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Effect of Axial Compression and Wet Collapse Loads on Torsional Response of Flexible Pipe

  • Research Article - Petroleum Engineering
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Abstract

Flexible pipes connect the two critical systems of the floating production platform and underwater production, which play an important role in the transportation of oil and gas as well as water injection. However, flexible pipes are often subjected to multiple loads that threaten their stability in the service process. In this study, a model of a flexible pipe containing practical cross section in all layers is established to study the effects of axial compression and wet collapse loads on clockwise and anticlockwise torsional responses. The results of calculation show that the axial compression and radial expansion of the flexible pipe are caused by the axial compression load, which reduces clockwise torsional stiffness. The wet collapse load induces the bending deformation of the flexible pipes in clockwise and anticlockwise torsion, where the bending deformation of clockwise torsion is significantly affected by the change in the Young’s modulus of the tensile armor layers. This study shows that clockwise torsional stiffness is small and exhibits a trend of axial compression. Clockwise torsion has poor stability in combination with axial compression and wet collapse loads, respectively. Therefore, to prevent instability in flexible pipes, clockwise torsion load, or which coupled with axial compression and wet collapse load, should be avoided.

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Acknowledgements

This study was supported by the Natural Science Foundation of China (51674214), the International Cooperation Project of the Sichuan Science and Technology Plan (2016HH0008), and the Plan Project of Sichuan Provincial and Technology (2018JY0058).

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Authors and Affiliations

  1. Southwest Petroleum University, Chengdu, Sichuan, China

    Xiaohua Zhu & Qinglong Lei

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  1. Xiaohua Zhu
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  2. Qinglong Lei
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Correspondence to Xiaohua Zhu.

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Zhu, X., Lei, Q. Effect of Axial Compression and Wet Collapse Loads on Torsional Response of Flexible Pipe. Arab J Sci Eng 44, 10397–10408 (2019). https://doi.org/10.1007/s13369-019-04075-3

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  • DOI: https://doi.org/10.1007/s13369-019-04075-3

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