Title

Mechanical Analysis of the Wave-Induced Fatigue in the Subsea Wellhead

作者

李中弓大为郭永宾陈浩东刘和兴赵学战

Authors

LI Zhong GONG Dawei GUO Yongbin CHEN Haodong LIU Hexing ZHAO Xuezhan

单位

中海石油(中国) 有限公司湛江分公司, 广东湛江 524057; 上海霞为石油设备技术服务有限公司, 上海 201414

Organization

CNOOC(China) Ltd. Zhanjiang Branch, Zhanjiang 524057, Guangdong, China; Shanghai SUPWEE Co., Ltd., Shanghai 201414, China

摘要

根据水下钻井作业的实际工况，建立了水下井口及隔水管力学模型和有限元三维模型，并进一步对系统进行力学分析及有限元计算。应用ABAQUS的AQUA模块对波浪及洋流载荷进行模拟，结合平台响应振幅算子RAO（ResponseAmplitude Operator）获取波浪载荷与井口疲劳热点之间的传递函数，再利用波浪散布图并结合S-N曲线计算水下井口的波致疲劳寿命。算例分析表明，水下井口设备的疲劳寿命符合DNVGL相关规范的要求。

Abstract

Based on the actual working conditions of subsea drilling jobs, the subsea wellhead and riser system, mechanical and finite element 3D model are established to further analyze the system. Then, the AQUA mode of the ABAQUS is used to simulate the wave and ocean current loads. And RAO of the platform is used to obtain the transfer function between the wave loads and the wellhead fatigue hot spots. Then the wave scatter map is combined with the S-N curve to calculate the wave-induced fatigue life in the subsea wellhead. The analysis of the example shows that the fatigue life of sub-sea wellhead can meet the requirements of the DNVGL specifications.

关键词：

水下井口; 波致疲劳; 力学分析; ABAQUS;

Keywords:

subsea wellhead; wave-induce fatigue; mechanical analysis; ABAQUS;

基金项目

“十三五”科技重大专项“南海深水钻完井关键技术研究”（CCL2017ZJFN2269）。

DOI

https://doi.org/10.3969/j.issn.1008-2336.2019.03.090

水下井口波致疲劳力学分析