摘要
针对软悬挂紧急撤离工况下深水隔水管振动失效问题,采用有限元法并结合哈密顿变分和虚功原理,建立了软悬挂钻井隔水管三维非线性动力学模型,考虑了纵横向耦合效应、海洋涡激效应以及隔水管的大变形等非线性因素。借助文献试验参数和结果验证了非线性动力学模型的有效性。采用HYSY981钻井平台隔水管现场参数,探究了浮力块布置和台风重现期对紧急撤离工况下软悬挂隔水管非线性振动响应特性的影响规律。研究结果表明:合理布置浮力块可以减小应力和动态轴力,最优浮力块的布置方法可由所建立的理论模型确定;在高流速区中,隔水管的浮力块布置应该减少,且隔水管的最大应力和位移出现在靠近顶部或者底部区域,现场需重点关注此位置处隔水管的安全性;隔水管顺流向位移随着台风重现期的延长而增大,且靠近上端部分的位移变化较大,在撤离过程中应注意避免隔水管上端与月池碰撞。研究结果可为了解撤离工况下软悬挂隔水管振动响应特性提供参考。
Aiming at the problem of vibration failure of deepwater riser under the condition of soft suspension emergency evacuation, combined with the Hamiltonian variational and virtual work principle, the finite element method was used to build a 3 D nonlinear dynamic model of soft suspension drilling riser;meanwhile, the nonlinear factors such as longitudinal and transverse coupling effect, ocean vortex-excited effect and large deformation of riser were considered. With the help of test parameters and results presented in the literatures, the effectiveness of the nonlinear dynamic model was verified. The field parameters of riser in HYSY981 drilling platform were used to explore the influence of buoyancy modules layout and typhoon return period on the nonlinear vibration response characteristics of soft suspension riser under emergency evacuation conditions. The research results show that the reasonable arrangement of buoyancy modules can reduce the stress and dynamic axial force, and the optimal arrangement method of buoyancy modules can be determined by the built theoretical model;in the high flow rate area, the buoyancy modules layout of the riser should be reduced, the maximum stress and displacement of the riser occur near the top or bottom area, and the safety of the riser at this position should be paid attention to;the currentwise displacement of the riser increases with the increase of the typhoon return period, and the displacement near the upper part changes greatly, so in the evacuation process, the collision between the upper part of the riser and the moon pool should be avoided. The research results provide reference for understanding the vibration response characteristics of soft suspension riser under evacuation conditions.
作者
柳军
王普柽
郭晓强
Liu Jun;Wang Pucheng;Guo Xiaoqiang(School of Mechanical Engineering,Southwest Petroleum University)
出处
《石油机械》
北大核心
2022年第1期54-65,共12页
China Petroleum Machinery
基金
国家自然科学基金面上项目“深水无隔水管钻井钻柱纵-横-扭耦合非线性振动特性研究”(51875489)。
关键词
软悬挂撤离
纵横向耦合
涡激振动
大变形
管柱力学
soft suspension evacuation
longitudinal and transverse coupling
vortex-excited vibration
large deformation
string mechanics
