较深水导管架隔水套管悬挂平台的研制及工程应用

Development and Engineering Application of Suspension Platform in Deepwater Jacket for Hanging Riser

由于受到导管架平台顶水平层强度、作业水深、吊高、隔水套管强度、自由站立等因素的限制,东方1-1WHPF导管架首节隔水套管不能直接入泥,需悬挂在导管架上进行首节和第二节隔水套管的组对焊接工作,而导管架顶水平层强度不足,使得海上工程进度受阻,因此需根据其结构特点设计隔水套管悬挂平台,以提高导管架顶水平层强度。通过对东方1-1项目WHPF导管架隔水套管的力学分析及根据导管架EL.+7.5 m水平层强度及结构特点,设计了安装在导管架平台上的隔水套管悬挂平台,并利用ANSYS软件对其进行三维建模,分别对预挂2、3、4根φ762 mm(4节)隔水套管的悬挂平台进行结构强度分析,确定了合理的设计、安装、使用方案。工程应用表明,导管架平台安装了隔水套管悬挂平台后,解决了平台水平层悬挂强度不足的问题,悬挂的隔水套管数量增加到了4根,明显地提高了隔水套管安装作业效率,节约了船天数。

Owing to the limits of top horizontal layer strength of DF1-1 WHPF jacket platform,its operation water depth,hoisting height,riser strength and free standing,the first riser segment could not penetrate into soil. It needed to enhance the top horizontal layer strength of the jacket,so that the first riser segment could hang in the jacket and weld with the second riser segment. Based on the mechanical analysis of WHPF jacket and structural characteristic of the EL.＋7.5 m layer of the jacket,the suspension platform installed in the jacket for hanging riser was designed and its 3D model was established with ANSYS software. The structural strength analyses of the suspension platform hanging 2,3 and 4risers of Ф762 mm respectively were conducted and rational schemes of design,installation and application were determined. The engineering application shows that the suspension platform has enough strength and can hang 4 risers,and the efficiency of installing riser is raised greatly.