Session: Advances in Materials for Oil and Gas Production (Part II of III)
Methodologies for CO2 stress corrosion cracking testing of carbon steel armor wires for flexible pipes (C2026-00264)
Tuesday, March 17, 2026
8:00 AM - 8:30 AM Central
Location: 362 DE
Earn .5 PDH
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Attalian Mandebvu, Jonas Gudme, VISWESWARA Gudla, Mamadou Koné, Peter Søe Nielsen, Saber Haratian
CO₂ stress corrosion cracking (CO₂-SCC) of carbon steel armour wires in flexible pipes poses significant concerns for oil and gas operations. Small-scale and full-scale tests have been developed to better understand and mitigate CO₂-SCC. However, reproducing this phenomenon in laboratories is challenging due to the highly confined environment of the flexible pipe annulus. CO₂-SCC in flexible pipes results from the interplay of environmental factors, stresses, and material characteristics. In laboratory investigations, while material composition/microstructure remains constant, variables such as static, dynamic, or continuous loading, manufacturing induced plastic deformation, and environmental conditions are examined for their impact on CO₂-SCC. This work focuses on static loading employing four-point bend and U-bend configurations to introduce different stress distributions in test samples. Furthermore, the effect of accumulated plastic strain is studied by pre-straining samples in both bending and uniaxial modes. Environmental parameters, including test solution Fe²⁺ saturation, surface corrosion, oxygen contamination, confinement level, and exposure duration are systematically investigated. The study ultimately compares these test methodologies, evaluating both their effectiveness in qualifying materials for resistance to CO₂-SCC and simulating flexible pipe annulus conditions. The results further elucidate how various mechanical and environmental factors contribute to CO₂-SCC susceptibility, providing insights for improving material testing practices.
