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Research Papers: Piper and Riser Technology

Dynamic Response of Steel Catenary Riser in an Internal Wave Field

[+] Author and Article Information
Min Lou

School of Petroleum Engineering,
China University of Petroleum (East China),
No. 66, West Changjiang Road,
Huangdao District,
Qingdao 266580, China
e-mail: shidaloumin@163.com

Bing Tong

School of Petroleum Engineering,
China University of Petroleum (East China),
No. 66, West Changjiang Road,
Huangdao District,
Qingdao 266580, China
e-mail: tongbing18@qq.com

Yangyang Wang

China Petroleum Pipeline Engineering Co., Ltd.,
No. 146, Heping Road,
Guangyang District,
Langfang 065000, China
e-mail: 783200253@qq.com

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received November 22, 2017; final manuscript received April 22, 2018; published online May 21, 2018. Assoc. Editor: Hans Bihs.

J. Offshore Mech. Arct. Eng 140(5), 051705 (May 21, 2018) (13 pages) Paper No: OMAE-17-1207; doi: 10.1115/1.4040097 History: Received November 22, 2017; Revised April 22, 2018

This paper proposes a dynamic model for steel catenary risers (SCRs) based on the principle of virtual work, where the equations of motion are obtained by combining Euler's equation and initial conditions. The motion equations of the floating platform are transformed and combined with those of the riser to establish the complete model. Vertical structure and dispersion of the internal wave are calculated to obtain the internal wave load and combined with the floating platform motion. The whole motion equation of the riser was solved by the Newmark β method. A proprietary matlab algorithm was written to analyze the influence of different factors on the dynamic response of the riser in an internal wave field. Top tension had a significant effect on the riser dynamic characteristics and response. Floating platform movement determines the vibration frequency of the riser, considering the internal wave as an external force, to promote the whole movement of the riser. The maximum riser displacement was mainly affected by the internal wave, where the top corner was mainly from the floating platform movement.

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References

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Figures

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Fig. 1

Large deformation of deep water risers

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Fig. 2

Whole analysis model for SCRs and floating platform

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Fig. 3

Steel catenary riser resonance response: (a) V = 5 m/s, (b) V = 10 m/s, and (c) V = 15m/s

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Fig. 4

Steel catenary riser displacement: (a) H = 30 m, (b) H = 80 m, (c) H = 180 m, and (d) H = 280 m

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Fig. 5

Steel catenary riser (left) displacement and (right) spectrograms for different internal wave periods (T): (a) T = 10 min, (b) T = 20 min, (c) T = 30 min, and (d) T = 60 min

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Fig. 6

Steel catenary riser top rotation for different internal wave periods: (a) T = 10 min, (b) T = 20 min, (c) T = 30 min, and (d) T = 60 min

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Fig. 7

Steel catenary riser displacement for different internal wave amplitudes (Z)

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Fig. 8

Steel catenary riser top rotation for different internal wave amplitudes (Z)

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Fig. 9

Steel catenary riser displacement for different platform motion amplitudes (A)

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Fig. 10

Steel catenary riser top rotation for different platform motion amplitudes (A)

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Fig. 11

Steel catenary riser displacement for the integrated model at different top tensions (Tt): (a) internal wave effects, (b) platform effects, and (c) internal wave and platform combined effects

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Fig. 12

Different action modes for different top tensions (Tt): (a) Tt = 100 kN, (b) Tt = 500 kN, and (c) Tt = 1000 kN

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Fig. 13

Steel catenary riser displacement for different flow velocities (V): (a) internal wave effects, (b) platform effects, and (c) combined internal wave and platform effects

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