A New Simulation Model for Recoil Analysis of Deep-Water Drilling Risers After Emergency Disconnection  

作　　者：WU Jun-kang MENG Shuai 

机构地区：[1]State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《China Ocean Engineering》2023年第4期637-644,共8页中国海洋工程（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51879161).

摘　　要：The recoil response of a deep-water drilling riser following an ED(Emergency Disconnection)scenario is a transient and sensitive process.The recoiling displacement of the riser is the resultant of recoil motion and axial stretch.How-ever,it is typically represented by one variable in recoil simulations.As axial deformation is quite small compared with axial motion in the recoil process,it inevitably introduces numerical errors(i.e.,a large number annihilating a small number).Thus,it is hard to perform a quantitative analysis of axial deformation,although a consensus initial deformation is essential for recoil dynamics.Moreover,the triggered axial natural modes have never been examined before.In this study,the recoil response is decomposed into two parts:recoil motion and axial deformation,and a novel model is developed by Galerkin method.It has demonstrated that the initial stretch has a significant effect at the initial stage in recoil.The existing models underestimate the effects of axial deformation.The new model can capture information of triggered natural modes and figure out the modes undergoing dynamic compression.This study can be beneficial to overpull setting,determination of ED time and anti-recoil control optimization.

关 键 词：recoil analysis drilling riser emergency disconnection axial deformation Galerkin method 

分 类 号：U674.381[交通运输工程—船舶及航道工程] P75[交通运输工程—船舶与海洋工程]