The Production and Fit-For-Service Testing and Field Useage of C-110 Available to Purchase

The use of sour service tubulars has come a long way since the sour service casing and tubing grades C90 and T95 were first standardized by the American Petroleum Institute (API)¹ . As the search for oil and gas reservoirs is expanding, it is becoming common practice to drill and produce from formations at depths in excess of 20,000 feet. In deep offshore wells, water depths of 10,000 feet are an every day phenomena. Significant colder seawater temperature resulting from the water depth, further promotes the deleterious attack of hydrogen. At these deeper formation depths, high formation pressures and gas compositions are encountered which require tubulars to not only have high yield strength, but also satisfactory resistance to environmental cracking by hydrogen sulfide stress cracking (SSC). This cracking phenomenon is a result of the exposure of high strength steels to aqueous hydrogen sulfide containing fluids, which induces a brittle-like failure. As the depths of drilling, completing and producing increase, even higher yield strength pipe with adequate SSC resistance is needed to sustain the higher stresses and colder temperatures encountered offshore. The casing design envelope is greatly affected by the relationship between pressure and H₂S (ppm) concentration.