Introduction to  API specification 5CT seamless steel Pipe Oil Casing

API Specification 5CT Seamless Steel Pipe Oil Casing J55/N80/L80/ C90/T95/P110/K55 API Specification 5CT is a standard developed by the American petroleum institute (API) that specifies the technical requirements for seamless steel pipe oil casing used in the petroleum industry. This specification covers various grades of casing, including J55, N80, L80, C90, T95, p110, and K55.

							Calculated Mass c
			Nominal linear Mass T& C b,c	Wall thick– ness				em, Mass Gain or Loss Due to End Finishing d
Labels a		Outside diameter			Inside Diameter	Drift Diameter	Plain- end	kg
								Round thread		Buttress Thread
							wpe
		D	kg/m	t	D	mm	kg/m	Short	Long	RC	SCC
		mm		mm	mm
1	2	3	4	5	6	7	8	9	10	11	12
7	17	177.8	25.6	5.87	166.06	162.88	24.89	7.61	—	—	—
7	20	177.8	29.91	6.91	163.98	160.8	29.12	6.74	— 7.94	— 8.28	— 0.58
7	23	177.8	34.67	8.05	161.7	158.75 e 158.52 156.24 153.90	33.7	6.26	7.94	8.28	0.58
7	23	177.8	34.67	8.05	161.7	152.40 e	33.7	6.26	7.37	7.65	–0.54
7	26	177.8	39.14	9.19	159.42	151.6	38.21	5.79	6.79	7.13	–0.69
7	29	177.8	43.6	10.36	157.08	149.32	42.78	—	6.23	6.4	–1.31
7	32	177.8	47.92	11.51	154.78	147.18	47.2	—	6.23	6.4	–1.31
7	32	177.8	47.92	11.51	154.78	142.86	47.2	—	5.68	5.79	–1.91
7	35	177.8	52.09	12.65	152.5	139.72	51.52	—	5.18	5.24	–2.47
7	38	177.8	56.1	13.72	150.36	136.52	55.52	—	—	—	—
7	42.7	177.8	63.84	15.88	146.04	133.38	63.41	—	—	—	—
7	46.4	177.8	69.35	17.45	142.9	130.18	69.01	—	—	—	—
7	50.1	177.8	74.85	19.05	139.7		74.58	—	—	—	—
7	53.6	177.8	80.21	20.62	136.56		79.93	—	—	—	—
7	57.1	177.8	85.42	22.22	133.36		85.25	—
7 5/8	24	193.68	35.72	7.62	178.44	175.26	34.96	7.11	— 8.58	— 9.12	— 2.59
7 5/8	26.4	193.68	39.29	8.33	177.02	173.84	38.08	6.78	7.91	8.38	1.84
7 5/8	29.7	193.68	44.2	9.52	174.64	171.46	43.24	—	7.13	7.51	0.98
7 5/8	33.7	193.68	50.15	10.92	171.84	168.66	49.22	—	6.16	6.44	– 0.10
7 5/8	39	193.68	58.04	12.7	168.28	165.1	56.68	—	5.32	5.5	–1.03
7 5/8	42.8	193.68	63.69	14.27	165.14	161.96	63.14	—	4.87	5.01	–1.52
7 5/8	45.3	193.68	67.41	15.11	163.46	160.28	66.54	—	4.48	4.57	–1.96
7 5/8	47.1	193.68	70.09	15.88	161.92	158.74	69.63	—	—	—	—
7 5/8	51.2	193.68	76.19	17.45	158.78	155.6	75.84	—	—	—	—
7 5/8	55.3	193.68	82.3	19.05	155.58	152.4	82.04	—
7 3/4	46.1	196.85	68.6	15.11	166.63	165.10 e	67.72	—	—	—	—
7 3/4	46.1	196.85	68.6	15.11	166.63	163.45	67.72	—	—	—	—

Seamless steel pipe oil casing is an essential component in Oil and gas exploration and production. It is used to protect the wellbore and ensure the safe and efficient extraction of oil and gas from the reservoir. The casing provides structural support to the well and prevents the collapse of the wellbore walls. It also isolates different formations and prevents the mixing of fluids. API Specification 5CT sets the standards for the manufacturing, testing, and inspection of seamless steel pipe oil casing. It ensures that the casing meets the necessary requirements for strength, durability, and corrosion resistance. The specification covers both plain-end and threaded-end casing, with various connection types available. Essential Oil 10 Ml Case One of the most commonly used grades of casing is J55. It has a minimum yield strength of 55,000 psi and is suitable for shallow to medium-depth wells. J55 casing is known for its excellent resistance to corrosion and high tensile strength. It is often used in mild sour environments and has good weldability. N80 Casing is another popular grade specified in API Specification 5CT. It has a minimum yield strength of 80,000 psi and is suitable for medium to deep wells. N80 casing is known for its high resistance to corrosion and excellent mechanical properties. It is often used in moderately sour environments and can withstand high pressure and temperature conditions. L80 casing is a higher strength grade with a minimum yield strength of 80,000 psi. It is suitable for medium to deep wells and has excellent resistance to corrosion and mechanical properties. L80 casing is often used in sour environments and can withstand high pressure and temperature conditions.

C90 casing is a higher strength grade with a minimum yield strength of 90,000 psi. It is suitable for deep wells and has excellent resistance to corrosion and mechanical properties. C90 casing is often used in sour environments and can withstand high pressure and temperature conditions. T95 casing is a higher strength grade with a minimum yield strength of 95,000 psi. It is suitable for deep wells and has excellent resistance to