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Carbon dioxide resistant oil casing

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Carbon dioxide resistant oil casing

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　Anti-CO 2 corrosion oil casing, with good resistance to CO 2 corrosion, suitable for acid medium oil and gas wells containing CO 2 or CO 2 and CL coexisting, using special gas-tight threaded joints. The pipe body is made of economical low alloy steel containing Cr, Ni, Mo and other alloy elements 3Cr, 5Cr, 9Cr and stainless steel 13Cr, 15Cr. The steel has high thermodynamic stability and directly blocks the anode process (Cr, Ni). , Mo, etc.) alloying elements and elements that promote the cathodic process and surface activity (Cu, Si, Al, etc.), enable the surface of the material to form a surface protective layer corrosion of a highly stable alloy component having one or several atomic layer thicknesses. Structure to improve the CO 2corrosion resistance of the casing . The oil casing connection joint adopts the patented air-sealed buckle type developed by Changbao, which is suitable for different complicated and demanding working conditions. At present, anti Changbao CO.'S 2 -corrosion oil casing has special thread through domestic authority detection, and is widely used in the major field, wherein the anti-CO.'S 2 -corrosion CB110S-13Cr steel grade CBS1 cannula has passed "ISO 13679 and Petroleum Natural gas industry. Casing and tubing thread connection test procedures" CAL-II test evaluation for evaluation requirements, CBS3 tubing and casing have passed the "ISO 13679 oil and gas industry. Casing and tubing thread connection test procedures" highest evaluation Required CAL-IV test evaluation.

CB80-3Cr, L80-9Cr, L80-13Cr, CB90-3Cr, CB95-3Cr, CB95-13Cr, CB110-3Cr, CB110-5Cr, CB110-13Cr, CB110S-13Cr　Joint performance

Joint form	Resistance to internal pressure and anti-crushing	Tensile efficiency	Anti-compression efficiency	Applicable well condition
S1	Equivalent tube	100% tube	60% tube	Less harsh well conditions, shallow and middle oil and gas wells, etc.
S2		100% tube	60% tube	Harsh well conditions, medium and deep oil and gas wells, etc.
S3		100% tube	60% tube	The most demanding well conditions, deep wells, ultra-deep wells, horizontal wells, etc.
S3C		100% tube	100% tube
SJ		100% tube	60% tube	Low pressure gas seal wells, ordinary horizontal wells, large displacement wells, etc.
-NUFJ		45% ~ 66% tube	45% ~ 66% tube	Repair wells, tail nozzles, etc.
EU-HT / BC-HT	Equivalent to API EU/BC performance			Ordinary oil well

　　"S" means "SUPER" super.

Executive Standard (Partial)
　　API Spec 5CT Sleeve and Tubing Specification
　　NACE-TM0171 Autoclave Corrosion Testing of Metals in High-Temperature Water
　　API Spec 5B Specification for Processing, Measurement and Inspection of Casing, Tubing and Line Pipe Threads
　　ISO 13679/GB/T 21267 oil and gas industry casing and tubing thread connection test procedures
　　...

Physical and chemical properties

Steel grade	name	Yield strength MPa		Tensile strength MPa	Elongation	Impact toughness	Maximum hardness	Scope of application
		min	max	min			HRC
80	CB80-3Cr	552	758	689	Calculated according to the API 5CT formula	N80 requirements according to API 5CT	twenty three	Suitable for low corrosion environments containing CO 2
	L80-9Cr 、L80-13Cr	552	655	655		L80 requirements according to API 5CT		For corrosive environments containing CO 2
								CO P CO 2≥0.02MPa）
90	CB90-3Cr	621	724	689		C90 requirements according to API 5CT	25.4	Suitable for low corrosion environments containing CO 2
95	CB95-3Cr	655	758	724		T95 requirements according to API 5CT	25.4	Suitable for low corrosion environments containing CO 2
	CB95-13Cr							For corrosive environments containing CO 2
								CO2 P CO2≥0.02MPa）
110	CB110-3Cr	758	965	862		P110 requirements according to API 5CT	32	Suitable for low corrosion environments containing CO 2
	CB110-5Cr							Suitable for low corrosion environments containing CO 2
	CB110-13Cr							For corrosive environments containing CO 2
								CO2 P CO2≥0.02MPa）
	CB110S-13Cr							For CO 2 and a small amount of H2S corrosive environment
								CO2 P CO2≥0.02MPa）