Fracture failure analysis of an offshore drilling centralizer

IF 2.4 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Testing Pub Date : 2023-09-20 DOI:10.1515/mt-2023-0012

Zhenkun Li, Ning Li, Xinye Yan, Yang He, Yang Yang, Xinjing Xu, Qishuai Yin, Xiaofeng Liu, Yuzheng Hao, Jinfeng Ji

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Abstract

Abstract As an important device to control the drilling direction in the drilling process, centralizer plays an important role in slowing the deviation and improving the casing centering degree. This paper makes a detailed analysis on the fracture failure of centralizer after multiple repair welding. First, the macroscopic appearance of the port is observed by macroscopic inspection. Secondly, the physical and chemical performance analysis shows that all indicators meet the requirements of the indicators. Finally, through the microscopic morphology, energy dispersive spectrometer (EDS) and other means to analyze the port crack source, combined with a variety of tests to find the true cause of fracture failure centralizer. After inspection, it was found that the centralizer was fatigue fracture, and showed multi-source cracking characteristics. Therefore, strict control of centralizer especially after repair welding quality, strengthen the quality inspection of centralizer, to carry out the relevant thermal processing technology research, and further effectively prevent the occurrence of fracture failure.

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海上钻井扶正器断裂失效分析

扶正器作为钻井过程中控制钻井方向的重要装置，在减缓井斜、提高套管对中度方面发挥着重要作用。对扶正器多次补焊后断裂失效进行了详细分析。首先，通过宏观检查观察港口的宏观外观。其次，理化性能分析表明，各项指标均符合指标要求。最后，通过微观形貌、能谱仪(EDS)等手段对端口裂纹源进行分析，结合多种试验，找出扶正器破裂失效的真正原因。经检查，扶正器为疲劳断裂，呈现多源开裂特征。因此，严格控制扶正器特别是修复后的焊接质量，加强扶正器的质量检验，开展相关的热加工技术研究，进一步有效防止断裂失效的发生。

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来源期刊

Materials Testing 工程技术-材料科学：表征与测试

CiteScore

4.20

自引率

36.00%

发文量

165

审稿时长

4-8 weeks

期刊介绍： Materials Testing is a SCI-listed English language journal dealing with all aspects of material and component testing with a special focus on transfer between laboratory research into industrial application. The journal provides first-hand information on non-destructive, destructive, optical, physical and chemical test procedures. It contains exclusive articles which are peer-reviewed applying respectively high international quality criterions.