Oil Country Tubular Goods commonly include casing, tubing and drill pipe. Each product performs a different function and must be selected against its own product standard, dimensions, loads, connection system and service environment.
- Drill pipe transmits torque, axial load and drilling fluid
- Casing supports and isolates the wellbore
- Tubing provides the production or injection conduit
Strength is important, but it is not the only selection criterion. Grade, heat treatment, toughness, hardness and environmental resistance should be reviewed against pressure, temperature, loads and fluid chemistry.
A complete line item states outside diameter, nominal mass or wall thickness, length range, end condition and connection. Buyers should also define material certificates, NDT, pressure testing, dimensional inspection and traceability.
A technically comparable quotation should disclose deviations, manufacturing route, inspection scope, documentation, delivery schedule and commercial exclusions.