Effect Of Oxygen Concentrations on Localized Corrosion of Martensitic And Super Martensitic Stainless Steels

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It has become somewhat common in the oil and gas industry to convert producing wells containing 13Cr stainless steels to water injection wells. This practice has led to numerous tubing failures due to pitting of the 13Cr from oxygen dissolved in the injection water. The water source for these wells is often from produced water and seawater but other waters may also be injected.

Product Number: 51323-18891-SG

Author: Suresh Divi, Bruce Craig

Publication Date: 2023

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Martensitic stainless steel material, 13Cr (UNS 42000) and Super S13Cr-6Ni-2Mo (UNS S41426), tubing is used in producing oil and gas wells due to their corrosion resistance compared to low alloy steels. However, the industry is often anxious to turn these producing wells around for seawater injection or saltwater disposal in which case the presence of oxygen must be considered which significantly influences the corrosion behavior. The risk for localized corrosion (i.e., pitting and crevice corrosion) in highly concentrated chloride environments is dependent on the dissolved oxygen level, temperature, and chloride content. A laboratory study was performed for 13Cr and S13Cr materials in high chloride water at various dissolved oxygen concentrations at specific temperatures based on OLI modeling. Based on the test results, 13Cr is susceptible to localized corrosion with dissolved oxygen in 10-100 ppb range. No such localized corrosion was observed for S13Cr material.