Apresentação de Trabalho
Título: "Study of Localized Crevice Corrosion of Super Martensitic and Duplex Stainless Steels Exposed to Typical Environments of Reinjection Water for Injection Wells"
Data: 06/03/2024
Horário: 14:25h
Resumo: Water reinjection wells improve the oil recovery and normally consist of tubing made mainly in SDSS with a minimum PREN of 40. Experimental data have supported the susceptibility of these steels to localized corrosion, with dissolved O2 content (DOC), salinity, temperature and pH as main factors for the corrosion process. A study was carried out exposing SMSS, DSS and SDSS to seawater (DOC: 500ppb; Cl-: 24.000ppm) and produced water (DOC: 10/50ppb; Cl-: 165.000ppm) for 15 days. The samples were assembled simulating a crevice condition between similar (steel/steel) and dissimilar (steel/Inconel 718) materials and were immersed in the corrosive environment saturated with specific gas mixture in autoclaves. The results indicated that dissimilarity promotes the highest incidence of crevice corrosion regardless of the DOC. Produced water favored crevice corrosion compared to seawater. Despite the reduction of DOC, the increase in chloride, H2S and organic acid, and the pH reduction in the produced water intensified crevice corrosion susceptibility.
