Open Access Open Access  Restricted Access Subscription or Fee Access

Nonlinear Three Dimensional Dynamic Analysis of Titanium Drilling Riser

Rizwan A Khan, Abhishek Khandelwal, Suhail Ahmad

Abstract


Abstract

Titanium alloys are selected for a high-pressure drilling riser’s application due to its high specific strength, corrosion resistance, and favorable elastic properties. The qualification of this titanium alloy requires assessing its resistance to hydrogen embrittlement and stress corrosion cracking due to seawater with/without cathodic protection, evaluating its dynamic response under long crested random sea. The response analysis is based on a simulation technique which duly considers the various nonlinear effects such as relative velocity squared drag force, variable added mass due to variable submergence and nonlinearity due to large excursions. It also accounts for variable tension in riser due to variable submergence, variable buoyancy and wave forces. Results are presented which illustrate the effects of nonlinearities, long term drift oscillations and instantaneous motion due to current velocity on the bending stress in the marine risers. The response time histories are obtained and presented in terms of bending stress envelopes and spectra showing contribution of various harmonics which is significant because of a nonlinear system.

 

Keywords: Titanium, drilling riser, alloys

Cite this Article

Khan Rizwan A, Khandelwal Abhishek, Ahmad Suhail.Nonlinear three dimensional dynamic analysis of titanium drilling riser. Journal of Offshore Structure and Technology. 2015; 2(2): 27–40p.


Full Text:

PDF

References


Cooley JW, Turkey JW. An algorithm for the machine calculation of complex Fourier series. Math. Comput.1965 19: 297–301p.

Luc Huyse, Mansa CS, Marc A Maes. Astatic drilling riser model using free boundary conditions. Ocean Engineering.1997; 24(5): 431–44p.

Atadan AS, Calisal SM, Modi VJ, et al.Analytical and numerical analysis of a marine riser connected to a floating platform. Ocean Engineering.1997; 24(2): 111–31p.

Yousun Li. Dynamic response of marine risers to wave crests loads. OffshoreTechnology Conference (OTC).1999; 1–6p.

Gorynin IV. Titanium alloys for marine application.Materials Science andEngineering.1999; A263: 112–16p.

Schultz R W, Baxter C F, Boster PL,et al. Applying titanium alloys in drilling and offshore production systems. JOM.2001; 53(4): 33–55p.

Bjørset A, Leira BJ, Remseth S, Larsen C,et al. Titanium pipes subjected to bending moment and external pressure. Computers andStructures.2003; 81(30–31): 2691-2704p.

Bjørset A, Leira BJ, Remseth S. Probabilistic analysis of bending moment capacity of titanium pipes. Structural Safety.2004; 26: 241–69p.

Morroka CK, Coelho FM, Ribeiro, et al. Dynamic behavior of a vertical riser and service life reduction. Proc. 24thInternational Conference on Offshore Mechanics and Arctic Engineering, Halkidiki, Greece. 2005; 605–10p.

Kaewunruen S, Chiravatchradrej J, Chucheepsakul S. Nonlinear free vibration of marine risers/pipes transporting fluid. Ocean Engineering. 2005; 32; 417–40p.

Adamus J, Lacki P. Forming of the titanium elements by bending. Computational Materials Science.2011; 50: 1305–09p.

ABAQUS Analysis User’s Manual. Version 6.10.


Refbacks

  • There are currently no refbacks.