Tubing with Threaded Non-Upset/Upset End and Coupling

Upsetting is a forging process that makes for a thicker wall on the tube ends.

Tubing with Threaded Non Upset
Dimensions Steel Requirements Note Another tubing
Standard: API Spec 5 CT


Weight,  (T & C)

W.T .

Steel grade

Non Upset Upset in mm H40 J55 N80 L80 P110
lb/ft kg/m lb/ft kg/m
2 3/8 60,33 4,6 6,84 4,7 7 0,19 4,83 N;U N;U N;U N;U N;U
  - 5,8 8,63 5,95 8,78 0,254 6,45 - - N;U N;U N;U
2 7/8 73,03 6,4 9,52 6,5 9,67 0,217 5,51 N;U N;U N;U N;U N;U
  - 7,8 11,6 7,9 11,75 0,276 7,01 - - N;U N;U N;U
  - 8,6 12,8 8,7 12,94 0,308 7,82 - - N;U N;U N;U
3 1/2 88,9 7,7 11,46 - - 0,216 5,49 N N N N -
  - 9,2 13,69 9,3 13,84 0,254 6,45 N;U N;U N;U N;U N;U
  - 10,2 15,18 - - 0,289 7,34 N N N N N
  - 12,7 18,9 12,95 19,27 0,375 9,52 - - N;U N;U N;U
4 101,6 9,5 14,13 - - 0,226 5,74 N N N N -
  - - - 11 16,37 0,262 6,65 U U U U -
4 1/2 114,3 12,6 18,75 12,75 18,97 0,271 6,88 N;U N;U N;U N;U -


Weight per unit calculation formula:

Non Upset Threaded End
Steel Requirements:
Steel grade

Chemical req uirements

Mech anical requirements

C Mn Ni Cu P S Si Tensile strength Yield limit Elongation A min.
max. max. max. max. max. max. max. Rp0.2
(%) (%) (%) (%) (%) (%) (%) N/mm2 N/mm2 (%)

- - - 0,03 0,03 - min.414 276-552 calculation
J55 - - - - 0,03 0,03 - min.517 379-552 according
N80 - - - - 0,03 0,03 - min.689 552-758 to the wall
L80 0,43 1,9 0,25 0,35 0,03 0,03 0,45 min.655 552-655 thickness
P110 - - - - 0,03 0,03 - min.724 655-758  






What’s The Difference Between Upset Tubing And Non-Upset Tubing?

APT 5CT specified the requirements of Casing and tubing for the purpose of oil or gas production, must be cased with material with sufficient strength and functionality.

Oil tubing are the main parts of the well drilled construction. They are selected for the specific conditions anticipated in a given well. The anticipated production flow rates and economics of the well determine tubing size, which then determines the necessary size of each previous hole and tubular.

Upsetting is a forging process that makes for a thicker wall on the tube ends. Upset Tubing (EUE) is a long tubing with joint installed in a well bore to facilitate the extraction of oil and gas. The tubing joints are designed to suit a certain well type, based on the underground conditions and fluids.It acts as a conduit, through which the produced fluids or gas get transmitted from the bottom to the surface.

Tubing joint is relatively a single length pipe that can vary in length anywhere from 25 to 30 ft. This ideal length allows easy production as the tubing joint is fitted with threads on both sides and can run down through a well of any depth.

There may be the same material and grades with upsetting tubing and non-upset tubing.The maximum difference between them are the tube end, that is outer diameter.

Non-upset tubing refers to the pipe end without the extra thick and straight thread and collar. Non-upset (NUE) tubing is used much less than EUE tubing. The cost of NUE is only slightly less than EUE, and the joint strength is substantially less.

The coupling joint diameter of NUE is less than EUE, which offers some advantages when clearance is small. API NUE joints are available in sizes of 1.050 to 4.500 in.

Once the tubular size and setting depths are determined, the wall thickness and grade of material are then chosen by the well designer to ensure the strength is adequate for the expected loads. API 5CT developed specifications for three different connectors for use as casing tubing joints: External-upset tubing and coupling (Upset tubing),Non-upset tubing and couplings,Integral-joint tubing.

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