Flexible risers are crucial pieces of equipment for moving output fluids from wells to platforms during the extraction of oil and gas from deep-sea resources. One of the causes of collapse in these pipes is the high hydrostatic pressure applied to risers in deep water. The innermost layer of a riser, known as the carcass layer, plays a critical role in resistance to external pressure. In this study, we investigated the collapse (nonlinear buckling) of a riser under external pressure, and a novel design based on the structure of a beetle’s exoskeleton was used to increase the load capacity of the carcass layer. This type of beetle skeleton is constructed in such a way that it creates strong connections among the various parts of the external skeleton to considerably enhance strength against external pressure while allowing necessary movements. To assess the performance of the design in comparison with the original design, we examined the nonlinear buckling of the new structure under external pressure. Through genetic algorithm optimization, design parameters were obtained, and the maximum strength before collapse was determined. Results show that the critical pressure in the new design substantially increases relative to that in the original design.
| [1] |
American Petroleum Institute. Recommended Practice for Flexible Pipe. 2014, Washington, American Petroleum InstituteAPI RP 17B
|
| [2] |
Bai Y, Bai Q. Subsea system engineering. Subsea Engineering Handbook. 2019, Amsterdam, Elsevier: 299313
|
| [3] |
Clevelario JA, Pires F, Falcao G, Tan Z, Lu J, Sheldrake TH. Special session: advances in flexible riser technology: flexible pipe curved collapse behavior assessment for ultra deep water developments for the Brazilian pre-salt area. Offshore Technology Conference. 2010OTC-20636-MS
|
| [4] |
Dionicio-Bravo S, Cuamatzi-Meléndez R, Ruiz-Mendoza A, Juárez-López F (2023) Finite element modelling and theoretical analysis of flexible risers subjected to installation/crushing loads. Ocean Engineering 272. https://doi.org/10.1016/j.oceaneng.2023.113856
|
| [5] |
Drumond GP, Pasqualino IP, Pinheiro BC, Estefen SF. Pipelines, risers and umbilicals failures: A literature review. Ocean Engineering. 2018, 148: 412-425
|
| [6] |
Duan M, Zhang Y, Jia Z. Design of pipelines and risers. 2022, Singapore, Singapore: Springer Nature: 319327
|
| [7] |
Ha H. An overview of advances in flexible riser and flowline technology. 4th Offshore Convention Myanmar; 2H Offshore: Yangon. 2016
|
| [8] |
Hu B, Wang Z, Du H, Carriveau R, Ting DSK, Xiong W, Wang Z. Response characteristics of flexible risers in offshore compressed air energy storage systems. Journal of Marine Science and Application. 2019, 18: 353-365
|
| [9] |
Ju X, Fang W, Yin H, Jiang Y. Stress analysis of the subsea dynamic riser base process piping. Journal of Marine Science and Application. 2014, 13: 327-332
|
| [10] |
Li X, Jiang X, Hopman H. Predicting the wet collapse pressure for flexible risers with initial ovalization and gap: An analytical solution. Marine Structures. 2020, 71: 102732
|
| [11] |
Li X, Jiang X, Hopman H. Curvature effect on wet collapse behaviours of flexible risers subjected to hydro-static pressure. Ships and Offshore Structures. 2020, 17: 619-631
|
| [12] |
Pinto CA, Gomes M. Finite element analysis of flexible pipes: Bending combined with tensile load. 2017
|
| [13] |
Rivera J, Hosseini MS, Restrepo D, Murata S, Vasile D, Parkinson DY, Barnard HS, Arakaki A, Zavattieri P, Kisailus D. Toughening mechanisms of the elytra of the diabolical ironclad beetle. Nature. 2020, 586: 543-548
|
| [14] |
Rosas MAP, Souza APF, Rodrigues M V, da Silva DML. Hydrostatic collapse pressure and radial collapse force comparisons for ultra-deepwater pipelines. ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. 2014, San Francisco, ASMEVolume 6B: Pipeline and Riser Technology
|
| [15] |
Shen Y, Jukes P. Technical challenges of unbonded flexible risers in HPHT and deepwater operations. Proceedings of the twenty-fifth (2015) International Offshore and Polar Engineering Conference. 2015, Hawaii, International Society of Offshore and Polar Engineers (ISOPE): 343
|
| [16] |
Simonsen A. Inspection and monitoring techniques for unbonded flexible risers and pipelines. 2014, Norway, University of Stavanger
|
| [17] |
Souza A P F D, Estefen S F, Vaz M A, Alves T M. Flexible pipes collapse under external pressure; Colapso de dutos flexiveis sob pressao externa. Boletim Tecnico da Petrobras Cenpes. 2000, 43(3–4): 141-152
|
| [18] |
Webster WC, Kang Z, Liang W, Kang Y, Sun L. Bundled hybrid offset riser global strength analysis. Journal of Marine Science and Application. 2011, 10: 465-470
|
RIGHTS & PERMISSIONS
Harbin Engineering University and Springer-Verlag GmbH Germany, part of Springer Nature
PDF
