Session: Material Selection and Qualification in CCS Downhole Environment (Part II of II)
CO2 injection wells: Corrosion of CRAs (C2026-00343)
Thursday, March 19, 2026
1:30 PM - 2:00 PM Central
Location: 342 DE
Earn .5 PDH
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CO2 storage will require injection of dense phase CO2 into a suitable reservoir. Due to safety and availability from decades of oil and gas exploration, several projects target subsea reservoirs. It is widely accepted that materials for CO2 injection wells must be chosen among the CRAs, but the exact selection will depend on parameters such as temperature, pressure, salinity, pH and CO2 specification. The current work presents results from corrosion experiments carried out under simulated CCS downhole conditions. A brine with 150 g/kg salt was used, test temperature was 120 °C and the pressure 150 bar. Different CO2 specifications were tested among the impurities H2S, SO2, O2 and NO2. Up to six different alloys were exposed in each test. Crevice formers were applied to all specimens. Coupons were investigated for pitting, general corrosion and crevice corrosion. Results show that super duplex are usually good options for well materials, as long as the CO2 specification is not too oxidizing. Among the austenitic alloys intended for equipment, crevice corrosion may be an issue – in line with the relatively lower critical crevice temperatures found for these materials. Titanium forms clearly visible corrosion films which offers excellent protection against further corrosion.
