J55 Tubing

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Description

Tubing is the conduit used to transport crude Oil or natural gas from the producing formations to the field surface facilities for processing after drilling is completed. During the extraction process, the OCTG tubing must withstand the pressure and it must be adequately strong to resist loads and deformations associated with production and workovers. In addition, tubing generally is sized to satisfy the expected rates of production of oil and gas. That is because if tubing is too large, we will have an economic impact beyond the cost of tubing oil and gas itself, however, if  API tubing is too small, it will restrict the production of oil or gas, and if things continue this way it will impact subsequent economic performance of the well. Generally, tubing is manufactured in the same way as casing, except an additional process known as “upsetting” which is applied to thicken the Pipes.

specifications of OCTG tubing

Dimension range (OD inch): 1-1/2”—-4 1/2”
Dimension range (OD mm): 26.67—-114.3
Type of upset: NUE, EUE, Plain end.
standard: API SPEC 5CT
Main steel grade: H40, J55, N80, N80Q, L80, L80-1, L80-9Cr, L80-13Cr, P110 etc.
Type of Casing:

  • non-upset tubing(NU)
  • external upset tubing(EU)
  • integral tubing(IJ)

Mechanical Properties:

Tensile and Hardness Requirements
Grade     Yield Strength MPa Tensile Strength Hardness a,c Specified Wall thickness Allowable Hardness Variation b
Type Total Elongation Under Load min MPa max
min max HRC HBW mm HRC
1 2 3 4 5 6 7 8 9 10
H40 0.5 276 552 414
J55 0.5 379 552 517
K55 0.5 379 552 655
N80 1 0.5 552 758 689
N80 Q 0.5 552 758 689
R95 0.5 655 758 724
L80 L80 1 0.5 552 655 655 23 241
L80 9Cr 13Cr 0.5 552 655 655 23 241
0.5 552 655 655 23 241
C90 1 0.5 621 724 689 25.4 255 £12.70 3
12.71 to 19.04 4
19.05 to 25.39 5
³ 25.40 6
T95 1 0.5 655 758 724 25.4 255 £12.70 3
12.71 to 19.04 4
19.05 to 25.39 5
³ 25.40 6
C110 0.7 758 828 793 30 286 £12.70 3
12.71 to 19.04 4
19.05 to 25.39 5
³ 25.40 6
P110 0.6 758 965 862
Q125 1 0.65 862 1034 931 b £12.70 3
12.71 to 19.04 19.05 4
5
a In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method.
b No hardness limits are specified, but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9.
c For through-wall hardness tests of grades L80 (all types), C90, T95 and C110, the requirements stated in HRC scale are for maximum mean hardness number.