API Steel Tubing list - Knowledge

API 5CT Oil Tubing Classification:‌

‌Plain End Tubing (NU):‌ Pipe ends are directly threaded and fitted with couplings without thickening.

‌Upset End Tubing (EU):‌ Ends are externally upset before threading and coupling attachment.
3 ‌Integral Joint Tubing (IJ):‌ One end is internally upset for external threading, while the other is externally upset for internal threading, directly connecting without couplings.

‌Functions of Oil Tubing:‌

‌Hydrocarbon Extraction:‌ After drilling and cementing, tubing is placed in the casing to extract oil/gas to the surface.

‌Water Injection:‌ When downhole pressure is insufficient, water is injected through tubing.

‌Steam Injection:‌ Insulated tubing delivers steam for heavy oil thermal recovery.

‌Acidizing/Fracturing:‌ In late-stage well operations, acidizing/fracturing fluids or proppants are pumped through tubing to enhance production.

API 5CT tubing

Labels				Outside diameter D mm	Nominal linear masses a, b			Wall thick- ness t mm	Type of end finish c
Labels					Non- upset T&C kg/m	Ext. upset T&C kg/m	Integ. joint kg/m
1	2
1	NU T&C	EU T&C	IJ						H40	J55	L80	N80 Type 1,Q	C90	T95	P110
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16
1.900 1.900 1.900 1.900 1.900	2.40 2.75 3.65 4.42 5.15	- 2.90 3.73 - -	2.40 2.76 - - -	48,26 48,26 48,26 48,26 48,26	- 4,09 5,43 6,58 7,66	- 4,32 5,55 - -	3,57 4,11 - - -	3,18 3,68 5,08 6,35 7,62	PI PNUI PU - -	PI PNUI PU - -	- PNUI PU P P	- PNUI PU - -	- PNUI PU P P	- PNUI PU P P	PU - -
2.063 2.063	3.24 4.50	- -	3.25 -	52,40 52,40	- -	- -	4,84 -	3,96 5,72	PI P	PI P	PI P	PI P	PI P	PI P	P
2-3/8 2-3/8 2-3/8 2-3/8 2-3/8	4.00 4.60 5.80 6.60 7.35	4.70 5.95 7.45		60,32 60,32 60,32 60,32 60,32	5,95 6,85 8,63 9,82 10,94	6,99 8,85 11,09		4,24 4,83 6,45 7,49 8,53	PN PNU	PN PNU	PN PNU PNU P PU	PN PNU PNU - -	PN PNU PNU P PU	PN PNU PNU P PU	PNU PNU
2-7/8 2-7/8 2-7/8 2-7/8	6.40 7.80 8.60 9.35	6.50 7.90 8.70 9.45	- - -	73,02 73,02 73,02 73,02	9,52 11,61 12,80 13,91	9,67 11,76 12,95 14,06	- - -	5,51 7,01 7,82 8,64	PNU - -	PNU - -	PNU PNU PNU PU	PNU PNU PNU -	PNU PNU PNU PU	PNU PNU PNU PU	PNU PNU PNU -
2-7/8 2-7/8	10.50 11.50	-	-	73,02 73,02	15,63 17,11	-	-	9,96 11,18	-	-	P P	-	P P	P P	-
3-1/2 3-1/2 3-1/2 3-1/2 3-1/2 3-1/2 3-1/2	7.70 9.20 10.20 12.70 14.30 15.50 17.00	- 9.30 - 12.95 - - -	- - - - - - -	88,90 88,90 88,90 88,90 88,90 88,90 88,90	11,46 13,69 15,18 18,90 21,28 23,07 25,30	- 13,84 - 19,27 - - -	- - - - - - -	5,49 6,45 7,34 9,52 10,92 12,09 13,46	PN PNU PN - - - -	PN PNU PN - - - -	PN PNU PN PNU P P P	PN PNU PN PNU - - -	PN PNU PN PNU P P P	PN PNU PN PNU P P P	- PNU - PNU - - -
4 4 4 4 4 4	9.50 10.70 13.20 16.10 18.90 22.20	- 11.00 - - - -	- - - - - -	101,60 101,60 101,60 101,60 101,60 101,60	14,14 - 19,64 23,96 28,13 33,04	- 16,37 - - - -	- - - - - -	5,74 6,65 8,38 10,54 12,70 15,49	PN PU - - - -	PN PU - - - -	PN PU P P P P	PN PU - - - -	PN PU P P P P	PN PU P P P P	- - - - - -
4-1/2 4-1/2 4-1/2 4-1/2 4-1/2 4-1/2 4-1/2	12.60 15.20 17.00 18.90 21.50 23.70 26.10	12.75		114,30 114,30 114,30 114,30 114,30 114,30 114,30	18,75 22,62 25,30 28,13 32,00 35,27 38,84	18,97		6,88 8,56 9,65 10,92 12,70 14,22 16,00	PNU	PNU	PNU P P P P P P	PNU - - - - - -	PNU P P P P P P	PNU P P P P P P
P = Plain end, N = Non-upset threaded and coupled, U = External upset threaded and coupled, I = Integral joint.
♦ Nominal linear masses, threads and coupling (col. 2, 3, 4) are shown for information only. ♦ The densities of martensitic chromium steels (L80 types 9Cr and 13Cr) are different from carbon steels. The masses shown are therefore not accurate for martensitic chromium steels. A mass correction factor of 0,989 may be used. ♦ Non-upset tubing is available with regular couplings or special bevel couplings. External-upset tubing is available with regular, special-bevel, or special clearance couplings.