Abstract This study has established a nonlinear flow-induced vibration (FIV) model of tubing string by using the micro-element method and energy method with the Hamiltonian variational principle, in order to address the vibration failure problem of the tubing string induced by high-speed fluid flow in the tubing of high temperature and high pressure (HPHT) oilg ②with the increase of the well inclination angle, the vibration response of the tubing string decreased to a certain extent. Regarding the influence of the well section length, the longitudinal vibration response of the tubing string was most sensitive to the length of the vertical section, followed by the steady inclined section, and finally the angle building section. Thus, during designing, the length of the vertical section should be reduced, while the length of the angle building section and the well inclination angle of the steady inclined section should be increased; ③As the position of the production packer moved up, the vibration responses of the lower and middle tubing strings both decreased, and the optimal packer position was between 3,549 and 3,666 m. The research results can serve as an effective analysis tool and provide a theoretical basis for the safety design of the tubing strings in the HPHT oil&gas well site.

中文翻译：

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高温高压油气井管柱非线性流激振动响应特性

摘要 本研究利用微元法和能量法，结合哈密顿变分原理，建立了管柱的非线性流动诱导振动（FIV）模型，以解决油管柱因高应力引起的振动破坏问题。高温高压（HPHT）油管内高速流体流动②随着井斜角的增大，管柱的振动响应有一定程度的降低。关于井段长度的影响，管柱纵向振动响应对垂直段长度最敏感，其次是稳定倾斜段，最后是建角段。因此，在设计时，应减少垂直截面的长度，同时应增加建角段的长度和稳定倾斜段的井倾角；③随着生产封隔器位置上移，下、中油管柱振动响应均减小，最佳封隔器位置在3549～3666m之间。研究成果可作为有效的分析工具，为高温高压油气井场油管柱的安全设计提供理论依据。