Material selection for CCS injection well: A case study for onshore storage in California

Paper ID: C2025-00273 ABSTRACT: Carbon Capture and Storage (CCS) is acknowledged as a key technology to prevent large amounts of greenhouse gas emissions and contribute to global warming reduction targets. For long-term storage, CO2 is captured from industrial sources, purified and sequestrated into geological reservoirs. However, the impurities (H2S, O2, CO, NO2 and SO2) frequently present in the injected CO2 stream, may compromise the storage integrity.
In dense phase CO2, presence of those impurities can reduce water solubility. This possible water drop out can lead to chemical reactions leading to carbonic and other strong acids formation triggering either general or local corrosion mechanism.
This paper describes the testing methodology implemented to duplicate potential corrosion environment which can be faced during CO2 injection operations. Stress Corrosion Cracking (SCC) and Crevice corrosion resistance of 13Cr and 25Cr (UNS S32760) steels were assessed in a CO2 stream with high impurity levels at high pressure and temperature.