深水半潜式钻井平台纤维材料系泊方案研究

Research on Fiber Material Mooring Scheme of the Deepwater Semi-submersible Drilling Platform

针对一个工作于墨西哥湾海域1500m水深的半潜式钻井平台,选择polyester PET,polyester PEN和HMPE三种合成纤维材料及不同轴向刚度进行系泊方案设计,考虑系泊线的非线性动态特性和平台与系泊线之间的相互影响,在时域内进行耦合计算分析.并与传统的锚链钢缆组合的悬链线式系泊方式进行比较,发现悬链线方式很难保证平台的活动半径在要求范围之内,而由新型纤维材料组成的张紧式系泊方式则能达到良好的定位效果.经进一步对三种材料系泊系统对平台运动和系泊线受力以及经济性的比较,确定polyester PET最满足此半潜式钻井平台的安全作业要求.

Mooring system design of a semi-submersible drilling platform which works in 1500m water depth of Gulf of Mexico was carried out,new synthetic fiber named polyester PET,polyester PEN and HMPE were selected as mooring line and the influence of different EA values were discussed.The mooring line is nonlinear and dynamic,and it is completely coupled with platform in time domain.Catenary mooring system made up of chain and wire was also analyzed,and after comparison,it is found difficult for catenary system to keep platform within required watch radius,while taut mooring system made up of synthetic ropes has better position capacity.Then platform displacements and mooring line forces and economics of different schemes were compared in detail,and polyester PET is found to be the best to keep the platform in safe.