Safety Analysis of Flange Joint Collapse in Deep Water Drilling Risers

doi:10.11885/j.issn.1674-5086.2017.07.25.02

Abstract

Abstract: In deep water drilling, the flange joints of drilling risers are usually exposed to complex and harsh environmental loads while experiencing a high difference between internal and external pressure. Therefore, it is necessary to monitor the stress in these flange joints while drilling. In this study, a finite element model of a flange joint was developed for analyzing the stress distribution and critical collapse pressure of both a wear-free and a worn flange joint in a drilling riser under different external load conditions. The results showed that the flange joint satisfied the strength safety requirement under bolt preload and working load conditions. When applying an external load on a wear-free flange joint, the maximum stress inside the flange joint increased with increasing external load. Once the external load reached a certain threshold, a stress concentration formed on the T-shaped platform at the auxiliary pipeline junction in the upper flange joint. When applying an external load on a worn flange joint, the critical collapse pressure of the flange joint decreased with increasing depth of the wear.

Key words: flange joint, finite element, collapse pressure, external load, degree of wear

CLC Number:

TE319

LIU Qingyou, HE Junjiang, MAO Liangjie. Safety Analysis of Flange Joint Collapse in Deep Water Drilling Risers[J]. 西南石油大学学报(自然科学版), 2018, 40(5): 163-169.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2017.07.25.02

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2018/V40/I5/163

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