On the Study of Hybrid Riser with Integrated Tether for Extreme Offshore Conditions in the Gulf of Guinea

Francisca Amarachukwu Duru; Chinwuba Victor Ossia; John Chukwudi Uzoewulu

doi:doi:10.11648/j.ijmea.20170501.17

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On the Study of Hybrid Riser with Integrated Tether for Extreme Offshore Conditions in the Gulf of Guinea

Francisca Amarachukwu Duru, Chinwuba Victor Ossia, John Chukwudi Uzoewulu

Received: 20 December 2016 Accepted: 30 December 2016 Published: 2 March 2017

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Abstract

This study presents the optimization of the hybrid risers in deepwater applications by the integration of a tether. It analyses the feasibility, impact and essence of attaching Polyester tether to the buoy of a conventional hybrid system using the Gulf of Guinea (GoG) wave conditions, and adopting a water depth of 1800m. The sensitivity of the convectional hybrid riser (CHR) and Tethered-Hybrid Riser system (THRS) were also analyzed and compared to observe its response with respect to effective tension and maximum von Mises stress. The findings reveals that the effective tension and stress experienced a 2.5% and 6.4% reduction for the fixed standing hybrid riser (FSHR) and flexible jumper, respectively; for the THRS when compared to the CHR configuration (with 10-years wave return period). The results also show that there should be appropriate vessel control in order to maintain the best response when in service over 10-year and 100-years extreme conditions. Hence, the Tethered Hybrid Riser System (THRS) yields a significant improvement when compared to the CHR.

DOI	10.11648/j.ijmea.20170501.17
Published in	International Journal of Mechanical Engineering and Applications (Volume 5, Issue 1, February 2017)
Page(s)	52-59
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Tethered Hybrid Riser, Conventional Hybrid Riser, Fixed Standing Hybrid Riser

References

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[2]	Yong, Bai., and Bai, Qui. "Subsea Pipelines and Risers". Oxford: Elsevier. 2005.
[3]	Yong, B., and Bai, Qui. "Subsea Engineering Hand Book". Houston: Elsevier. 2010.
[4]	Huang, S. "Risers and Mooring Lines". Glasgow: Department of Naval Architecture and Marine Engineering. 2004.
[5]	Clausen, T., and D' Souza, R. "Dynamic risers key component for deepwater drilling, floating production". Offshore Magazine, 89-93. 2001.
[6]	Mahone, W. C., Chandler, B. D., and Killeen, J. P. Patent No. 5702205. 1995.
[7]	Serta, O. B., Longo, C. E. V., and Roveri, F. E. "Riser Systems for Deep and Ultra-Deepwaters". Paper prepared for presentation at the Offshore Technology Conference, Houston, USA. 2001.
[8]	Yongming, C., Lixin, X., and Paul, S. "Design Challenges of Top Tensioned Risers in Ultra Deepwater Applications". Rotterdam: OMAE 2011-50127. 2011.
[9]	Ruxing, S., Paul, S., and Xiaoliang, Z. "Engineering Design of Deepwater Freestanding Hybrid Riser". Proceedings of the ASME 2010, 29th International Conferece in Ocean and Artic Engineering. Shan ghai: OMAE. 2010.
[10]	Elizabeth, T., and Thethi, R. "The Evolution of Free Standing Risers". Proceedings of the 28th ASME 28th International Conference on Ocean, Offshore and Artic Engineering. Honolulu: OMAE 2009-79487. 2011
[11]	Dale, H., and Karunakaran, D."Grouped SLOR Design and Implementation". Retrieved August 21, 2012, from WWW.2hoffshore.com: http://www.2hoffshore.com/documents/papers/The-Grouped-SLOR-Design-and-Implementation-2H-Format.pdf. 2007.
[12]	Madhu, H. "Emerging Trends in Riser Technologies". Retrieved August 22, 2012, from www.2hoffshore.com: http://www.2hoffshore.com/documents/papers/Emerging-Trends-in-Riser-Technologies-Ocean-Tex-Mumbai-March-2010.
[13]	Det Norske Veritas – DNV, “Offshore Standards DNV-OS-F201 - Dynamic Risers”, October 2010.
[14]	American Petroleum Institute, "API RP 2RD - Design of Risers For Floating Production Systems (FPS) and Tension-Leg Platforms (TLPs)". 1998.
[15]	ORCINA Limited. OrcaFlex Manual. Ulverston, Cumbria, Uniteg Kingdom. June 2012.
[16]	Andueza, A., Stefan, S., and Silve, R. "Ultra-Deepwater Steel Hybrid- Riser Concept Offshore Brazil". Offshore Technology Conference (pp. 1-8). Houston: OTC 13255, 2001.
[17]	American Petroleum Institute, "API-RP-2SK - Design and Analysis of Stationkeeping Systems for Floating Structures" (3rd ed.). Washington: API American Petroleum Institute. 2005.

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Francisca Amarachukwu Duru, Chinwuba Victor Ossia, John Chukwudi Uzoewulu. (2017). On the Study of Hybrid Riser with Integrated Tether for Extreme Offshore Conditions in the Gulf of Guinea. International Journal of Mechanical Engineering and Applications, 5(1), 52-59. https://doi.org/10.11648/j.ijmea.20170501.17

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ACS Style

Francisca Amarachukwu Duru; Chinwuba Victor Ossia; John Chukwudi Uzoewulu. On the Study of Hybrid Riser with Integrated Tether for Extreme Offshore Conditions in the Gulf of Guinea. Int. J. Mech. Eng. Appl. 2017, 5(1), 52-59. doi: 10.11648/j.ijmea.20170501.17

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AMA Style

Francisca Amarachukwu Duru, Chinwuba Victor Ossia, John Chukwudi Uzoewulu. On the Study of Hybrid Riser with Integrated Tether for Extreme Offshore Conditions in the Gulf of Guinea. Int J Mech Eng Appl. 2017;5(1):52-59. doi: 10.11648/j.ijmea.20170501.17

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@article{10.11648/j.ijmea.20170501.17,
  author = {Francisca Amarachukwu Duru and Chinwuba Victor Ossia and John Chukwudi Uzoewulu},
  title = {On the Study of Hybrid Riser with Integrated Tether for Extreme Offshore Conditions in the Gulf of Guinea},
  journal = {International Journal of Mechanical Engineering and Applications},
  volume = {5},
  number = {1},
  pages = {52-59},
  doi = {10.11648/j.ijmea.20170501.17},
  url = {https://doi.org/10.11648/j.ijmea.20170501.17},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmea.20170501.17},
  abstract = {This study presents the optimization of the hybrid risers in deepwater applications by the integration of a tether. It analyses the feasibility, impact and essence of attaching Polyester tether to the buoy of a conventional hybrid system using the Gulf of Guinea (GoG) wave conditions, and adopting a water depth of 1800m. The sensitivity of the convectional hybrid riser (CHR) and Tethered-Hybrid Riser system (THRS) were also analyzed and compared to observe its response with respect to effective tension and maximum von Mises stress. The findings reveals that the effective tension and stress experienced a 2.5% and 6.4% reduction for the fixed standing hybrid riser (FSHR) and flexible jumper, respectively; for the THRS when compared to the CHR configuration (with 10-years wave return period). The results also show that there should be appropriate vessel control in order to maintain the best response when in service over 10-year and 100-years extreme conditions. Hence, the Tethered Hybrid Riser System (THRS) yields a significant improvement when compared to the CHR.},
 year = {2017}
}

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TY  - JOUR
T1  - On the Study of Hybrid Riser with Integrated Tether for Extreme Offshore Conditions in the Gulf of Guinea
AU  - Francisca Amarachukwu Duru
AU  - Chinwuba Victor Ossia
AU  - John Chukwudi Uzoewulu
Y1  - 2017/03/02
PY  - 2017
N1  - https://doi.org/10.11648/j.ijmea.20170501.17
DO  - 10.11648/j.ijmea.20170501.17
T2  - International Journal of Mechanical Engineering and Applications
JF  - International Journal of Mechanical Engineering and Applications
JO  - International Journal of Mechanical Engineering and Applications
SP  - 52
EP  - 59
PB  - Science Publishing Group
SN  - 2330-0248
UR  - https://doi.org/10.11648/j.ijmea.20170501.17
AB  - This study presents the optimization of the hybrid risers in deepwater applications by the integration of a tether. It analyses the feasibility, impact and essence of attaching Polyester tether to the buoy of a conventional hybrid system using the Gulf of Guinea (GoG) wave conditions, and adopting a water depth of 1800m. The sensitivity of the convectional hybrid riser (CHR) and Tethered-Hybrid Riser system (THRS) were also analyzed and compared to observe its response with respect to effective tension and maximum von Mises stress. The findings reveals that the effective tension and stress experienced a 2.5% and 6.4% reduction for the fixed standing hybrid riser (FSHR) and flexible jumper, respectively; for the THRS when compared to the CHR configuration (with 10-years wave return period). The results also show that there should be appropriate vessel control in order to maintain the best response when in service over 10-year and 100-years extreme conditions. Hence, the Tethered Hybrid Riser System (THRS) yields a significant improvement when compared to the CHR.
VL  - 5
IS  - 1
ER  -

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Author Information

Francisca Amarachukwu Duru

Offshore Technology Institute, ETF Gas Engineering Building, University of Port Harcourt, Port Harcourt, Nigeria
Chinwuba Victor Ossia

Offshore Technology Institute, ETF Gas Engineering Building, University of Port Harcourt, Port Harcourt, Nigeria
John Chukwudi Uzoewulu

Health, Safety & Environment Department, Port Harcourt Refining Company, Nigeria National Petroleum Corporation, Eleme, Port Harcourt, Nigeria

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APA Style

Francisca Amarachukwu Duru, Chinwuba Victor Ossia, John Chukwudi Uzoewulu. (2017). On the Study of Hybrid Riser with Integrated Tether for Extreme Offshore Conditions in the Gulf of Guinea. International Journal of Mechanical Engineering and Applications, 5(1), 52-59. https://doi.org/10.11648/j.ijmea.20170501.17

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ACS Style

Francisca Amarachukwu Duru; Chinwuba Victor Ossia; John Chukwudi Uzoewulu. On the Study of Hybrid Riser with Integrated Tether for Extreme Offshore Conditions in the Gulf of Guinea. Int. J. Mech. Eng. Appl. 2017, 5(1), 52-59. doi: 10.11648/j.ijmea.20170501.17

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AMA Style

Francisca Amarachukwu Duru, Chinwuba Victor Ossia, John Chukwudi Uzoewulu. On the Study of Hybrid Riser with Integrated Tether for Extreme Offshore Conditions in the Gulf of Guinea. Int J Mech Eng Appl. 2017;5(1):52-59. doi: 10.11648/j.ijmea.20170501.17

Copy | Download

@article{10.11648/j.ijmea.20170501.17,
  author = {Francisca Amarachukwu Duru and Chinwuba Victor Ossia and John Chukwudi Uzoewulu},
  title = {On the Study of Hybrid Riser with Integrated Tether for Extreme Offshore Conditions in the Gulf of Guinea},
  journal = {International Journal of Mechanical Engineering and Applications},
  volume = {5},
  number = {1},
  pages = {52-59},
  doi = {10.11648/j.ijmea.20170501.17},
  url = {https://doi.org/10.11648/j.ijmea.20170501.17},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmea.20170501.17},
  abstract = {This study presents the optimization of the hybrid risers in deepwater applications by the integration of a tether. It analyses the feasibility, impact and essence of attaching Polyester tether to the buoy of a conventional hybrid system using the Gulf of Guinea (GoG) wave conditions, and adopting a water depth of 1800m. The sensitivity of the convectional hybrid riser (CHR) and Tethered-Hybrid Riser system (THRS) were also analyzed and compared to observe its response with respect to effective tension and maximum von Mises stress. The findings reveals that the effective tension and stress experienced a 2.5% and 6.4% reduction for the fixed standing hybrid riser (FSHR) and flexible jumper, respectively; for the THRS when compared to the CHR configuration (with 10-years wave return period). The results also show that there should be appropriate vessel control in order to maintain the best response when in service over 10-year and 100-years extreme conditions. Hence, the Tethered Hybrid Riser System (THRS) yields a significant improvement when compared to the CHR.},
 year = {2017}
}

Copy | Download

TY  - JOUR
T1  - On the Study of Hybrid Riser with Integrated Tether for Extreme Offshore Conditions in the Gulf of Guinea
AU  - Francisca Amarachukwu Duru
AU  - Chinwuba Victor Ossia
AU  - John Chukwudi Uzoewulu
Y1  - 2017/03/02
PY  - 2017
N1  - https://doi.org/10.11648/j.ijmea.20170501.17
DO  - 10.11648/j.ijmea.20170501.17
T2  - International Journal of Mechanical Engineering and Applications
JF  - International Journal of Mechanical Engineering and Applications
JO  - International Journal of Mechanical Engineering and Applications
SP  - 52
EP  - 59
PB  - Science Publishing Group
SN  - 2330-0248
UR  - https://doi.org/10.11648/j.ijmea.20170501.17
AB  - This study presents the optimization of the hybrid risers in deepwater applications by the integration of a tether. It analyses the feasibility, impact and essence of attaching Polyester tether to the buoy of a conventional hybrid system using the Gulf of Guinea (GoG) wave conditions, and adopting a water depth of 1800m. The sensitivity of the convectional hybrid riser (CHR) and Tethered-Hybrid Riser system (THRS) were also analyzed and compared to observe its response with respect to effective tension and maximum von Mises stress. The findings reveals that the effective tension and stress experienced a 2.5% and 6.4% reduction for the fixed standing hybrid riser (FSHR) and flexible jumper, respectively; for the THRS when compared to the CHR configuration (with 10-years wave return period). The results also show that there should be appropriate vessel control in order to maintain the best response when in service over 10-year and 100-years extreme conditions. Hence, the Tethered Hybrid Riser System (THRS) yields a significant improvement when compared to the CHR.
VL  - 5
IS  - 1
ER  -

Copy | Download