摘要
隔水管系统作为连接海底井口与钻井平台的关键结构,在强洋流与显著潮差的海洋环境中面临严峻的安全与稳定性挑战,频发的结构变形与疲劳破坏问题亟需通过精细建模与参数优化加以应对。文章围绕深水钻井作业中隔水管在非线性海洋环境载荷作用下的动力学响应行为开展研究:基于改进的Morison方程构建波浪—潮流耦合的非线性载荷模型,采用最小势能原理与变分方法推导结构控制方程,通过Hermite插值与Galerkin法实现有限元离散,并结合Newmark方法进行动态响应求解。研究发现:隔水管在水深约102 m处易形成“位移峰值+零转角”的高曲率响应区,属于结构潜在失效段。针对该薄弱区域,提出壁厚梯度优化设计策略,可有效降低最大位移、抑制角度波动并缩短响应周期,从而提升隔水管对中高频载荷的抵抗能力。进一步分析发现,顶张力是最直接高效的控制参数;在强潮流工况下,通过提高顶张力并结合壁厚增强形成协同抑制策略,可显著恢复结构安全裕度,满足大潮差(>1.5 m)等极端工况下的稳定运行需求。研究成果可为深水隔水管系统的设计优化与作业风险控制提供理论支撑与工程参考。
As a critical structural link between subsea wellheads and offshore drilling platforms,the riser system faces severe challenges to its safety and stability under strong ocean currents and large tidal variations.Frequent structural deformation and fatigue failures urgently call for refined modeling and parameter optimization solutions.This study investigates the dynamic response behavior of deepwater drilling risers subjected to nonlinear ocean environmental loads.A nonlinear load model for wave-current coupling is established based on the improved Morison equation.The structural governing equations are derived using the principle of minimum potential energy and variational functional methods.Finite element discretization is achieved through Hermite interpolation and the Galerkin method,and the dynamic response of the riser is solved using the Newmark time integration scheme.The results reveal that a high-curvature zone characterized by"peak displacement and near-zero rotation"is likely to form at a depth of approximately 102 meters,representing a potential failure-prone segment.To address this,a gradient wall thickness optimization strategy is proposed,which effectively reduces maximum displacement,suppresses angular fluctuations,and significantly shortens the response period,thereby enhancing resistance to mid to-high-frequency loads.Further analysis confirms that top tension serves as the most direct and effective control parameter.Under intensified current conditions,a coordinated suppression strategy-combining increased top tension and enhanced wall thickness-can restore structural safety margins and ensure operational stability under extreme tidal variations(tidal range>1.5 m).The research outcomes provide valuable insights for the structural optimization and risk mitigation of riser systems in deepwater drilling operations.
作者
邢云龙
张博
徐化奎
张晶
王可鑫
XING Yunlong;ZHANG Bo;XU Huakui;ZHANG Jing;WANG Kexin(China Oilfield Services Limited,Tianjin 300450,China;Hainan Branch of CNOOC(China)Co.,Ltd.,Haikou,Hainan 570312,China;Sinopec Southwest Petroleum Engineering Co.,Ltd.,Underground Operations Branch,Deyang,Sichuan 618030,China;School of Mechanical and Electrical Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,China)
出处
《钻采工艺》
北大核心
2025年第4期48-56,共9页
Drilling & Production Technology
关键词
隔水管
动力学响应行为
非线性载荷
壁厚梯度优化设计
顶张力
协同抑制策略
riser
dynamic response behavior
nonlinear loading
wall thickness gradient optimization
top ten⁃sion
coordinated suppression strategy
