Material Selection for CCS Injection Well: A Case Study for Onshore Storage in California

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 originating from anthropogenic sources may compromise the storage integrity if not managed appropriately. In dense phase CO2, presence of those impurities can reduce water solubility. This possible water drop out can lead to chemical reactions resulting in the formation of carbonic acid and other strong acids which can lead to either general or local corrosion mechanisms. This paper describes the testing methodology implemented to replicate the corrosiveness of the environment during CO2 injection operations. Stress Corrosion Cracking (SCC) and crevice corrosion resistance of 13Cr and 25Cr SDSS (Super Duplex Stainless Steel, UNS S32760) steels were assessed in a CO2 stream with high impurity levels at high pressure and temperature.