顺应式垂直通路立管新构型设计及其力学性能分析

为研究顺应式垂直通路立管（以下简称CVAR）的力学特性，本文基于虚功原理和变分原理创建了CVAR力学模型，并与文献结果进行对比验证，之后在原构型的基础上提出改进，在进一步校正浮力因子后对CVAR进行时域内的动力响应分析。结果表明：新构型相较于原构型不仅减少了浮力块的布置数量，而且在设计位置和极端偏移情况下都能保证良好的作业性能；新构型过渡段的浮力因子在1.08~1.82范围内能满足文中给出偏移情况下的作业要求；CVAR的动力分析中，下部区域（靠井口位置）的各项位移很小，能保持良好的作业性能；过渡段区域由于弯矩较大引起应力值较高，是应优先检测的位置。

New Configuration Design and Mechanical Performance Analysis of Compliant Vertical Access Riser

In order to research the mechanical characteristics of compliant vertical access riser (hereinafter referred to as CVAR), based on the principle of virtual work and principle of variation, a mechanical model of CVAR is established and verified by comparison with the results in literature. Then the improvement is proposed on the basis of the original configuration., Dynamic response analysis of CVAR in time domain after further correction of buoyancy factor. Dynamic analysis of CVAR in time domain was carried out. The results show that compared with the original configuration, the new configuration not only reduces the number of buoyancy blocks, but also guarantees good operation performance in the case of design position and extreme offset. The buoyancy factor of the transition section of the new configuration can meet the operation requirements given in the paper in the range of 1.08-1.82. In the dynamic analysis of CVAR, The displacement of the lower region (near the wellhead) is very small, which can maintain good operation performance. Because of the high bending moment, the stress value in the transition region is higher, so it should be detected first.