in deepwater flowlines and risers systems is one of the flow assurance problems that interrupts the steadily flow of reservoir fluids, most severely in offshore oilfields with undulated seabed terrain. This flow regime threatens the structural integrity of subsea production systems due to its fatigue loading behaviour which prompts the need to investigate its impact on the riser stability. A mathematical model which based on a modified Euler-Bernoulli beam theory and plug flow is presented to analyse the dynamic response of a riser during severe slug buildup. Solution for the transverse deflections of the riser in space and time was sought through finite difference approximations with implicit space and explicit time discretization scheme implemented in Matlab, with an adaptive algorithm that computes the changing hydrostatic pressure in the riser due to the severe slug buildup. The dynamic response of the riser was observed to be undergoing a damped vibration with decaying amplitude. Accuracy of the solution was verified with a coupled fluid-structure interaction simulation in Abaqus. Parametric studies on velocity variations and riser responses were conducted. The mathematical solution presented in this paper has opened a new idea for riser pipe analysis with respect to severe slug flow.
机译：在深水输水管线和立管系统中的严重塞击是中断油藏流体稳定流动的流量保证问题之一，其中最严重的是在海床地形起伏的海上油田。这种流动状态由于其疲劳载荷行为而威胁着海底生产系统的结构完整性，这提示需要研究其对立管稳定性的影响。提出了一种基于改进的Euler-Bernoulli束流理论和塞流的数学模型，以分析立管在严重弹头堆积过程中的动力响应。通过使用隐式空间的有限差分近似和Matlab中实现的显式时间离散化方案，通过自适应算法计算由于严重的弹头堆积而引起的立管中静水压力的变化，来寻求立管在空间和时间上的横向变形的解决方案。观察到立管的动态响应正在经历衰减的振幅衰减的振动。在Abaqus中通过耦合的流固耦合仿真验证了溶液的准确性。进行了关于速度变化和立管响应的参数研究。本文提出的数学解决方案为针对严重团状流的立管分析开辟了一个新思路。

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