An OCTG enquiry becomes meaningful when the requested product is connected to its role in the well. Surface, intermediate and production casing do not carry the same loads or perform the same isolation duty.
State the string function, anticipated setting depth and available design basis before listing dimensions.
- String function and setting depth
- Operating and installation load basis
- Pressure and temperature envelope
Outside diameter and grade alone do not define casing or tubing. Each line item should identify the governing standard and edition, nominal mass or wall thickness, grade, length range, quantity and end condition.
The connection affects sealing, clearance, make-up, handling and compatibility with couplings, pup joints and completion equipment.
Define material certificates, NDT, dimensional records, thread inspection, third-party participation and the final dossier at enquiry stage.