Nonlinear dynamic analysis and fatigue damage assessment for a deepwater test string subjected to random loads

作     者：Kang Liu Guo-Ming Chen Yuan-Jiang Chang Ben-Rui Zhu Xiu-Quan Liu Bin-Bin Han 

作者机构：Centre for Offshore Engineering and Safety TechnologyChina University of Petroleum 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2016年第13卷第1期

页      面：126-134页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 082002[工学-油气田开发工程] 

基　　金：supported by the National Key Basic Research Program of China (973 Program,Grant No.2015CB251203) the Fundamental Research Funds for the Central Universities (14CX06119A) 

主　　题：string fatigue joints performing applying operations durability retrieval sections favorable 

摘      要：The deepwater test string is an important but vulnerable component in offshore petroleum exploration,and its durability significantly affects the success of deepwater test *** the influence of random waves and the interaction between the test string and the riser,a time-domain nonlinear dynamic model of a deepwater test string is *** stress-time history of the test string is obtained to study vibration mechanisms and fatigue development in the test *** recommendations for reducing damage are *** results indicate that the amplitude of dynamic response when the string is subjected to random loads gradually decreases along the test string,and that the von Mises stress is higher in the string sections near the top of the test string and the flex *** addition,the fatigue damage fluctuates with the water depth,and the maximum damage occurs in string sections adjacent to the lower flex joint and in the splash *** measures are proposed to improve the operational safety of deepwater test strings：applying greater top tension,operating in a favorable marine environment,managing the order of the test string joints,and performing nondestructive testing of components at vulnerable positions.