Today more deep water, high pressure high temperature (HPHT) wells are being drilled and completed in the presence of Hydrogen Sulfide (H2S), requiring an ever increasing volume of high strength ( >=110 ksi ) sour service-rated tubulars. As this trend moved forward, suppliers overcame critical metallurgy challenges to improve the original offer in 110 ksi sour service materials, extending production toward thicker products and developing dedicated products such as 110 ksi for mild sour use, or thick DST strings used in extreme HPHT wells. These metallurgy improvements also paved the way to develop 125 ksi mild sour service grades. Based on these latest enhancements, and taking the traditional API grades as historical reference, the objective of this paper is to discuss various high strength sour service tubulars, their relative applicability in well conditions, basic manufacturing techniques to optimize tubular as well as the NACE testing performed to characterize the different sulfide stress cracking properties.

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