深水测试地面流程弯管振动特性分析

Vibration Characteristics Analysis of Elbow in Surface Flow Process during Deep Water Testing

为了研究深水测试过程中地面流程管线振动引起的安全问题,分析了地面流程的设备组成,并根据管内流体流动的特点,对考虑流固耦合作用下的管道扭转、横向和纵向振动方程进行了分析。研究结果表明:在内压呈正弦波动的前1/4周期,弯管的响应参数波动大;内压压力均值对弯管响应参数的影响较压力变化幅值大,弯管的响应参数随压力均值的增大而增大;基频压力变化下的弯管安全系数随压力均值增大而显著减小;在内外径一致时,随着弯管弯曲半径的增大,弯管的最大位移响应增大、最大应力响应减小;在弯管弯角为90°、120°和150°时,弯管的最大位移响应先减小后增大,最大应力响应先增大后减小。研究结果对现场地面流程弯管选型和安全运营具有一定的指导作用。

To study the safety problems caused by the vibration of the surface pipeline during the deep water testing,the structural composition of the surface process is analyzed.According to the characteristics of the fluid flow in the pipe,the torsion,lateral and longitudinal vibration equations of the pipeline under the action of fluidsolid coupling are described.The research results show that the response parameters of the elbow fluctuate greatly in the first quarter of the cycle when the internal pressure fluctuates sinusoidally.The average value of the internal pressure has a greater impact on the response parameters of the elbow than the pressure change amplitude.The response parameters of the elbow increase with the pressure mean value.The safety factor of the elbow under the change of the fundamental frequency pressure decreases significantly with the pressure mean value.Given the same inner and outer diameters,as the bending radius of the elbow increases,the maximum displacement response of the elbow increases,and the maximum stress response decreases.Under the elbow angle of 90°,120°,and 150°,the maximum displacement response first decreases and then increases,and the maximum stress response first increases and then decreases.The research results have a certain guiding role for the selection and safe operation of on-site surface process elbows.