내부 슬러그 유동을 고려한 SLWR 피로해석 연구

Abstract

The riser system, which transfer production fluid from the well to the process facility is an import system for deep water field development. In this study, Steel Lazy Wave Riser (SLWR) was introduced into deep and harsh environmental conditions. SLWR has the advantages of reducing excessive line tension at the hang-off position and fatigue damage at the touchdown point, compared to typical Steel Catenary Riser(SCR). The lazy wave configuration implemented using buoyancy modules varies continuously depends on the flow pattern of the production fluid. In this paper, a dynamic analysis was carried out taking into account the influence of internal flow conditions, especially for slug flow data calculated using multi-phase flow analysis for strength assessment. Fatigue analysis was performed for both flow conditions of constant flow and slug flow to investigate the effect of internal flow conditions on fatigue damages of SLWR at several critical locations.