API Steel Oilfield Pipe

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The API steel oilfield pipe is extensively used in oil drilling projects. Through thread, the oilfield pipes can be connected with each other to form a casing string which is several kilometers in length and can bear hundreds of standard atmospheric pressure.

Our API steel oilfield pipe is available mainly in the seamless type. Welded casing and tubing are also provided. According to API SPEC 5B, the common casing thread is round thread (CSG) or buttress thread (BCSG).

Standard

Standard		API 5CT-1199/ISO 9001
Material Grade	Tubing	API J55, API K55, API N80, API L80 /P110
Material Grade	Casing	API J55, API N80, API L80 /P110

Product Information

	Tubing	Casing
Outside Diameter	4.5-20 inches (114.3-508 mm)	2.875-4.5 inches (73.02-114.3 mm)
Wall Thickness	5.21-22.24 mm	2.87-16.00 mm
Length	R1 (4.88-7.62), R2 (7.62-10.36), R3 (10.36-14.63)	R1 (6.10-7.32), R2 (8.53-9.75), R3 (11.58-12.80)
Packing Mode	The oilfield pipes come with plastic caps and they are tied with steel strip into the hexagonal bundle. They can also be packed in line with the requirements of customers.
Surface Treatment	black varnish, corrosion protective oil, galvanization or as per customer requirements

Introduction of Tubing and Casing

Grade	API Series of Tubing and Casing		Non-API Series of Oil Casing
	Tubing	Casing	Deep Well High Temperature	High Collapse		Low Temperature	Hot Drilling
	Tubing	Casing	Deep Well High Temperature	Normal	High Collapse	Low Temperature	Hot Drilling
55	J55	J55, K55
65		M65
80	N80-1	N80-1		80T	80TT	80L
	N80Q	N80Q
	L80-1	L80-1
90	C90	C90		90T	90TT	90L	90H
95	T95	T95		95T	95TT	95L	95H
110	P110	P110		110T	110TT	110L	110H
125		Q125		125T	125TT	125L	125H
140			V140
150			V150

Production Capability

Products	Tube Type	Steel Grade	External Diameter (mm)	Wall Thickness (mm)	Thread Type*
Casing and Coupling	Seamless Type	H40, J55, K55, M65, L80, C95, N80, C90, T95, P110, Q125	4.5-20 inches (114.3-508mm)	0.205-0.875 inch (5.2-22.2mm)	P S L B E
Oil Casing Tube	Seamless Type	H40, J55, L80, N80, C90, T95, P110	1.05-4.5 inches (26.67-114.3mm)	0.113-0.63 inch (2.87-16mm)	P N U I

Note: P=Plain End, S=STC, L=LC, B=BTC, E=XC, N=NU, U=EU, I=IJ

Tolerance

Item	Tolerance
External Diameter	D<114.3mm, ±0.79mm
Wall Thickness	D≥114.3mm, -0.5~ 1.0% D
Weight (one piece)	6.5%, -3.5%

Related Names
Oil Well Casing | Oil Well Tubing

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