Ocean Engineering Equipment and Technology ›› 2015, Vol. 2 ›› Issue (2): 111-117.

• Orginal Article • Previous Articles     Next Articles

Global Response Analysis for the Deep-Sea Umbilical

Xi-qia CHEN1, Lei-jian SONG2, Xia-ying DU1, Jun WAN1, Shi-xiao FU2   

  1. 1. Bohai Oilfield Research Institute, Tianjin Branch, CNOOC China Limited, Tianjin 300452, China
    2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2015-01-22 Online:2015-04-10 Published:2016-03-30


We present the global analysis for the deep-sea umbilical. The design and analysis of the umbilical has become the research focus in the offshore engineering field. Global response analysis is the key issue in the research of umbilical. We present the theoretical models of the free hanging catenary shape and the lazy-wave shape at first. Based on the theoretical models, the umbilical models of the free hanging catenary shape and lazy-wave shape are then developed in OrcaFlex. The distribution characteristics of effective tension and bending curvature are calculated and compared. The results show that the shape of the lazy-wave is more complex than that of the free hanging catenary. However, the lazy-wave shape can reduce the effective tension at the top hanging points and dynamic response at the touchdown point, which makes it more applicable in the deep sea. Meanwhile, the sensitivity analysis of the generalized configuration parameters, including the length of the buoyancy catenary, the buoyancy factor and the starting location of the buoyancy catenary, is performed and the effect of the configuration parameters on the static characteristics of the umbilical is studied. The research results may provide a reference for the configuration design of the deep-sea umbilical.

Key words: deep-sea umbilical, global response, free hanging catenary, lazy-wave shape, effective tension, bending curvature

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