Fracture failure analysis of an offshore drilling centralizer
Author:
Li Zhenkun1, Li Ning1, Yan Xinye2, He Yang1, Yang Yang3, Xu Xinjing4, Yin Qishuai5, Liu Xiaofeng1, Hao Yuzheng1, Ji Jinfeng4
Affiliation:
1. CNOOC Ener Tech-Drilling & Production Co. , Tianjin , China 2. China University of Petroleum Beijing , Changping-qu , Beijing , China 3. CNOOC (Tianjin) Pipeline Engineering Technology Co., Ltd , Tianjin , China 4. Hainan Longpan Oilfield Technology Co. LTD , Hainan , China 5. Department of Safety Engineering , China University of Petroleum Beijing , 18, Fuxue Road, Changping District , 102249 Changping-qu , China
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.
Funder
National Key Research and Development Program China Postdoctoral Science Foundation Science Foundation of China University of Petroleum, Beijing CNOOC(Tianjin)Pipeline Engineering Technology Co., Ltd CNOOC Ener Tech-Drilling & Production Co National Natural Science Foundation of China Hainan Province Science and Technology Special Fund
Publisher
Walter de Gruyter GmbH
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
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