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Petroleum and natural gas industries — Materials for use in H2S-containing environments in oil and gas production —
Part 3: Cracking-resistant CRAs (corrosion-resistant alloys) and other alloys
TECHNICAL CIRCULAR 1
Published 2021-12-09
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This paper reviews a theoretical background of buffer solutions for stainless steel oil country tubular goods materials at laboratory corrosion test, and then the concept is applied to NACE-TM0177-based solution and modified solutions.
In the oil and gas industry, the major standard for material selection today is ANSI1/NACE2 MR0175/ISO 15156 Parts 1-3. [1] While this standard deals extensively with environment cracking and its prevention for materials under exposure to production environments containing H2S, CO2, chlorides, and sulfur, it does not include any guidance or material requirements for resistance to environmental cracking (such as hydrogen stress cracking – HSC, or otherwise) under variable subsea conditions that involve exposure to seawater with varying levels of cathodic protection (CP). ISO 21457 [2] provides further guidance for materials selection and corrosion control for oil and gas production systems but does not provide adequate coverage of the issue of environmental cracking in subsea applications with CP.