SIF evaluation and stress analysis of drillstring threaded joints |
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| Affiliation: | 1. School of Mines, Guizhou University of Engineering Science, Bijie 551700, China;2. Guizhou Panjiang Coal and Electricity Group Co., LTD, Guiyang 550000, China;3. School of Mines, China University of Mining and Technology, Xuzhou 221116, China;4. State Key Laboratory of Coal Resources and Safe Mining, Xuzhou 221008, China;1. Department of Surgery, Seoul St. Mary''s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea;2. Catholic Central Laboratory of Surgery, Institute of Biomedical Industry, College of Medicine, the Catholic University of Korea, Seoul, Republic of Korea;3. Department of Surgery, Uijeongbu St. Mary''s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Geotechnical Engineering Institute of Tianjin University, Tianjin 300072, China;2. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Geotechnical Engineering Institute of Tianjin University, Tianjin300072, China |
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| Abstract: | In a study by Tafreshi and Dover 1], 2], 3] stress analysis of drillstring threaded joints under axial, bending and torsion loadings was carried out using the finite element method. Stress concentrations were determined on a variety of threaded joints in order to predict the fatigue life of these components. Here some of those results are presented in more detail. In this study it is shown that in the case of bending, axisymmetric solid elements with non-linear, asymmetric deformation with fourier interpolation can be employed which reduces the computational time and modelling in comparison with the full three-dimensional analysis. Quasi semi-elliptic circumferential internal and external cracks in tubes with the same dimensions of the pins or boxes of a series of joints are modelled and analysed using the J-integral method. The result of this fully three-dimensional crack analysis shows the same trend as experimental 3] and published results 4]. |
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