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Sour Service Limit Of 17% Cr Stainless Steels Grades For OCTG

Picture for Sour Service Limit Of 17% Cr Stainless Steels Grades For OCTG
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Product Number: 51321-16637-SG
Author: Toshiyuki SUNABA/ Susumu HIRANO/ Thiago MESQUITA/ FranceHerve MARCHEBOIS/ Thierry CASSAGNE
Publication Date: 2021
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Recently, the use of 17% Cr seamless steel tubing has been a cost-effective solution for preventing high pressure and high temperature (HP/HT) CO2 corrosion environment with small amount of H2S. This paper focuses on the sulfide stress cracking (SSC) results of 17% Cr stainless steels in simulated conditions for HP/HT gas wells. In the frame of a qualification program, NACEa Standard Tensile Test, Method A was adopted in accordance with NACE TM0177. The influence of partial pressure of H2S was investigated at condensed and formation water conditions where SSC is likely to occur. In addition, a previous work on the localized corrosion and the stress corrosion cracking behavior of those grade is also discussed in this paper. The results were summarized in a sour service domain map and compared with previous published data. The results showed the applicability of this alloy for selected gas well conditions. .

Key words: 17%Cr, OCTG, CO2, H2S, SSC

Recently, the use of 17% Cr seamless steel tubing has been a cost-effective solution for preventing high pressure and high temperature (HP/HT) CO2 corrosion environment with small amount of H2S. This paper focuses on the sulfide stress cracking (SSC) results of 17% Cr stainless steels in simulated conditions for HP/HT gas wells. In the frame of a qualification program, NACEa Standard Tensile Test, Method A was adopted in accordance with NACE TM0177. The influence of partial pressure of H2S was investigated at condensed and formation water conditions where SSC is likely to occur. In addition, a previous work on the localized corrosion and the stress corrosion cracking behavior of those grade is also discussed in this paper. The results were summarized in a sour service domain map and compared with previous published data. The results showed the applicability of this alloy for selected gas well conditions. .

Key words: 17%Cr, OCTG, CO2, H2S, SSC

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