10314 Environmental Cracking performance of Super Martensitic Stainless Steels "13-5-2" (Grades 110KSI and 125KSI) for Tubing Applications in High Chloride Reservoir Fluids Containing H2S/CO2

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Product Number: 51300-10314-SG

ISBN: 10314 2010 CP

Author: Roberto Morana, Eugenio Lo Piccolo, Lucrezia Scoppio and Perry Ian Nice

Publication Date: 2010

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Within the Oil & Gas industry there is an increasing interest in the use of high strength tubing alloys in deep water, high temperature/high pressure (HPHT) and ultra high pressure wells. “13-5-2” super martensitic stainless steels (ISO13680) grade 110ksi have been developed and typically used in HPHT fields containing CO₂ and small amount of H₂S. The alloy application limits have not been fully defined with respect to parameters such as chloride concentration, pH, temperature and H2S partial pressure. These parameters influence both localized corrosion resistance and Stress Corrosion Cracking (SCC) susceptibility.

The present work has been aimed at evaluating the SCC resistance of alloy “13-5-2” grades 110ksi and 125ksi. This has been performed by means of the Four Point Bent (FPB) testing method according to EFC publication n°17.

SCC-resistance application limits are proposed for both grades as a function of chloride concentration, pH, temperature and H₂S partial pressure.

Key words: Super 13Cr steel, super martensitic stainless steel, SCC, chlorides, pH, H₂S, CO₂