Casing Steel Corrosion in H₂S/CO₂-contained Gas Field and Its Protection Technology

This paper introduces the latest research achievements on the corrosion of H₂S/CO₂-contained gas field in recent years athome and abroad, describes corrosion conceptions and features in H₂S/CO₂-contained gas field and lists 4 types of corrosions commonly produced in casing steel in H₂S/SO^2- contained gas field, including weight loss corrosion, sulfide stress cracking (SSC), hydrogen induced cracking (HIC) and stress corrosion crack (SCC), and analyzes main influencing factors on thecorrosions. It is pointed out that the corrosion of casing steel in H₂S/CO₂-contained gas field is a kind of comprehensive corrosion resulted in multiple corrosive mediums, and strong interaction between multiple factors makes corrosion mechanism and the process of the high-sulfur content in the H₂S/CO₂-contained gas field quite complicated under the condition of high-temperature andhigh-pressure environment. Some anti-corrosion measures with developing prospect are proposed in the paper.