OIL COUNTRY TUBULAR GOODS (OCTG) are a family of seamlessly rolled products consisting of drill pipes, casing and tubing subjected to loading conditions according to their specific application.
- STC (short round casing thread)
- LTC (length of casing thread loop)
- BTC (supports casing thread)
- XL (extreme-line casing)
- NUE (non-tempered tube)
- EUE (tempered external tube)
- I J (integral tubing joint)
- Premium Connections
- And almost any premium & gas tight connection
Specifications of oil well casing
various dimensions (OD inch): 4 1/2 "—30"
various dimensions (mm OD) ： 114.3—762
Standard: API SPEC 5CT
Main Steel grade: H40, J55, K55, N80, N80, L80, T95, P110 etc