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Tension Loss of Hydro-Pneumatic Riser Tensioners

[+] Author Affiliations
Songcheng Li, Mike Campbell, John Orsak

2H Offshore Inc., Houston, TX

Hugh Howells

2H Offshore Ltd., London, UK

Paper No. OMAE2013-10090, pp. V04AT04A008; 8 pages
doi:10.1115/OMAE2013-10090
From:
  • ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 4A: Pipeline and Riser Technology
  • Nantes, France, June 9–14, 2013
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5536-2
  • Copyright © 2013 by ASME

abstract

With drilling exploration extending to deeper water, the total top tension to lift a drilling riser increases accordingly. Tensioners with higher tension capacity are preferred to minimize the total number of tensioners due to space limitation on a drilling vessel. Higher tension capacity requires more advanced recoil control for emergency events. Hydro-pneumatic tensioners are widely used for risers with anti-recoil control in deep water, and are commonly simulated as an equivalent linear or nonlinear spring or a pneumatic system. The discrepancy between simulation and measurement calls for a model with rate dependent stiffness considering the compressibility of hydraulic oil, the interference of valve control and friction loss along piping or hose.

In this paper, the hydro-pneumatic tensioner system with anti-recoil valve control is simulated in 2HRecoil, a customized version of ANSYS Mechanical APDL, and benchmarked with commercial software DeepRiser. The tension loss due to hydraulic oil friction, mass inertia, piston-cylinder friction is evaluated with coupled riser motion. The conventional approach in simulating the hydro-pneumatic tensioner system as an equivalent pneumatic system is found inaccurate. The sensitivity of the pressure difference between the cylinder chamber and the high pressure accumulator on the gas constant is discussed. The scatter in predicting gas constant, friction and damping coefficients from measured data is explained using hydro-pneumatic approach.

Copyright © 2013 by ASME

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