The Importance of china Casing tubes in the Oil and gas industry

China Casing tubes play a crucial role in the oil and gas industry. These tubes are an essential component of oil and gas wells, providing structural support and preventing the collapse of the wellbore. They are typically made of steel and are designed to withstand high pressure and extreme temperatures.

One of the primary functions of China Casing Tubes is to protect the wellbore from external forces. When drilling a well, the surrounding rock formations exert pressure on the wellbore, which can cause it to collapse. Casing tubes are installed to provide a strong and stable barrier that prevents the wellbore from collapsing. This is especially important in deepwater drilling or in areas with unstable geological formations.

tensile and Hardness Requirements
grade			Yield strength MPa		Tensile Strength	Hardness a,c		Specified Wall thickness	Allowable Hardness Variation b
	type	Total Elongation Under Load			min MPa	max
			min	max		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	1	0.5	552	758	689	—	—	—	—
N80	Q	0.5	552	758	689	—	—	—	—
R95	—	0.5	655	758	724	—	—	—	—
L80 L80	1	0.5	552	655	655	23	241	—	—
L80	9Cr 13Cr	0.5	552	655	655	23	241	—	—
		0.5	552	655	655	23	241	—	—
C90	1	0.5	621	724	689	25.4	255	£12.70	3
								12.71 to 19.04	4
								19.05 to 25.39	5
								³ 25.40	6
T95	1	0.5	655	758	724	25.4	255	£12.70	3
								12.71 to 19.04	4
								19.05 to 25.39	5
								³ 25.40	6
C110	—	0.7	758	828	793	30	286	£12.70	3
								12.71 to 19.04	4
								19.05 to 25.39	5
								³ 25.40	6
P110	—	0.6	758	965	862	—	—	—	—
Q125	1	0.65	862	1034	931	b	—	£12.70	3
								12.71 to 19.04 19.05	4
									5
a In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method.
b No hardness limits are specified, but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9.
c For through-wall hardness tests of grades L80 (all types), C90, T95 and C110, the requirements stated in HRC scale are for maximum mean hardness number.

In addition to providing structural support, China Casing Tubes also serve as a conduit for the extraction of oil and gas. Once the well has been drilled, production Tubing is inserted into the casing tubes to allow for the flow of hydrocarbons to the surface. The casing tubes ensure that the oil and gas are safely transported from the reservoir to the surface without any leaks or contamination.  API 5L api 5ct j55 K55 N80 L80 P110 Oil casing and tubing oil well casing China Casing Tubes are designed to withstand the harsh conditions of the oil and gas industry. They are made of high-quality steel that is resistant to corrosion and can withstand high pressure and extreme temperatures. This is crucial as oil and gas wells are often located in remote and challenging environments, such as offshore or in deserts. The casing tubes must be able to withstand these conditions to ensure the safety and efficiency of the drilling operation.