Abstract
With conventional oil and gas reserves dwindling, the oil and gas industry is transitioning to more aggressive environments, many rich in hydrogen sulfide, carbon dioxide, chlorides, and elemental sulfur at elevated temperatures and total pressures. Under these conditions, the management of environmentally assisted cracking becomes one of the main challenges, especially during the materials selection process, which is guided by the use of industry standards such as NACE MR0175/ISO15156. Environmentally assisted cracking (EAC) is a common cause of failure during oil and gas production, especially for intermediate sour service conditions, or when the requirements of NACE MR0175/ISO15156 are not fully addressed during design. This chapter describes the EAC mechanisms encountered in oil and gas production and the performance of low grade and corrosion resistant alloys. Standards and recommended practices for materials selection and design are also discussed.
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