非黏结柔管在海洋油气田的开发中得到广泛应用,其扭转平衡是保证作业期间结构安全的重要原则,然而现有分析理论简化假设较多,导致仍有非黏结柔管设计出现扭转不平衡现象.为了提高扭转模拟的准确性,不影响管道实际使用,本文聚焦现有设计分析中所忽视的螺旋铠装内外侧耐磨胶带,基于理论推导,建立耐磨胶带层扭转刚度及弹性模量修正算法,结合有限元模型,探究胶带层叠压对于非黏结柔管整体扭转的影响.结果显示,采用经过修正的胶带层弹性模量所得管道扭转结果更接近实测结果,对实际工程应用具有一定的指导意义.进一步研究发现,非黏结软管的整体扭转角与耐磨胶带的宽度正相关,与耐磨胶带的铺设角负相关,而随着叠压率增加,管道扭转角减小.

Unbonded flexible pipe has been widely used in the offshore oil and gas industry and its torsional balance plays an important role in safety insurance during the whole service life. However, there are still torsional imbalances due to simplifying assumptions in the current analytical theory. To improve the accuracy of torsion simulation and reduce the impacts on the practical applications of the pipelines, this paper focuses on the wear-resistant layer neglected in previous studies. Based on theoretical derivation, in combination with the finite element method, a correction algorithm for the torsional stiffness and elastic modulus of the tape layer is developed to investigate the effect of tape layer stacking on the overall torsion of the unbonded flexible pipe. The results show that overall torsion results obtained by using the corrected elastic modulus of the tape layer are closer to the test results, which have guiding significance for practical applications. Further sensitivity research shows that the width of the tape layer is positively correlated with the flexible pipe torsion angle, while the tape laying angle is negatively correlated with the overall torsion angle. With an increase in the stacking ratio of the tape, the pipeline torsion angle decreases.