Research Papers: Offshore Technology

Flow-Induced Vibration in Subsea Jumper Subject to Downstream Slug and Ocean Current

[+] Author and Article Information
Yaojun Lu, Chun Liang, Juan J. Manzano-Ruiz, Kalyana Janardhanan

Bechtel Corporation,
Houston, TX 77056

Yeong-Yan Perng

ANSYS, Inc.,
Austin, TX 78746

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received June 16, 2014; final manuscript received November 17, 2015; published online February 24, 2016. Editor: Solomon Yim.

J. Offshore Mech. Arct. Eng 138(2), 021302 (Feb 24, 2016) (10 pages) Paper No: OMAE-14-1063; doi: 10.1115/1.4032225 History: Received June 16, 2014; Revised November 17, 2015

This paper presents a multiphysics approach for characterizing flow-induced vibrations (FIVs) in a subsea jumper subject to internal production flow, downstream slug, and ocean current. In the present study, the physical properties of production fluids and associated slugging behavior were characterized by pvtsim and olga programs under real subsea condition. Outcomes of the flow assurance studies were then taken as inputs of a full-scale two-way fluid–structure interaction (FSI) analysis to quantify the vibration response. To prevent onset of resonant risk, a detailed modal analysis has also be carried out to determine the modal shapes and natural frequencies. Such a multiphysics approach actually integrated the best practices currently available in flow assurance (olga and pvtsim), computational fluid dynamics (CFD), finite element analysis (FEA), and modal analysis, and hence provided a comprehensive solution to the FSI involved in a subsea jumper. The corresponding results indicate that both the internal production flow, downstream slugs, and the ocean current would induce vibration response in the subsea jumper. Compared to the vortex-induced vibration (VIV) due to the ocean current and the FIV due to the internal production flow, pressure fluctuation due to the downstream slug plays a dominant role in generating excessive vibration response and potential fatigue failure in the subsea jumper. Although the present study was mainly focused on the subsea jumper, the same approach can be applied to other subsea components, like subsea flowline, subsea riser, and other subsea production equipment.

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Fig. 1

Field layout of subsea production system

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Fig. 2

Overall configuration of subsea jumper

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Fig. 3

Phase envelope of production fluids

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Fig. 4

Pressure profile along flowline path

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Fig. 5

Profile of liquid holdup along flowline path

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Fig. 6

Pressure fluctuation at jumper outlet

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Fig. 7

Pressure fluctuation in small time window

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Fig. 8

Reduced pressure profiles

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Fig. 9

Vibration shape of subsea jumper

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Fig. 10

Deformation at the lower left corner

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Fig. 11

Deformation at the middle point

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Fig. 12

Deformation at the lower right corner

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Fig. 13

FFT of total deformation at lower left corner

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Fig. 14

FFT of total deformation at middle point

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Fig. 15

FFT of total deformation at lower right corner

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Fig. 16

The first ten modal shapes




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