深水半潜式平台聚酯纤维系泊方案分析

Analysis of the polyester fibre mooring scheme for deep water semi-submersible platforms

基于某目标气田深水半潜式生产平台的动力特性,其系泊方案拟采用一套张紧型聚酯纤维系泊系统。根据ABS推荐方法,采用耦合动力学分析技术,对该系泊方案进行了强度与疲劳分析,研究了不同系泊刚度模型对校核结果的影响,并开展了环境条件、平台吃水及缆绳拖曳力系数等因素的敏感性分析。分析结果表明:在设计环境条件下,系泊系统的极限强度与疲劳寿命均可满足规范要求;相对于静动态刚度结合模型,上下边界刚度模型将产生更大的系泊张力与疲劳损伤;对于系泊缆绳强度而言,最不利环境条件是当谱峰周期取其标准值时,此外深水条件下系泊缆绳的黏性拖曳力系数对缆绳张力的影响较大。本文研究结果可为聚酯纤维应用于深水系泊系统提供参考。

Based on the dynamic characteristics of deep water semi-submersible production platforms in one target gas field,the proposed mooring scheme is a tensioned polyester fibre mooring system. By a method recommended by ABS and adopting the coupling dynamics analysis technology,strength and fatigue of this mooring scheme are analyzed,the influences of different mooring rigidity models on the verification results are researched,and the sensitivity analysis of environment conditions,platform draft,cable drag coefficient and other factors is conducted. The analysis results indicate that in the designed environment conditions,ultimate strength and fatigue life of this mooring system can meet the requirements of specifications; compared with the static-dynamic combined rigidity model,the upper-lower boundary rigidity model will generate higher mooring tension and more fatigue damages; with respect to the strength of mooring cable,the most unfavorable environmental condition is that the spectral peak period is the standard value; furthermore,the viscous drag coefficient of mooring cable in deep water greatly influences the tension of cable. The research results of this paper can provide references for application of polyester fibre in the deep water mooring system.