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OCTG tubing

Anson 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.

OCTG tubing figure

In our company Anson, outside diameter of tubing is from 1.660” to 4 1/2” (42.16mm to 114.3mm); wall thickness is from 2.3 PPF to 26.10 PPF (3.57mm to 9.52mm). Based on the standard of API 5CT, ISO11960, GOST, and their steel grade are from H40, J55, N80, N80Q, L80, L80-1, L80-9Cr, L80-13Cr, P110 etc. As you know the length range is R1 (6.10-7.32M), R2 (8.53-9.75M), R3 (11.58-12.8M), R2 is used frequently.

Besides EU and NU end type could be provided by Anson, IJ and premiums thread type are also available.

octg api tube api tubing for oil and gas
tubing for oil gas tubing connnection


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 Tubing: Non-upset tubing (NU), External-upset tubing (EUE), Integrated Joint (IJ).

Mechanical Properties:
Standard Grade Tensile Strength(MPa) Yield Strength(MPa) Elongation(%) Hardness
API SPEC 5CT J55 ≥517 379~552 0.5%  
K55 ≥655 379~552 0.5%  
N80 ≥689 552~758 0.5%  
L80(13Cr) ≥655 552~655 0.5% ≤241HB
P110 ≥862 758~965 0.6%  

Chemical Composition:
Standard Grade Composition(%)
C Si Mn P S Cr Ni Cu Mo V AIs
API SPEC 5CT
 
J55K55 0.34~0.39 0.20~
0.35
1.25~1.50 ≤0.020 ≤0.015 ≤0.15 ≤0.20 ≤0.20     ≤0.020
(37Mn5)
N80 0.34~0.38 0.20~
0.35
1.45~1.70 ≤0.020 ≤0.015 ≤0.15       0.11
~0.16
≤0.020
(36 Mn2V)
L80(13Cr) 0.15~0.22 ≤1.00 0.25~1.00 ≤0.020 ≤0.010 12.0~
14.0
≤0.20 ≤0.20     ≤0.020
P110 0.26~0.35 0.17~
0.37
0.40~0.70 ≤0.020 ≤0.010 0.80~
1.10
≤0.20 ≤0.20 0.15
~0.25
≤0.08 ≤0.020
(30CrMo)

Outside Diameter Wall Thickness Weight Grade and Upset Type*
Non-Upset T&C External Upset T&C
(In.) (mm) (In.) (mm) (lb/ft) (kg/m) (lb/ft) (kg/m) J55 L80 N80 C90 P110
2-3/8 60.32 0.167 4.24 4.00 5.95 - - PN PN PN PN -
0.190 4.83 4.60 6.85 4.70 6.99 PNU PNU PNU PNU PNU
0.254 6.45 5.80 8.63 5.95 8.85 - PNU PNU PNU PNU
0.336 8.53 7.35 10.94 7.45 11.09 PU - PU PU -
2-7/8 73.02 0.217 5.51 6.40 9.52 6.50 9.67 PNU PNU PNU PNU PNU
0.276 7.01 7.80 11.61 7.90 11.76 - PNU PNU PNU PNU
0.308 7.82 8.60 12.80 8.70 12.95 - PNU PNU PNU PNU
0.340 8.64 9.35 13.91 9.45 14.06 - PU - PU -
0.440 11.18 11.50 17.11 - - N PN - PN -
3-1/2 88.90 0.216 5.49 7.70 11.46 - - PN PN PN PN -
0.254 6.45 9.20 13.69 9.30 13.84 - PNU PNU PNU PNU
0.289 7.34 10.20 15.19 - - PN PN PN PN -
0.375 9.52 12.70 18.91 12.95 19.27 - PNU PNU PNU PNU
4 101.60 0.226 5.74 9.50 14.14 - - PN PN PN PN -
0.262 6.65 - - 11.00 16.37 PU PU PU PU -
4-1/2 114.30 0.271 6.88 12.60 18.75 12.75 18.97 PNU PNU PNU PNU -
*  P - plain end, N - non-upset, U - external upset.

Oil Tubing productive process:


Ingot heating for tubing oil and gas Hot rolling of oil octg tubing
Ingot heating Hot rolling
Sizing for api octg tube Plug mill of api oil tubing
Sizing Plug mill
api tube cooling OCTG oil tube water cooling
Cooling Cooling
Straightening of octg tube NDT for api oil tubing
Straightening NDT
Hydraulic test of octg tubing Packing of octg tubing
Hydraulic test Packing

Quality assurance of tubing oil and gas

With API 5CT and ISO 9001 certificated, we have got no claims from buyer up to now. Mill of Anson has pipe testing laboratory and the ability to test the samples. It can do experiment for stretching(low and high temperature), impacting, rigidity(HB, HRC, HV, HL), fatigue, fracture mechanism, falling weight, metallurgical, stress corrosion and compounds analysis etc. The testing laboratory has already been acknowledged by CNAS.
tubing quality control machine tubing quality control facility

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