Despite the unprecedented growth in the number of carbon capture and storage (CCS) projects, this figure needs to increase to meet global climate objectives. For this to happen, there is a need for corrosion testing of materials to be used in the CO2 injection wells. The present work tested several common corrosion resistant alloys (CRA) for the Acorn CCS project.

The conditions of CO2 injection wells were simulated using two types of testing with dense phase CO2 and the Acorn CO2 specification. The first test type simulated exposure to the CO2/water interface during a shut-in event after CO2 injection, at 80°C and 180 bar. The second test type simulated exposure during a short-term transient shut-in condition where the temperature was reduced to -15°C.

The results showed that the CRAs generally had good corrosion resistance in the tested environments. No cracks were observed but crevice corrosion attacks were commonly observed on nearly all materials. Some CRAs had in addition localised corrosion attacks that were 20 - 50 μm deep.

Subject
Water depth, Water, Materials, Metal coupons, Corrosion cracking, Crevices, Corrosion attacks, Interfaces, Impurities, Ceramics, Corrosion coupons, Localized corrosion, Alloys
Keywords:
CRA, supercritical CO2, CCS
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2023
Association for Materials Protection and Performance (AMPP)
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