深水钻井隔水管-导管系统波激疲劳分析

doi:10.7623/syxb201305020

石油学报 ›› 2013, Vol. 34 ›› Issue (5): 977-982.DOI: 10.7623/syxb201305020

深水钻井隔水管-导管系统波激疲劳分析

刘秀全¹, 陈国明¹, 畅元江¹, 许亮斌²

1. 中国石油大学海洋油气装备与安全技术研究中心山东青岛 266580;
2. 中海油研究总院北京 100027

收稿日期:2013-02-11 修回日期:2013-04-07 出版日期:2013-09-25 发布日期:2013-08-01
通讯作者: 陈国明,男,1962年10月生,1982年毕业于华东石油学院,现为中国石油大学(华东)教授、博士生导师,主要从事海洋油气工程及装备、油气安全工程方面的研究。Email:offshore@126.com
作者简介:刘秀全,男,1987年2月生,2009年毕业于中国石油大学(华东),现为中国石油大学(华东)博士研究生,主要从事深水钻井隔水管完整性技术研究。Email:lxqmcae@163.com
基金资助:
国家重大科技专项(2011ZX05026-001-05);长江学者和创新团队发展计划(IRT1086)和中央高校基本科研业务费专项资金项目(12CX06065A,11CX05009A)资助。

Wave induced fatigue analysis on deepwater drilling riser-conductor system

LIU Xiuquan¹, CHEN Guoming¹, CHANG Yuanjiang¹, XU Liangbin²

1. Centre for Offshore Engineering and Safety Technology, China University of Petroleum, Qingdao 266580, China;
2. CNOOC Research Institute, Beijing 100027, China

Received:2013-02-11 Revised:2013-04-07 Online:2013-09-25 Published:2013-08-01

摘要/Abstract

摘要：

波激疲劳是深水钻井隔水管-导管系统最主要的失效模式之一。综合考虑波浪载荷、钻井平台运动和土壤抗力建立了深水钻井隔水管-导管耦合系统波激疲劳分析方法,实例分析了中国南海某井深水钻井隔水管-导管系统波激疲劳寿命,识别出了系统波激疲劳关键部位,并与隔水管常规分析模型的计算结果进行了对比。在此基础上,研究了钻井平台运动幅值、顶张力、下挠性接头转动刚度和井口出泥高度对系统波激疲劳特性的影响。结果表明,常规分析模型将隔水管底部看作固定端导致隔水管波激疲劳损伤过大,而本文提出的隔水管-导管系统分析模型能较好地模拟隔水管实际受力情况;隔水管最大波激疲劳损伤出现在下挠性接头处,导管的最大波激疲劳损伤出现在泥线附近;导管是整个系统中波激疲劳性能最薄弱的环节,适当地减小钻井平台运动幅值、隔水管顶张力、下挠性接头转动刚度和井口出泥高度均能改善导管波激疲劳性能。

关键词: 深水, 钻井隔水管, 导管, 动态分析, 波激疲劳

Abstract:

Wave induced fatigue is one of the main failure modes of a deepwater drilling riser-conductor system. In the present paper, a method for calculating wave induced fatigue of the deepwater drilling riser-conductor system was established by comprehensively taking wave load, drilling platform motion and soil resistance into consideration. Wave induced fatigue of the riser-conductor system from a well in the South China Sea was analyzed and key fatigue points of the riser-conductor system were identified, finally the computation result was compared with that calculated by the conventional riser analysis model. On the basis of these results, influences of drilling platform motion amplitude, top tension, rotational stiffness of the lower flex joint and the wellhead mud-line height on the system fatigue were examined. The results showed that the conventional analysis model takes the bottom of a riser as a fixed end, resulting in a too big wave induced fatigue damage of the riser. The riser-conductor analysis model proposed in this paper can simulate the actual load condition of a riser better. The maximum wave induced fatigue damage of a riser lies at the lower flex joint, while that of a conductor occurs around mud-line. The conductor is the weakest point of the wave induced fatigue performance in the whole system. An appropriate decrease in drilling platform motion amplitude, top tension of a riser, rotational stiffness of the lower flex joint and the wellhead mud-line height can all improve the wave induced fatigue performance of a conductor.

Key words: deepwater, drilling riser, conductor, dynamic analysis, wave induced fatigue

中图分类号:

TE52

刘秀全, 陈国明, 畅元江, 许亮斌. 深水钻井隔水管-导管系统波激疲劳分析[J]. 石油学报, 2013, 34(5): 977-982.

LIU Xiuquan, CHEN Guoming, CHANG Yuanjiang, XU Liangbin. Wave induced fatigue analysis on deepwater drilling riser-conductor system[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(5): 977-982.

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深水钻井隔水管-导管系统波激疲劳分析

Wave induced fatigue analysis on deepwater drilling riser-conductor system

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