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api 5ct casing and tubing welded pipes (2)

api 5ct casing and tubing welded pipes (1)

OCTG API 5CT ERW Tubing Pipes

Grade： H40/ L80/ R95/ N80-1/ N80Q/ C90/ T95/ P110

Out Diameter: 1.9″-4 1/2″

Wall Thickness： 3.18 – 16 mm

Length: R1/ R2/ R3

Ends: BTC, UN, EUE, Premium ends

Usage: Oil and Gas

Surface: Red, Black, Varnish, Oil, 3PE, etc

Product Description

What are OCTG API 5CT Tubing pipes?

OCTG API 5CT Tubing pipe refers to a type of seamless or welded steel pipe that meets the American Petroleum Institute (API) Specification 5CT for use as production tubing in oil and gas wells.

OCTG (Oil Country Tubular Goods): As mentioned before, this is the umbrella term for all steel tubular products used in oil and gas exploration and production. Tubing falls under this category alongside drill pipe and casing.
API 5CT: This is the foundational standard that dictates the technical delivery conditions for steel pipes used as casing and tubing in the petroleum and natural gas industries. It covers material grades, dimensions, mechanical properties, heat treatment, testing, and connection types. Adherence to API 5CT ensures the tubing’s reliability and suitability for harsh downhole environments.
Tubing Pipe: This is the internal conduit installed inside the casing string after the well has been drilled and completed. Its primary purpose is to transport hydrocarbons (oil, gas, and associated fluids) from the reservoir to the surface facilities.

API 5CT Tubing Pipes Specifications

Outside Diameter (O.D)	THICKNESS （TK）	Weight	End processing form
Grade
Inch	mm	Inch	mm	TBG	UPTBG	J55	L80-1	N80	C90	T95	P110
1.900″	48.26	0.145	3.68	2.75	2.9	PNUI	PNUI	PNUI	PNUI	PNUI	–
2 3/8″	60.32	0.254	6.45	5.8	5.95	–	PNU	PNU	PNU	PNU	PNU
2 7/8″	73.02	0.308	7.82	8.6	8.7	–	PNU	PNU	PNU	PNU	PNU
3 1/2″	88.9	0.289	7.34	10.2	–	PN	PN	PN	PN	PN	PNU
4″	101.6	0.262	6.65	10.7	11	PU	PU	PU	PU	PU	–
4 1/2″	114.3	0.271	6.88	12.6	12.75	PNU	PNU	PNU	PNU	PNU	–

Key Characteristics and Differences from Casing and Tubing Pipes

While both casing and tubing are covered by API 5CT, they have distinct functions and characteristics:

Feature	Casing Pipe	Tubing Pipe
Primary Function	Structural support: Lines the wellbore to prevent collapse, isolate formations, and control well pressure. It’s a permanent structural component.	Fluid conveyance: Transports produced oil, gas, and water from the reservoir to the surface. It’s the primary flow path for hydrocarbons.
Installation	Installed in sections and cemented permanently into the wellbore during the drilling process.	Run inside the casing string after drilling and completion. It is typically retrievable and can be replaced if damaged or if the well’s production strategy changes.
Diameter	Generally larger in diameter (e.g., 4.5 inches up to 36 inches or more). The casing string “telescopes” down in size with depth.	Generally smaller in diameter (e.g., 1.5 inches to 4.5 inches), designed to fit inside the casing.
Wall Thickness	Generally thicker to withstand external collapse pressure from rock formations and internal burst pressure from well fluids.	Generally thinner than casing, as its primary role is fluid flow, though it still needs to handle internal pressure and be robust enough for its operational environment.
Loads Faced	Primarily external collapse pressure, axial tension from its own weight, and internal burst pressure.	Internal burst pressure (from produced fluids), axial tension (from its own weight and any attached downhole equipment), and often corrosive attack from produced fluids.
Replaceability	Generally not replaceable once cemented in place.	Replaceable, which is a significant operational advantage for maintenance and well interventions.
Typical End Connections	Short Round Thread (STC), Long Round Thread (LTC), Buttress Thread (BTC), and various premium connections for higher performance.	Non-Upset (NU), External Upset (EU), Integral Joint (IJ), and a wide range of premium connections designed for excellent sealability and flow.