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Nonlinear self-induced vibration and operability envelope analysis of production strings in marine natural gas development

  • Liu, Kang (Centre for Offshore Engineering and Safety Technology, China University of Petroleum (East China)) ;
  • Chen, Guoming (Centre for Offshore Engineering and Safety Technology, China University of Petroleum (East China)) ;
  • Zhu, Gaogeng (Centre for Offshore Engineering and Safety Technology, China University of Petroleum (East China)) ;
  • Zhu, Jingyu (Centre for Offshore Engineering and Safety Technology, China University of Petroleum (East China))
  • Received : 2018.01.16
  • Accepted : 2018.07.09
  • Published : 2019.01.31

Abstract

Marine production strings are continuously affected by unstable internal fluid during operation. In this paper, the structural governing equation for marine production string self-induced vibration is constructed. A finite element analysis model is established based on Euler-Bernoulli theory and solved by the Newmark method. Furthermore, based on reliability theory, a self-design procedure is developed to determine the operability envelope for marine production string self-induced vibration. Case studies show: the response frequency of the production strings is consistent with the excitation frequency under harmonic fluctuation and mainly determined by the first-order natural frequency under stochastic fluctuation. The operability envelope for marine production string self-induced vibration is a near symmetrical trapezium. With the increasing of natural gas output, the permissible fluctuation coefficient dramatically decreases. A reasonable centralizer spacing, increasing top tension, and controlling natural gas output are of great significance to the risk control in marine production string operation.

Keywords

References

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