API oil casing series

The company has advanced oil casing coupling processing technology and new product development capabilities; has senior professional and technical personnel and skilled workforce; has sophisticated production and processing equipment, inspection equipment and instruments, as well as a wealth of oil-specific tubing (OCTG) products Threading experience.

Key words:

L80-13Cr Coupling / N80 CS buckle / PH6 drill collar / short section / Coupling Conversion and Adapter / wear-resistant short section /

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Product Details

The company's full range of product specifications:

Outer diameter: Φ26.67mm~Φ177.8mm; Wall thickness: 2.87mm~22.2mm

Product Features Description:

Oil pipes are mainly used for oil and gas well drilling and oil and gas transportation. It includes oil drilling pipe, oil casing, oil extraction pipe. Oil drill pipe is mainly used to connect drill collars and drill bits and transmit drilling power. The oil casing is mainly used to support the well wall during the drilling process and after the well completion, so as to ensure the drilling process and the normal operation of the entire oil well after the well completion. The oil suction pipe mainly transports the oil and gas at the bottom of the oil well to the surface.

Oil casing is the lifeline to maintain oil well operation. Due to the different geological conditions, the downhole stress state is complex, and the combined effects of tension, compression, bending and torsional stress act on the pipe body, which puts forward higher requirements on the quality of the casing itself. Once the casing itself is damaged for some reason, it may lead to a reduction in production of the entire well, or even scrap it.

According to the strength of the steel itself, the casing can be divided into different steel grades, namely J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. Different well conditions and well depths require different steel grades. In a corrosive environment, the casing itself is also required to have corrosion resistance. In places with complex geological conditions, the casing is also required to have anti-collapse performance.

Main steel grade properties of the product:

Steel Grade	Type	% elongation under total load	Yield strength MPa		Minimum tensile strength MPa	Maximum hardness		Specify wall thickness	Allow hardness variation
Steel Grade	Type	% elongation under total load	Minimum	maximum	Minimum tensile strength MPa	HRC	HBW	mm	HRC
1	2	3	4	5	6	7	8	9	10
H40	-	0.5	276	552	414	-	-	-	-
J55	-	0.5	379	552	517	-	-	-	-
K55	-	0.5	379	552	655	-		-	-
N80 N80	1 Q	0.5 0.5	552 552	< div align="center">758 758	689 689	--		--	-
R95	-	0.5	655	758	724	-	-	-	-
L80 L80 L80	1 9Cr 13Cr	0.5 0.5 0.5	552 552 552	655 655 655	655 655 655	23.0 23.0 23.0	241 241 241	- - -	-
C90	1	0.5	621	724	689	25.4	255	≤12.70 12.71 to 19.04 19.05 to 25.39 ≥25.40	3.0 4.0 5.0 6.0
T95	1	0.5	655	758	724	25.4	255	≤12.70 12.71 to 19.04 19.05 to 25.39 ≥25.40	3.0 4.0 5.0 6.0
C110	-	0.7	758	828	793	30.0	286	≤12.70 12.71 to 19.04 19.05 to 25.39 ≥25.40	3.0 4.0 5.0 6.0
P110	-	0.6	758	965	862	-	-	-	-
Q125	1	0.65	862	1034	931	b	-	≤12.70 12.71 to 19.04 ≥19.05	3.0 4.0 5.0

The oil casing is mainly used to support the well wall during the drilling process and after the completion of the well, so as to ensure the drilling process and the normal operation of the entire oil well after the completion of the well. The oil pipe mainly transports the oil and gas at the bottom of the oil well to the ground. Several layers of casing are used for each well according to different drilling depths and geological conditions.

Cement cementing should be used after the casing is run down the well. It is different from tubing and drill pipe and cannot be reused. It is a one-time consumable material.

Oil casing is the lifeblood of keeping oil wells running. Due to different geological conditions, the downhole stress state is complex, and the comprehensive action of tension, compression, bending and torsional stress acts on the pipe body, which puts forward higher requirements for the quality of the casing itself. Once the casing itself is damaged for some reason, it may lead to the reduction of production of the whole well, or even to be scrapped.

Casing can be divided into: conduit, surface casing, technical casing and oil casing according to the usage. According to the strength of the steel itself, the casing can be divided into different steel grades, namely J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. The well conditions and well depths are different, and the steel grades used are also different.

API oil casing series