The fatigue performance of fracture-critical production lines, such as risers and flowlines, has been shown to significantly degrade in the presence of sour hydrocarbon production caused by water injection of reservoirs. To ensure the reliability of the fatigue design under such conditions, experimental verification of the degradation effect on fatigue life due the presence of H2S is required. To that end and over the past several years, ExxonMobil has developed new testing methodologies to evaluate the riser fatigue performance for both in-air and sour conditions. This paper reviews the general elements of the fatigue qualification process and presents new sour fatigue data aimed at assessing performance at the high-cycle fatigue (HCF) and low-cycle fatigue (LCF) regimes. These new data are relevant to that seen in steel catenary riser (SCR) and flowline thermal responses, respectively. Testing methodologies for each regime are discussed and results presented. The new data are interpreted within the context of previous data in the intermediate-cycle fatigue (ICF) to provide a more robust basis for riser design. The main finding is that the new data support a constant slope S-N curve for the practical domain of fatigue lives to which offshore lines are typically designed under sour conditions.
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ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
June 15–20, 2008
Estoril, Portugal
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4822-7
PROCEEDINGS PAPER
High-Cycle and Low-Cycle Fatigue Resistance of Girth Welds in Sour Service
Jaime Buitrago,
Jaime Buitrago
ExxonMobil Upstream Research Company, Houston, TX
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Stephen Hudak,
Stephen Hudak
Southwest Research Institute, San Antonio, TX
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David Baxter
David Baxter
TWI Ltd., Cambridge, England, UK
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Jaime Buitrago
ExxonMobil Upstream Research Company, Houston, TX
Stephen Hudak
Southwest Research Institute, San Antonio, TX
David Baxter
TWI Ltd., Cambridge, England, UK
Paper No:
OMAE2008-57545, pp. 365-372; 8 pages
Published Online:
July 27, 2009
Citation
Buitrago, J, Hudak, S, & Baxter, D. "High-Cycle and Low-Cycle Fatigue Resistance of Girth Welds in Sour Service." Proceedings of the ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. Volume 5: Materials Technology; CFD and VIV. Estoril, Portugal. June 15–20, 2008. pp. 365-372. ASME. https://doi.org/10.1115/OMAE2008-57545
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