Design optimization of OCTG premium connection system based on the effect of stabbing flank angle

• Published in: Journal of mechanical science and technology Vol. 35; no. 2; pp. 545 - 561
• Main Authors: Kim, Byeongil, Huang, Jie, Yoon, Jong-Yun
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society of Mechanical Engineers 01.02.2021; Springer Nature B.V; 대한기계학회
• Subjects: Control; Design criteria; Design optimization; Design parameters; Dynamical Systems; Engineering; Industrial and Production Engineering; Joints; Mechanical Engineering; Oil field equipment; Original Article; Tubular goods; Vibration; 기계공학; Threaded connection; Premium connection system; Contact stress analysis; Oil country tubular goods; Stabbing flank angle
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-021-0114-2

This paper proposes a new premium connection system for oil country tubular goods with good durability under severe conditions. As premium connections are mainly stressed at the joints, proper design of threads is very important, and optimized parameter values are directly linked to the robustness of premium connections. Hence, we analyzed von Mises stress changes in the whole structure based on the changes in stabbing flank angle, upper stabbing flank corner radius, and lower stabbing flank corner radius. Additionally, the design criteria for the premium connection system were presented. The analytical results provided relationships between stresses and parameters that could be used as design conditions. The amount of von Mises stress received from the threaded connection depending on the change in each parameter was used to design an appropriate premium connection based on real-world field demand, cost, and structural efficiency.