Oil Country Tubular Goods (OCTG) Pipes
Tubing specifications: 8-1240 × 1-200mm
The outer diameter of the tubing is typically 60.3 mm to 114.3 mm.
Tubingend processing are: no thickening with thread and coupling, plus thickwith thread and coupling, flat end, no thickening with thread andcoupling, plus thick with thread and coupling.
API SPEC 5CT - American Petroleum Institute Standard
Pipe and tubing for oil and gas wells in oil and gas industry - SYT 6194-2003
Into the well, used as a liquid or liquid injection pipe
Steel pipe grades
J55, K55, N80, L80, P110 and so on
Unfinished tubing (NU), thicker tubing (EU), integral joint tubing (IJ)