南海自由站立式立管设计与分析

自由站立式立管可作为南海油气开发的立管形式。根据设计参数建立自由站立式立管系统模型，根据南海某油田环境参数校核立管各工况下的强度结果并进行疲劳分析，探讨自由站立式立管动态强度与疲劳特性并验证是否满足规范要求。分析结果表明：该立管设计满足规范中的强度与疲劳要求，且疲劳性能较好；立管等效应力最大处为立管主体顶部应力节下端；最危险浪流方向为沿立管向平台方向；立管主体应力水平受平台运动影响较小，受顶部张紧力以及海流大小影响较大；疲劳损伤最大处位于立管主体顶部，且涡激疲劳损伤大于浪致疲劳损伤。

Design and Analysis of Free Standing Hybrid Riser in South Sea

Free Standing Hybrid Riser (FSHR) is a good riser form of oil development in South China Sea. Based on riser and environment design parameters, this paper set up a FSHR finite element model and performed the strength and fatigue analysis in South China Sea, to discuss its strength and fatigue characteristics and determine whether it meets the design requirements. Calculation results show: This riser satisfies the strength and fatigue requirements of the code, and the fatigue damage is relatively small; The maximum equivalent stress occurs at the bottom of the upper stress joint; The most dangerous wave and current direction is from the riser to the platform, and the stress level is affected by platform motion small and by top tension and current greatly; The maximum fatigue damage occurs at the riser top,and the VIV fatigue damage is more serious than the wave-induced fatigue damage.