Axial force transfer characteristics of a coiled tubing conducting offshore rotary operation. (15th December 2021)

• Record Type: Journal Article
• Authors: Chen, Yingchun; Li, Yanfeng; Chuan, Jungang
• Is Part Of: Ocean engineering. Volume 242(2021)
• Publication Date: 2021-12-15
• Subjects: Coiled tubing -- Offshore mechanics -- Axial force transfer -- Rotary operation; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2021.110112
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: The coiled tubing (CT) rotary operation is a new technology being explored in the industry, where relevant research on the top torque's influence on the CT during rotary operation is missing. An indoor CT offshore rotary operation physical simulation system was built. Through theory and experiment, the influence of torque on the CT's axial force transmission characteristics in the offshore 'pipe in pipe' system is studied. The results show that the small constant torque applied at the CT top will not directly lead to string instability. However, the small constant torque applied at the CT top will reduce the limit loads of sinusoidal and helical buckling, leading to string instability at an earlier stage. Additionally, it is shown that torque would accelate string instability whereas the small top torque has little effect on the CT's axial force transfer efficiency. The research results will help to establish the theoretical guidance system of the CT offshore rotary operation. Highlights: an indoor Coiled Tubing offshore rotary operation experimental platform was built. torque applied at Coiled Tubing would accelerate string instability. small torque has little effect on the Coiled Tubing's axial force transfer efficiency.