摘要
与传统管道相比,海洋非粘结柔性管具有良好的柔韧性与适用性,逐渐成为深海油气运输的核心装备。柔性管在海洋中受到巨大的拉伸载荷,其响应规律的研究对柔性管的设计及应用具有重要意义。鉴于此,采用有限元法建立了柔性管的完全三维等效模型,分析了轴向拉伸载荷下柔性管在抗拉铠装层出现损伤的条件下以及存在其他不同外载荷条件下的响应,并对不同情况下所得的拉伸刚度进行了比较。分析结果表明:抗拉铠装层的损伤会出现不同程度的应力集中现象,并且在一定程度上降低柔性管的拉伸刚度,其中抗拉铠装层的外层损伤与内层损伤对拉伸刚度的影响差别并不明显;其他外载荷也会对柔性管拉伸响应产生相应的影响,如适当大小的静水压力会增强柔性管的拉伸刚度,但过大的静水压力会使柔性管骨架层压溃和塌陷,扭矩会相对降低柔性管的拉伸刚度。研究结果可对柔性管的设计制造以及其应用中预测柔性管的刚度变化起到参考作用。
Compared with traditional pipes, the marine unbonded flexible pipe has good flexibility and applicability, and has gradually become the key equipment of deep-sea oil and gas transportation. The flexible pipe will be subjected to great tensile loads in the ocean;thus, the study of response law is of great significance to the design and application of flexible pipe. In this paper, a complete 3 D equivalent model of the flexible pipe was established with the finite element method. With this model, the responses of flexible pipes in the case that its tensile armour was damaged under axial tensile load and that other external loads existed were analyzed, and the tensile stiffness in different cases was compared. The results show that the damage of the tensile armour may present stress concentration to different degrees and reduce the tensile stiffness of the flexible pipe to a certain extent, and the influence of the outer layer and inner layer steel tape damages of the tensile armour on the tensile stiffness is not obvious. Other external loads also have certain influence on the tensile response of the flexible pipe, for example, an appropriate hydrostatic pressure will enhance the tensile stiffness of the flexible pipe;however, too high hydrostatic pressure will make the carcass layer collapse, and the torque will relatively reduce the tensile stiffness of the flexible pipe. The research results provide a reference for design and manufacturing of flexible pipes and predicting the stiffness variation in the application.
作者
汤历平
姚红
罗衡
宋柯楠
石咏衡
Tang Liping;Yao Hong;Luo Heng;Song Kenan;Shi Yongheng(School of Mechatronic Engineering,Southwest Petroleum University;CNOOC Safety and Technology Services Co.,Ltd.;Oil&Gas Control Center,China Oil&Gas Pipeline Network Corporation)
出处
《石油机械》
北大核心
2022年第4期72-79,共8页
China Petroleum Machinery
基金
四川省重点研发项目“用于提高页岩气水平井钻井效率的高频扭转冲击技术研究及装备开发”(2017GZ0365)。
关键词
非粘结柔性管
有限元法
拉伸载荷
抗拉铠装层
拉伸刚度
unbonded flexible pipe
finite element method
tensional load
tensile steel tape armour
tensile stiffness
