超深水钻井隔水管-井口系统涡激振动疲劳分析

doi:10.7623/syxb201106019

石油学报 ›› 2011, Vol. 32 ›› Issue (6): 1050-1054.DOI: 10.7623/syxb201106019

超深水钻井隔水管-井口系统涡激振动疲劳分析

孙友义 1,2 鞠少栋 1 蒋世全 2 陈国明 1

1中国石油大学海洋油气装备与安全技术研究中心山东东营 257061； 2中海油研究总院北京 100027

收稿日期:2011-04-11 修回日期:2011-08-23 出版日期:2011-11-25 发布日期:2012-01-17
通讯作者: 孙友义
作者简介:孙友义，男，1983年2月生，2009年获中国石油大学(华东)博士学位，现为中海油研究总院博士后研究员，主要从事海洋工程研究与设计工作。
基金资助:
国家科技重大专项(2008ZX05026-001-07)、国家自然科学基金项目(No.50904078)和中国石油大学优秀博士学位论文培育资助项目(Z10-08)联合资助。

Fatigue analysis of the vortex-induced vibration in a drilling riser-wellhead system in ultra deepwater

SUN Youyi 1,2 JÜ Shaodong 1 JIANG Shiquan 2 CHEN Guoming 1

Received:2011-04-11 Revised:2011-08-23 Online:2011-11-25 Published:2012-01-17

摘要/Abstract

摘要：

超深水钻井作业经常发生隔水管涡激疲劳问题，而由隔水管涡激振动(VIV)引起的井口系统疲劳可能更为严重。根据超深水隔水管-井口系统VIV疲劳分析算法与计算流程，建立隔水管-井口系统整体有限元模型，通过模态分析提取各阶模态下所有节点的振型、斜率和曲率，应用SHEAR7程序进行详细疲劳分析，识别系统关键疲劳部位，评估系统的VIV疲劳寿命，并研究顶张力、防喷器(BOP)、导管结构尺寸及井口出泥高度对井口系统VIV疲劳特性的影响规律。针对南海某超深水井的隔水管-井口系统进行实例分析，结果表明,超深水隔水管井口系统容易发生多阶模态振动，系统最大疲劳损伤位于导管上，系统疲劳寿命满足作业要求，适当提高顶张力、采用小型化的BOP、增大导管抗弯刚度以及降低井口出泥高度均可有效改善井口系统的VIV疲劳性能。

关键词: 超深水, 钻井隔水管, 井口, 导管, 涡激振动, 疲劳分析, 有限元分析

Abstract:

The fatigue induced by vortex in a riser occurs frequently during ultra deepwater drilling operations, while the wellhead system fatigue caused by vortex-induced vibration (VIV) in a riser may be more severe. The present paper established an integral finite element model for the riser-wellhead system by using the VIV fatigue analysis algorithm and calculation flow chart of the ultra deepwater riser-wellhead system. A modal analysis was performed to extract the vibrating mode, slope and curvature of all nodes in multi-stage modality. A detailed VIV fatigue analysis was carried out by applying SHEAR7 to identify key fatigue places of the riser-wellhead system, assess the VIV fatigue life of the system, and investigate impacts of the top tension, blowout preventer (BOP), conductor dimension and wellhead mud-line height on the VIV fatigue performance of the wellhead system. A practical analysis on the riser-wellhead system of an ultra deepwater well in the South China Sea indicated that multi-stage modal vibration occurred more readily in the ultra deepwater riser-wellhead system, the maximum fatigue damage was located on the conductor, and the fatigue life of the system could meet operation requirements. An appropriate increase of top tension, a small BOP, a conductor with large bending rigidity, and a reduction of the wellhead mud-line height would effectively improve the VIV fatigue performance of the wellhead system.

Key words: ultra deepwater, drilling riser, wellhead, conductor, vortex-induced vibration, fatigue analysis, finite element analysis

孙友义鞠少栋蒋世全陈国明. 超深水钻井隔水管-井口系统涡激振动疲劳分析[J]. 石油学报, 2011, 32(6): 1050-1054.

SUN Youyi Jü Shaodong JIANG Shiquan CHEN Guoming. Fatigue analysis of the vortex-induced vibration in a drilling riser-wellhead system in ultra deepwater[J]. Editorial office of ACTA PETROLEI SINICA, 2011, 32(6): 1050-1054.

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超深水钻井隔水管-井口系统涡激振动疲劳分析

Fatigue analysis of the vortex-induced vibration in a drilling riser-wellhead system in ultra deepwater

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