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Analytical model for transfer process of deepwater steel lazy-wave riser on elastic seabed

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Abstract

The steel lazy-wave riser (SLWR) is considered as an appropriate approach for deepwater riser installation due to its advantages in service performance. However, the introduction of buoyancy modules system brings about the great nonlinearity of lazy wave configuration in installation, especially during transfer process. This paper presents a comprehensive analytical model to analyze the behavior of SLWR during transfer process which is of great importance to the installation feasibility and analysis. Taking the elastic seabed and boundary-layer phenomenon into consideration, this analytical model is able to deal with the three different stages of the actual transfer process. The reliability of the proposed analytical model is verified and a typical SLWR transfer process analysis is conducted to investigate the riser configurations and some important mechanical parameters which exert influences on the riser’s performance. The proposed method provides a practical reference for the design and analysis of actual SLWR installation.

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Acknowledgements

This paper is funded by the National Key Research and Development Plan (Grant no. 2016YFC0303708), National Natural Science Foundation of China (Grant no. 51779266) and  Science Foundation of China University of Petroleum, Beijing (No.C201602).

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Authors and Affiliations

  1. Institute for Ocean Engineering, China University of Petroleum, Beijing, China

    Yi Wang, Menglan Duan & Jijun Gu

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  1. Yi Wang
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  2. Menglan Duan
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  3. Jijun Gu
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Correspondence to Yi Wang.

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Wang, Y., Duan, M. & Gu, J. Analytical model for transfer process of deepwater steel lazy-wave riser on elastic seabed. J Mar Sci Technol 24, 123–133 (2019). https://doi.org/10.1007/s00773-018-0540-8

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  • DOI: https://doi.org/10.1007/s00773-018-0540-8

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