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OCTG Casing and Tubing

  • OCTG Tubing
  • OCTG Casing
  • Drilling Pipe

1. OCTG Tubing
N-STEEL supplies all kind of OCTG tubing pipes used for transporting crude oil and natural gas from the hydrocarbon reservoir up to earth’s surface after drilling has been completed.

Specifications of OCTG tubing
Standards: API SPEC 5CT
Steel grade: J55/ L80-1/N80/C90/P110
Outside diameter: 2 3/8"- 4 1/2" (60mm-114.3mm)
Type of end finish: P-flush end; N-non-upset; U-external upset; T&C-lathe thread coupling

2. OCTG Casing
Aside from tubing pipes, N-STEEL also provides casing pipes that are mainly used for the pipes on the wall of a well.

Specifications of OCTG Casing
Standard: API SPEC 5CT
Grade: J55/K55/M65/L80/C95/N80-1/N80Q/C90/T95/P110
Outside diameter: 4 1/2 "- 20" (114.3mm - 508mm)
Type of end finish: P-flush end; N-non-upset; U-external upset; T&C-lathe thread coupling

OD, W.T. and Weight Tolerances of OCTG Casing and Tubing
Item Tolerances
Outside Diameter Pipe Body D ≤ 101.6mm ± 0.79mm
D ≥ 114.3mm
(-0.5 %D~+1.0%D)
Coupling ± 1%D
Wall Thickness -12.5%
Weight Single Lengths +6.5%~ -3.5%
Carload Lots≥18144kg
Carload Lots<18144kg
-1.75%
-3.5%

3. Drilling Pipe
Standard: API SPEC 5CT

Specifications of Drilling Pipe
OD Nominal Weight Calculated Weight Grade Wall Thickness Upset End, for Weld-on Tool Joints (see Note)
in mm lb/ft kg/m in mm
2 3/8 " 60.3 6.65 6.26 9.32 E.X.G.S 0.280 7.11 EU
2 7/8 " 73.0 10.40 9.72 14.48 E.X.G.S 0.362 9.19 EU
3 1/2 " 88.9 13.30 12.31 18.34 E.X.G.S 0.368 9.35 EU
3 1/2 " 88.9 15.50 14.63 21.79 E.X.G.S 0.449 11.40 EU
4 " 101.6 14.00 12.93 19.26 E.X.G.S 0.330 8.38 EU
4 1/2 " 114.3 16.60 14.98 22.31 E.X.G.S 0.337 8.56 EU
4 1/2 " 114.3 20.00 18.69 27.84 E.X.G.S 0.430 10.92 EU
5 " 127 19.50 17.93 26.71 E.X.G.S 0.362 9.19 IEU
5 " 127 25.60 24.03 35.79 E.X.G.S 0.500 12.70 IEU
5 1/2 " 139.7 21.90 19.81 29.51 E.X.G.S 0.361 9.17 IEU
5 1/2 " 139.7 24.70 22.54 33.57 E.X.G.S 0.415 10.54 IEU
Size Deviation of Drilling Pipe
Item Tolerances
Pipe Body Outside Diameter D ≤ 101.6mm ± 0.79mm
D ≥ 114.3mm (-0.50%D~+1.00% D)
Wall Thickness -12.5%
Weight Single Lengths -3.5%~+6.5%
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