OCTG refers mainly to well casing and tubing — items subject to extreme stress in today's oil and gas industry. Continental began its existence specializing in OCTG, and remains a leader in understanding the needs of the drilling and completion sector.
Oil country tubular goods can be either seamless (hot-pierced) or seam-welded. The seamed, electric-resistance-welded material costs less than seamless, and is available in almost every American Petroleum Institute grade. The ERW process uses both heat and pressure to create a true forged weld. Some end users, however, feel the weld represents a liability — and for critical applications such as offshore extraction, seamless is preferred. See API Specification 5CT for Casing and Tubing for a complete description of sizes, grades and performance properties of OCTG.
For complete details on grades within this material category, including chemical composition, mechanical properties and available size ranges:
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