Incorporating Magneto-Rheological Damper into Riser Tensioner System to Restrict Riser Stroke in Moderate-Size Semisubmersibles
- Zaid Zainuddin (Texas A&M University) | Moo-Hyun Kim (Texas A&M University) | Heon-Yong Kang (Texas A&M University) | Shankar Bhat (Shell)
- Document ID
- Offshore Technology Conference
- Offshore Technology Conference, 30 April - 3 May, Houston, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Offshore Technology Conference
- 2.1.3 Completion Equipment, 4.5 Offshore Facilities and Subsea Systems, 4.2.4 Risers, 1.10 Drilling Equipment, 4 Facilities Design, Construction and Operation, 4.2 Pipelines, Flowlines and Risers, 1.10.5 Offshore Drilling Units, 4.5 Offshore Facilities and Subsea Systems
- magneto-rheological, riser, tensioner, semisubmersible, damper
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In case of conventional shallow-draft semisubmersibles, unacceptably large riser stroke was the restricting factor for dry-tree-riser-system development. Many developments to address this issue have focused on using larger draft and size with extra heave-damping plates, which results in a huge cost increase. The objective of this paper is to investigate an alternative solution by improving riser systems through the implementation of a magneto-rheological damper (MR Damper) so that it can be used with moderate-size/draft semisubmersibles. In this regard, both linear/viscous and MR-damper riser systems and connections are numerically modeled so that they can couple with hull-mooring time-domain simulations. The simulation results show that the moderate-size semisubmersible with MR damper system can be used with conventional dry-tree pneumatic tensioners by effectively reducing stroke-distance even in the most severe storm environments. Furthermore, the damping level of the MR damper can be controlled to best fit target cases by changing input electric currents. The reduction in stroke allows smaller topside deck spacing, which in turn leads to smaller deck and hull. As the penalty of reducing riser stroke by MR damper, the force on the riser system can significantly be increased.
|File Size||1 MB||Number of Pages||12|
Chen, Cheng-Yo, Xiaoming Mei, and Trevor Mills. 2007. "Effect of Heave Plate on Semisubmersible Response." International Offshore and Polar Engineering Conference Proceedings of the Sixteenth (2007) on 1-6 Jul 2007. Lisbon: The International Society of Offshore and Polar Engineers(ISOPE). 2218-2219.
Kang, Hooi-Siang, Shankar Bhat, Moo-Hyun Kim, and Heon-Yong Kang. 2014. "Dynamic Response Control of Top-Tension Risers by a Variable Damping and Stiffness with Magneto-Rheological Damper." International Conference on Ocean, Offshore and Artic Engineering. San Francisco: ASME. 1-2. Accessed June 2016.