Dynamic catastrophe analysis of deepwater mooring platform/riser/wellhead coupled system under ISW

Na Qiu, Xiuquan Liu*, Yanwei Li, Pengji Hu, Yuanjiang Chang, Guoming Chen, Huixing Meng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Mooring platform/riser/wellhead coupled system, as an important and large complex system during offshore drilling operations, is easily affected by internal solitary waves (ISW). The impact load of ISW may lead to failure cascade process and even serious accident consequences to the coupled system. This paper is aimed at proposing a dynamic catastrophic analysis model that combines mechanical quantitative analysis with process safety of mooring platform/riser/wellhead system under ISW. The proposed dynamic catastrophic model can consider limit state of each system used as the failure criterion, including the dragging/fracture of mooring system and the fracture failure of riser/wellhead/conductor system. A dynamic catastrophic analysis method was proposed and a simulation program was also developed based on MATLAB. A case study was presented to reveal the dynamic catastrophic evolution process and the susceptibility of coupled system to ISW. Results indicated that the coupled system would experience wellhead fracture, mooring line dragging or fracture, riser fracture, and flex joint failure under different ISW velocities. Through the quantitative analysis with different ISW strength, two catastrophic scenarios, namely, wellhead fracture-mooring line dragging and mooring line dragging-wellhead fracture-mooring line dragging, occurred.

Original languageEnglish
Article number110084
JournalReliability Engineering and System Safety
Volume246
DOIs
Publication statusPublished - Jun 2024

Keywords

  • Catastrophe cascade effect
  • Drilling mooring platform/riser/wellhead system
  • Dynamic catastrophic model
  • Internal solitary wave

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