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Test Protocol for Assessing the Sulfide Stress Cracking Resistance of Low Alloyed Steels in High Temperature High Pressure Sour Environments

Picture for Test Protocol for Assessing the Sulfide Stress Cracking Resistance of Low Alloyed Steels in High Temperature High Pressure Sour Environments
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High Pressure and High Temperature wells are very critical and require special attention to avoid well integrity issues. High pressure requests the use of very high strength low alloyed steels, above 965 MPa (140 ksi), while even trace of hydrogen sulfide implies significant partial pressures of H2S, much higher than the limit of 0.05 psi (3.5 mbar) provided by NACE MR0175 / ISO 15156 standard. Consequently, and despite a high temperature that reduces the risk of cracking, it is crucial to assess the resistance to Sulfide Stress Cracking of materials. However low alloyed steels experience high corrosion rates when exposed to standardized test solutions at elevated temperatures, leading to difficulties of controlling the mechanical stress loading, with a load rising in NACE TM0177 Method A and declining in four-points bending test. In addition, close attention shall be paid to both the evolution of the mechanical properties of the materials with the temperature and the appropriate sequence of sour gas introduction with regards to the temperature control. This paper discusses the most appropriate testing protocol for overcoming these issues and provides experimental results obtained in the frame of the qualification of 965 MPa (140 ksi) controlled yield grade for HPHT applications. 

Product Number: 51320-14588-SG
Author: Florian Thebault, Jonathas Oliveira, Julien Millet
Publication Date: 2020
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Author: James Wei / Manuel Gonzalez / Brian Chambers / Boris Thomas
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There is an increasing need to define the operating envelope for materials typically used as oil country tubular goods. This paper reports results of sulfide stress cracking (SSC) tests that were performed in mild sour environment at temperatures below 107°C.
Picture for 08115 Development of a C125 High Strength Low Alloy Steel for OCTG: SSC Mapping in Slightly Sour Environment
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08115 Development of a C125 High Strength Low Alloy Steel for OCTG: SSC Mapping in Slightly Sour Environment

Product Number: 51300-08115-SG
ISBN: 08115 2008 CP
Author: Hervé Marchebois / Michel Piette / Laurent Ladeuille / David Senegas-Rouviere /Christoph Bosch / Josef Pleschiutschnig / Jean Leyer / Bertine Orlans-Joliet / Etienne Lepine / Frédéric Legay / Cédric Linne / Alfredo Figueiredo
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Today a need for a C125 Sulfide Stress Cracking (SSC) resistant material exists with the development of High Pressure/High Temperature (HP/HT) oil and gas fields.  This paper focuses on the SS resistance of industrial heats.
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06127 EFFECT OF TESTING TEMPERATURE ON SSC PROPERTIES OF LOW ALLOY STEEL

Product Number: 51300-06127-SG
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