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Research Papers: Piper and Riser Technology

Dynamic Effect of a Flexible Riser in a Fully Connected Semisubmersible Drilling Rig Using the Absolute Nodal Coordinate Formulation

[+] Author and Article Information
Seung-Ho Ham

Department of Naval Architecture and
Ocean Engineering,
Seoul National University,
1 Gwanak-ro, Gwanak-gu,
Seoul 08826, South Korea

Myung-Il Roh

Department of Naval Architecture and
Ocean Engineering;
Research Institute of
Marine Systems Engineering,
Seoul National University,
1 Gwanak-ro, Gwanak-gu,
Seoul 08826, South Korea
e-mail: miroh@snu.ac.kr

Jeong-Woo Hong

Offshore Engineering Research Department,
Advance Technology Research Institute,
Hyundai Heavy Industries Co., Ltd.,
400, Bangeojinsunhwan-doro, Dong-gu,
Ulsan 44114, South Korea

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 30, 2016; final manuscript received May 11, 2017; published online July 6, 2017. Assoc. Editor: Robert Seah.

J. Offshore Mech. Arct. Eng 139(5), 051705 (Jul 06, 2017) (10 pages) Paper No: OMAE-16-1153; doi: 10.1115/1.4037084 History: Received November 30, 2016; Revised May 11, 2017

The motion of a semisubmersible drilling rig must be checked in advance to satisfy the safety criteria of the rig. However, the complexity of the rig's connections makes it difficult to analyze the rig motion during the drilling operation because it is connected to the seabed by the blow-out preventer (BOP). The rig's connections consist of several pieces of risers, a telescopic joint, and a riser tensioner system. Also, from a macroscopic perspective, the risers should be regarded as flexible threads. Therefore, this study developed a rig motion analysis program considering the deformable effects of flexible risers and the full connectivity of the drilling rig. Flexible multibody dynamics (FMBD) based on the absolute nodal coordinate formulation (ANCF) is adapted for the mathematical modeling of the risers and joints. Acting as an external disturbance, a hydrodynamic force and current force are exerted on the drilling rig and the risers, respectively. The drilling rig is fully modeled including the riser tensioner system, telescopic joint, flexible risers, and upper and lower flex joints. The motion analysis with and without connections was fulfilled to verify the effect of connectivity. Moreover, we observed that the movement of the drilling rig increases as the current speed increases. Finally, the simulation is successfully applied to check the motions and tensions of the drilling rig in moderate and storm conditions.

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References

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Figures

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Fig. 2

Configurations of the semisubmersible drilling rig connected by risers

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Fig. 3

Bodies and joints of the drilling rig

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Fig. 1

Numerical analysis procedure of flexible dynamics system

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Fig. 7

Motion of the drilling rig in moderate condition

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Fig. 8

Motion of the telescopic joint in moderate condition

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Fig. 9

Force acting on hydraulic and pneumatic cylinder, and tension of wirelines in moderate condition

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Fig. 10

Motion of the drilling rig in storm condition

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Fig. 11

Motion of the telescopic joint in storm condition

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Fig. 12

Force acting on hydraulic and pneumatic cylinder, and tension of wirelines in storm condition

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Fig. 4

Heave motion with and without connections

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Fig. 5

Horizontal displacement according to current speeds acting on the riser (t = 515 s)

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Fig. 6

Surge motion of the rig due to the riser displacement

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