Effect of Riser-Seabed Interaction on the Dynamic Behavior of Risers

Document Type: Research Paper

Authors

Petroleum University of Technology

Abstract

In recent years, the production of oil and gas has been developed in deep water depths which exceed 500m. Deep water developments are being followed strongly in different parts of the world (Caspian Sea, Gulf of Mexico, etc.). The movement of floater causes severe stress at the touchdown point (TDP) in steel catenary risers (SCR). The main objective of this study was to simulate the exact behavior of the riser in the vicinity of the touchdown zone (TDZ) by implementing linear SCR-seabed interaction model. Hence, present study attempted to investigate the riser-seabed interaction during lateral cyclic pipe movements and also the influence of seabed evolution around the TDZ based on the vertical cyclic movements. Moreover, The significance of the soil types in the response of riser pipeline at TDP was analyzed based on the vertical and lateral interaction. The fully non-linear time domain finite element model was utilized to simulate the riser behavior.

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[1]       A. Taheri, R. Siahtiri, “Steel Catenary Riser-Seabed Interaction Due to Caspian Sea Environmental Conditions,” Jounal of Rehabilitation in Civil Engineering,  vol. 2, pp. 39–51, 2017.

[2]       API-RP-2RD. “Recommended Practice For Design of Risers for Floating Production Systems’’, USA, 2009.

[3]       C. Bridge, H. Howells, “Observations and modeling of steel catenary riser trenches,”, International Offshore and Polar Engineering Conference, ISOPE, July 1-6, Lisbon, Portugal, pp. 803–813, 2007.

[4]       DNV-OS-F201, “Offshore Standard For Dynamic Risers’’, Norway, 2010.

[5]       C.P. Aubeny, G. Biscontin, “Seafloor-Riser Interaction Model,” International Jounal of Geomechanics, vol. 9, pp. 133–141, 2009.

[6]       L. Wang, K. Li, F. Yuan, “Lateral Cyclic Interaction Between Catenary Riser and Soft Seabed Hinged Joint,” Phys. Procedia, vol. 63, pp. 11–23, 2017.

[7]       R. Hejazi, M. Kimiaei, “Equivalent Linear Soil Stiffness in Fatigue Design of Steel Catenary Risers,” Ocean Eng., vol. 111, pp. 493–507, 2016.

[8]       Y. Bai, “Pipelines and Risers,” Elsevier Ocean Engineering Book Series, 2001.

[9]       X. Bai, W. Huang, M. Augusto, “Riser-Soil Interaction Model Effects on the Dynamic Behavior of a Steel Catenary Riser,” Mar. Struct., vol. 41, pp. 53–76, 2015.

[10]    H. Elosta, S. Huang, A. Incecik, “Dynamic Response of Steel Catenary Riser Using a Seabed Interaction under Random Loads,” Ocean Eng., vol. 69, pp. 34–43, 2013.

[11]    D.A. Wagner, J.D. Murff, “Pipe-soil interaction model,” Offshore Technology Conference, OTC , April 27-30, Houston, Texas, USA, 1987.

[12]    M. Randolph and P. Quiggin, “Non-linear hysteretic seabed model for catenary pipeline contact,” International Conference on Ocean, Offshore and Arctic Engineering, OMAE, Honolulu, Hawaii, USA, 2009.

[13]    H. Shiri, “Response of Steel Catenary Risers on Hysteretic Non-Linear Seabed,” Appl. Ocean Res., vol. 44, pp. 20–28, 2014.

[14]    M.E. McCormick, “Ocean Engineering Mechanics,” First edit. Cambridge University Press, 2010.

[15]           J.H. You, “Numerical Model for Steel Catenary Riser on Seafloor Support, Master’s Thesis,” Offshore Technology Research Center, Texas A&M University, Texas, 2005.