High Pressure and High Temperature (HPHT) applications demand OCTG with increasing yield strengths, at least up to 140ksi. Due to the high total pressures, even trace amounts of H2S lead to significant partial pressures of H2S in wells. Consequently, the risk of SSC needs to be adressed. Typical sour conditions in such wells are pH 3.9-4.5 and 0.0035-0.03 bar of H2S. A single steel grade has been designed so as to be suitable for a wide range of tubular products, from casing to thick accessories (up to 2.2 inch). The present paper describes the qualification approach applied to field projects using NACE TM0177 method A and D.

Subject
Environmental cracking, Materials, Piping, Sour environments, Sodium chloride, Tensile tests, Stress cracking, Partial pressures, Test environments, Crack length, Steel, Sulfide stress cracking, Yield strength
Keywords:
HPHT, SSC, OCTG, High Strength
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2022
Association for Materials Protection and Performance (AMPP)
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