Dynamic mechanical behavior analysis of deep water drilling riser under hard hang-off evacuation conditions. (1st July 2019)

• Record Type: Journal Article
• Authors: Mao, Liangjie; Zeng, Song; Liu, Qingyou
• Is Part Of: Ocean engineering. Volume 183(2019)
• Page Start: 318
• Page End: 331
• Publication Date: 2019-07-01
• Subjects: Drilling riser -- Deep water -- Hard hang-off -- Dynamic analysis; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2019.05.014
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: A dynamic analysis model for a drilling riser under hard hang-off conditions was established, and the model was solved by finite element method in combination with the Newmark β method and verified by comparing the results with similar researches. The influences of evacuation and current speeds, the desired track of the drilling platform, the weight of lower marine riser package (LMRP) and the length of the hang-off drilling riser on drilling riser deformation and bending moment were analyzed. Results indicate that the most fragile part of riser is the upper joint on the top end and the platform speed and track direction are key operable parameters during the emergency evacuation; keeping the platform moving a little faster than the surface current speed especially with a heavy LMRP is favorable for reducing the deformation of the riser; the desired track of drilling platform is along the ocean current; recycling the riser helps reduce the deformation but harms the upper joint of the riser. These results can provide a basis for making evacuation plans of the platform, provide a theoretical guarantee for the safety of the hard hang-off riser, and serve as a reference for the production and installation of the riser. Highlights: Established the analysis model of deep water drilling riser under hard hang-off evacuation conditions. Solved the analysis model via Newmark-β method. Verified the model by comparing the results from Orcaflex and ANSYS software. Discussed the influence of evacuation factors on dynamic mechanical behavior of hard hang-off riser.