Corrosion control in CO2/H2S-produced water of offshore oil fields

Purpose – In order to solve the corrosion problems in the South China Sea, the purpose of this paper was to study the main influences of corrosion including temperature, H2S content and corrosion inhibitor content in CO2/H2S oil field-produced water. Design/methodology/approach – The corrosion products formed on the steel surface were observed and analyzed using scanning electron microscope (SEM) and X-ray diffraction (XRD). Findings – The results indicate that temperature significantly influences the corrosion rate, which is a maximum at 70°C. The corrosion rate decreases as H2S content increases which is less than 10 mg/L, but then it increases rapidly. The FeCO3/Fe x S y protective film and a corrosion inhibition also were considered. Research limitations/implications – A mixture containing an imidazoline derivate and an organic amine can enhance the corrosion resistance of the corrosion product film. Practical implications – A mixture containing an imidazoline derivate and an organic amine can enhance...