Session: Material Selection and Qualification in CCS Downhole Environment (Part II of II)
Crevice Corrosion Assessment of OCTG Materials in a Simulated Carbon Capture and Storage (CCS) Environment (C2026-00092)
Thursday, March 19, 2026
1:00 PM - 1:30 PM Central
Location: 342 DE
Earn .5 PDH
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Wenle He, Suresh Divi, Jerry Lindkvist, Jan Andersson, Daniel Gullberg
Material selection for carbon capture and storage (CCS) systems is particularly challenging in environments containing elevated chloride and oxygen levels at moderate temperatures. This study investigates the corrosion resistance of various Oil Country Tubular Goods (OCTG) materials under a simulated CCS well condition: 25 wt.% NaCl, 100 ppb dissolved oxygen, pH 3, 1 bar CO₂, and 40 °C. The materials evaluated include super-duplex stainless steel (UNS S32750), hyper-duplex stainless steel (UNS S33207), and cold-worked nickel-based alloys (UNS N80828, N80829, and N06985). Testing was conducted using cyclic potentiodynamic polarization (CPP) in a small electrochemical cell equipped with crevice assemblies applying a contact pressure of 12 N/mm². Results showed that while all Ni-based alloys exhibited crevice corrosion, the duplex stainless steels remained unaffected. Despite similar CPP curve profiles, duplex steels demonstrated stable passive behavior, whereas Ni-based alloys showed signs of metastable passivity, indicating crevice corrosion initiation. SEM-EDS and 3D interferometry confirmed localized crevice attack on the Ni-based alloys, with corrosion depths ranging from 40 to 80 µm. The study discusses the interactions between material composition, environment and surface conditions, and their influence on crevice corrosion behavior. These findings provide practical insights for selecting corrosion-resistant materials for CCS infrastructure applications.
