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api 5ct casing and tubing welded pipes (1)

API 5CT ERW Casing Pipes OCTG Casing

API 5CT ERW Casing Pipes OCTG Casing Pipe describes a type of steel pipe specifically designed and manufactured for oil and gas wells. It signifies a casing pipe (a critical structural component of a well) produced using the Electric Resistance Welding method, and it adheres to the strict quality and performance standards outlined by API 5CT.

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, and Premium ends

Usage: Oil and Gas

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

Product Description

What are API 5CT Casing Pipes？

API 5CT casing pipe is a well-engineered and cost-effective solution for a vast majority of oil and gas well casing requirements. Its manufacturing process, combined with strict API standards and rigorous quality control, ensures it performs reliably in challenging downhole environments. The continuous improvements in ERW technology have significantly narrowed the perceived gap between welded and seamless pipes for many applications.

API 5CT Casing Pipes Specification

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	–

API 5CT casing pipes are widely used across the oil and gas industry for:

Surface Casing: The outermost string in a well, protecting shallow formations and preventing contamination. Often uses lower strength grades like J55 or K55.
Intermediate Casing: Used to isolate problematic formations (e.g., high-pressure zones, unstable shale) encountered during drilling.
Production Casing: The innermost casing string, through which oil or gas is produced.
Geothermal Wells: Used in the extraction of geothermal energy.
Water Wells: For specific water well applications where robust casing is required.

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.

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API 5CT ERW Casing Pipes OCTG Casing

Product Description

What are API 5CT Casing Pipes？

API 5CT Casing Pipes Specification

API 5CT casing pipes are widely used across the oil and gas industry for:

Key Characteristics and Differences from Casing and Tubing Pipes

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