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Configuration of Steel Catenary Risers for the Caspian Sea Deepwater Environment

Ghorbanzadeh, Mohammad | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48393 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Golafshani, Ali Akbar
  7. Abstract:
  8. Marine risers are tubular components, which are used to transfer fluids between seabed and floating platform. They may have a great share in cost of oil and gas production systems. One of the risers used in deep-water, is Steel Catenary Riser which is an economic alternative. However, amongst issues in designing this type of risers, high stress level in floating platform connection point and seabed touch- down zone is notable which is created due to platform movements, currents and wave loading and finally, leads to fatigue life reduction. Using buoyancy modules which are attached to risers is one of stress levels reduction solutions in hotspot points. In this study, considering the Caspian Sea environmental conditions, different arrangement of these modules are examined, by using the OrcaFlex software. These arrangement are based on changes in buoyancy forces, buoys length and their installation Location on risers which are very important in their effectiveness. Possibility of change in pipe section has also investigated that has led to improve the fatigue behavior of the riser. Moreover, considering that this type of risers modeling has its own complexity, multiple linear regression model is proposed to estimate forces, by using simple analytical relations which gives good approximation of actual results
  9. Keywords:
  10. Floating Platform ; Fatigue Analysis ; Buoyancy Parameter ; Multiple Linear Regression Analysis ; Caspian Sea ; Steel Catenary Riser

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