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Casing

Keywords: API 5CT Casing, Well Casing, Seamless (SMLS), Electric Resistance Welded (ERW), Casing, Oil Pipe

Size: OD: 4 1/2’’ ~ 20’’ (114.3mm ~ 508mm)；WT: 0.205’’ ~ 0.635’’ (5.21mm ~ 16.13mm)；LENGTH: R1, R2, R3

Standard & Grade: API 5CT J 55/K55/N80/C75/L80/C90/T95/Q125

Ends: Beveled, Square Cut, With LTC/STC/BTC/VAM Connection

Packing: Protection Caps in Both Ends, Waterproof Paper Wrapped, Two Tags

Usage: Used as the Structural Retainer for the Walls of Oil, Gas Wells

Thread types: STC, LTC, BTC, Special Clearance, Premium Connection

Application: Oil Well Casing Serves As Well Sidewall

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Product Detail
Specification
Standard
Painting & Coating
Packing & Loading
FAQ

Casing is a large-diameter pipe that serves as the structural retainer for the walls of oil and gas wells, or well bore.It is inserted into a well bore and cemented in place to protect both subsurface formations and the well bore from collapsing and to allow drilling fluid to circulate and extraction to take place. Steel Casing Pipes have smooth wall & minimum yield strength of 35,000 psi.

Well Casing serves as well sidewall. Standards and Technical Conditions for Supply:API Spec 5CT ISO13680 Grade: J55, K55, N80-1,N80-Q, L80-1, L80-9Cr,L80-13Cr,C95, P110. Tread types: NUE, EUE, VAM, STC, LTC, BTC, special clearance, XC,VAM TOP,NEW VAM.

Oil Casing Pipe: Casings are used for fixing the well wall or down hole, which have wide diameters, can be divided into conductor casings, technical casings and Oil casings.

Uses: Well Casing serves as well sidewall.

Standards and Technical Conditions for Supply: API Spec 5CT

Grade of pipe casing: J55, K55, N80-1,N80-Q, L80-1, L80-9Cr,L80-13Cr,C95, P110.

Tread types of pipe casing : STC, LTC, BTC, special clearance, XC,VAM TOP,NEW VAM.

Dimension: OD: 114.3-508mm WT: 5.21-16.13mm

What is API 5CT casing ?

API SPEC 5CT well casing is utilized in fixing the well wall or down hole, which has wider diameters. API SPEC 5CT can be divided into conductor casing, technical casing and oil casing.

API 5CT is standard technical specifications for steel casing pipes used for oil wells in petroleum and natural gas industries.

Common Grades

• J55/K55

• N80/N80Q/L80

• C90

• R95/T95

• P110/C110

• Q125

Connections

API 5CT is applicable to following connections which complied with API SPEC 5B:

• SC: Short round thread casing

• LC: Long ound thread casing

• BC: Buttress thread casing

• NU: Non-upset tubing

• EU: External upset tubing

• IJ: Integral tubing connections

Lengths:

Oil Casing	Range 1	Range 2	Range 3
Oil Casing	4.88~7.62	7.62~10.36	10.36~14.63

Dimension:

Labels		Outside diameter D	Nominal linear mass T&C	Wall thickness t	J55	N80	L80	C90	P110	Q125
Labels		mm	kg/m	mm	K55	1/Q?	L80	T95	P110	Q125
1	2	3	4	5	6	7	8	9	10	11
4 1/2	9.5	114.3	14.14	5.21	PS	-	-	-	-	-
4 1/2	10.5	114.3	15.63	5.69	PSB	-	-	-	-	-
4 1/2	11.6	114.3	17.26	6.35	PSLB	PLB	PLB	PLB	PLB	-
4 1/2	13.5	114.3	20.09	7.37	-	PLB	PLB	PLB	PLB	-
4 1/2	15.1	114.3	22.47	8.56	-	-	-	-	PLB	PLB
5	11.5	127	17.11	5.59	PS	-	-	-	-	-
5	13	127	19.35	6.43	PSLB	-	-	-	-	-
5	15	127	22.32	7.52	PSLBE	PLBE	PLBE	PLBE	PLBE	-
5	18	127	26.79	9.19	-	PLBE	PLBE	PLBE	PLBE	PLBE
5	21.4	127	31.85	11.1	-	PLB	PLB	PLB	PLB	PLB
5	23.2	127	34.53	12.14	-	PLB	PLB	PLB	PLB	PLB
5	24.1	127	35.86	12.7	-	PLB	PLB	PLB	PLB	PLB
5 1/2	14	139.7	20.83	6.2	PS	-	-	-	-	-
5 1/2	15.5	139.7	23.07	6.98	PSLBE	-	-	-	-	-
5 1/2	17	139.7	25.3	7.72	PSLBE	PLBE	PLBE	PLBE	PLBE	-
5 1/2	20	139.7	29.76	9.17	-	PLBE	PLBE	PLBE	PLBE	-
5 1/2	23	139.7	34.23	10.54	-	PLBE	PLBE	PLBE	PLBE	PLBE
5 1/2	26.8	139.7	39.88	12.7	-	-	-	P	-	-
5 1/2	29.7	139.7	44.2	14.27	-	-	-	P	-	-
5 1/2	32.6	139.7	48.51	15.88	-	-	-	P	-	-
5 1/2	35.3	139.7	52.53	17.45	-	-	-	P	-	-
5 1/2	38	139.7	56.55	19.05	-	-	-	P	-	-
5 1/2	40.5	139.7	60.27	20.62	-	-	-	P	-	-
5 1/2	43.1	139.7	64.14	22.22	-	-	-	P	-	-
6 5/8	20	168.28	29.76	7.32	PSLB	-	-	-	-	-
6 5/8	24	168.28	35.72	8.94	PSLBE	PLBE	PLBE	PLBE	PLBE	-
6 5/8	28	168.28	41.67	10.59	-	PLBE	PLBE	PLBE	PLBE	-
6 5/8	32	168.28	47.62	12.06	-	PLBE	PLBE	PLBE	PLBE	PLBE
7	17	177.8	25.3	5.87	-	-	-	-	-	-
7	20	177.8	29.76	6.91	PS	-	-	-	-	-
7	23	177.8	34.23	8.05	PSLBE	PLBE	PLBE	PLBE	-	-
7	26	177.8	38.69	9.19	PSLBE	PLBE	PLBE	PLBE	PLBE	-
7	29	177.8	43.16	10.36	-	PLBE	PLBE	PLBE	PLBE	-
7	32	177.8	47.62	11.51	-	PLBE	PLBE	PLBE	PLBE	-
7	35	177.8	52.09	12.65	-	PLBE	PLBE	PLBE	PLBE	PLBE
7	38	177.8	56.55	13.72	-	PLBE	PLBE	PLBE	PLBE	PLBE
7	42.7	177.8	63.54	15.88	-	-	-	P	-	-
7	46.4	177.8	69.05	17.45	-	-	-	P	-	-
7	50	177.8	74.56	19.05	-	-	-	P	-	-
7	53.6	177.8	79.77	20.62	-	-	-	P	-	-
7	57.1	177.8	84.97	22.22	-	-	-	P	-	-
7 5/8	24	193.68	35.72	7.62	-	-	-	-	-	-
7 5/8	26.4	193.68	39.29	8.33	PSLBE	PLBE	PLBE	PLBE	-	-
7 5/8	29.7	193.68	44.2	9.52	-	PLBE	PLBE	PLBE	PLBE	-
7 5/8	33.7	193.68	50.15	10.92	-	PLBE	PLBE	PLBE	PLBE	-
7 5/8	39	193.68	58.04	12.7	-	PLBE	PLBE	PLBE	PLBE	PLBE
7 5/8	42.8	193.68	63.69	14.27	-	PLB	PLB	PLB	PLB	PLB
7 5/8	45.3	193.68	67.41	15.11	-	PLB	PLB	PLB	PLB	PLB
7 5/8	47.1	193.68	70.09	15.88	-	PLB	PLB	PLB	PLB	PLB
7 5/8	51	193.68	76.19	17.45	-	-	-	P	-	-
7 5/8	55.3	193.68	82.3	19.05	-	-	-	P	-	-
8 5/8	24	219.08	35.72	6.71	PS	-	-	-	-	-
8 5/8	28	219.08	41.67	7.72	-	-	-	-	-	-
8 5/8	32	219.08	47.62	8.94	PSLBE	-	-	-	-	-
8 5/8	36	219.08	53.57	10.16	PSLBE	PLBE	PLBE	PLBE	-	-
8 5/8	40	219.08	59.53	11.43	-	PLBE	PLBE	PLBE	PLBE	-
8 5/8	44	219.08	65.48	12.7	-	PLBE	PLBE	PLBE	PLBE
8 5/8	49	219.08	72.92	14.15	-	PLBE	PLBE	PLBE	PLBE	PLBE
9 5/8	32	244.48	48.07	7.92	-	-	-	-	-	-
9 5/8	36	244.48	53.57	8.94	PSLB	-	-	-	-	-
9 5/8	40	244.48	59.53	10.03	PSLBE	PLBE	PLBE	PLBE	-	-
9 5/8	43.5	244.48	64.73	11.05	-	PLBE	PLBE	PLBE	PLBE	-
9 5/8	47	244.48	69.94	11.99	-	PLBE	PLBE	PLBE	PLBE	PLBE
9 5/8	53.5	244.48	79.62	13.84	-	PLBE	PLBE	PLBE	PLBE	PLBE
9 5/8	58.4	244.48	86.91	15.11	-	PLB	PLB	PLB	PLB	PLB
9 5/8	59	244.48	88.4	15.47	-	-	-	P	-	-
9 5/8	64.9	244.48	96.58	17.07	-	-	-	P	-	-
9 5/8	70.3	244.48	104.62	18.64	-	-	-	P	-	-
9 5/8	75.6	244.48	112.5	20.24	-	-	-	P	-	-
10 3/4	32.75	273.05	48.74	7.09	-	-	-	-	-	-
10 3/4	40.5	273.05	60.27	8.89	PSB	-	-	-	-	-
10 3/4	45.5	273.05	67.71	10.16	PSBE	-	-	-	-	-
10 3/4	51	273.05	75.9	11.43	PSBE	PSBE	PSBE	PSBE	PSBE	-
10 3/4	55	273.05	82.59	12.57	-	PSBE	PSBE	PSBE	PSBE	-
10 3/4	60.7	273.05	90.33	13.84	-	-	-	PSBE	PSBE	PSBE
10 3/4	65.7	273.05	97.77	15.11	-	-	-	PSB	PSB	PSB
10 3/4	73.2	273.05	108.93	17.07	-	-	-	P	-	-
10 3/4	79.2	273.05	117.86	18.64	-	-	-	P	-	-
10 3/4	85.3	273.05	126.94	20.24				P
11 3/4	42	298.45	62.5	8.46	-	-	-	-	-	-
11 3/4	47	298.45	69.94	9.53	PSB	-	-	-	-	-
11 3/4	54	298.45	80.36	11.05	PSB	-	-	-	-	-
11 3/4	60	298.45	89.29	12.42	PSB	PSB	PSB	PSB	PSB	PSB
11 3/4	65	298.45	96.73	13.56	-	P	P	P	P	P
11 3/4	71	298.45	105.66	14.78	-	P	P	P	P	P
13 3/8	48	339.72	71.43	8.38	-	-	-	-	-	-
13 3/8	54.5	339.72	81.1	9.65	PSB	-	-	-	-	-
13 3/8	61	339.72	90.78	10.92	PSB	-	-	-	-	-
13 3/8	68	339.72	101.19	12.19	PSB	PSB	PSB	PSB	PSB	-
13 3/8	72	339.72	107.15	13.06	-	PSB	PSB	PSB	PSB	PSB
16	65	406.4	96.73	9.53	-	-	-	-	-	-
16	75	406.4	111.61	11.13	PSB	-	-	-	-	-
16	84	406.4	125.01	12.57	PSB	-	-	-	-	-
16	109	406.4	162.21	16.66	P	P	P	-	P	P
18 5/8	87.5	473.08	130.21	11.05	PSB	-	-	-	-	-
20	94	508	139.89	11.13	PSLB	-	-	-	-	-
20	106.5	508	158.49	12.7	PSLB	-	-	-	-	-
20	133	508	197.93	16.13	PSLB	-	-	-	-	-
P——Plain end; S——Short round thread;L——Long round thread;B——Buttress thread;E——Extreme line.

Mechanical Properties:

Group	Grade	Type	Total elongation under load %	Yield strength Mpa		Tensile strength min MPa	Hardness max
Group	Grade	Type	Total elongation under load %	min	max	Tensile strength min MPa	HRC	HBW
1	2	3	4	5	6	7	8	9
1	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	-	-
2	L80	1	0.5	552	655	655	23	241
	L80	9Cr	0.5	552	655	655	23	241
	L80	13Cr	0.5	552	655	655	23	241
	C90	1?2	0.5	621	724	689	25.4	255
	C95	-	0.5	655	758	724	-	-
	T95	1?2	0.5	655	758	724	25.4	255
3	P110	-	0.6	758	965	862	-	-
4	Q125	All	0.65	862	1034	931	-	-

Tolerance

Types of steel tubes	Outer Diameter		Wall Thickness
Cold-rolled tubes	Tube sizes(mm)	Tolerances(mm)	Tolerances(mm)
	＜114.3	±0.79	－12.5%
			－12.5%

Chemical Composition

Standard	Grade	Chemical compositions（％）
API SPEC 5CT	J55	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	V
	K55	0.34～0.39	0.20～0.35	1.25～1.50	≤0.020	≤0.015	≤0.15	≤0.20	≤0.20	/	/
	N80	0.34～0.38	0.20～0.35	1.45～1.70	≤0.020	≤0.015	≤0.15	/	/	/	0.11～0.16
	L80	0.15～0.22	≤1.00	0.25～1.00	≤0.020	≤0.010	12.0～14.0	≤0.20	≤0.20	/	/
	P110	0.26～0.395	0.17～0.37	0.40～0.70	≤0.020	≤0.010	0.80～1.10	≤0.20	≤0.20	0.15～0.25	≤0.08

Mechanical Properties

Grade	Type	Total elongation under load (%)	Yield strength (min)	Yield strength (max)	Tensile strength min Mpa	Hardness Max (HRC)	Hardness Max(HBW)
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	-	-
L80	1	0.5	552	655	655	23	241
L80	9Cr	0.5	552	655	655	23	241
L80	13Cr	0.5	552	655	655	23	241
C90	-	0.5	621	724	689	25.4	255
C95	-	0.5	655	758	724	-	-
T95	-	0.5	655	758	724	25.4	255
P110	-	0.6	758	965	862	-	-
Q125	All	0.65	862	1034	931	-	-

Anti-Corrosion Water Based Paint

What is OCTG and what are its main components?

OCTG stands for Oil Country Tubular Goods. It is a family of seamless or welded steel pipes specifically designed for use in oil and gas wells. OCTG is essential for drilling, completing, and producing from a well. The three primary components are:
Casing: The structural "backbone" of the well. It is run into the drilled hole to prevent the wellbore from collapsing and to isolate different underground formations (e.g., freshwater zones from oil/gas zones).
Tubing: The conduit placed inside the casing. It serves as the channel through which oil or gas is brought to the surface during production.
Drill Pipe: The heavy, thick-walled pipe used to transmit drilling fluid to the drill bit and to rotate the bit during the drilling process.

What steel grades do you supply, and what do they mean?

We supply a comprehensive range of API 5CT standard steel grades, each designed for specific well conditions. The grade indicates the minimum yield strength (in ksi) and the material's properties.
Group 1 (Standard Grades):
H40, J55, K55: General-purpose grades for shallow to medium-depth wells with low to moderate pressure. K55 is commonly used for surface casing.
Group 2 (Higher Strength):
N80 (Type 1 & 2): A versatile, high-strength grade suitable for a wide range of applications, including intermediate and production casing.
L80 (Type 1, 9Cr, 13Cr): Designed for sour service environments (containing H₂S). L80-13Cr offers superior corrosion resistance.
Group 3 (High Performance):
C90, T95: Used in high-pressure, high-temperature (HPHT) wells and sour service applications.
P110, Q125: High-strength grades for deep wells and high-pressure environments where maximum burst and collapse resistance are required.

What types of connections (threads) are available?

The connection is a critical component of any OCTG string. We offer both standard API connections and advanced Premium Connections.
API Connections:
Short Round Thread (STC): A simple, cost-effective connection for shallow wells.
Long Round Thread (LTC): Similar to STC but with a longer thread for slightly better performance.
Buttress Thread (BTC): Provides high tensile strength and is suitable for deeper, heavier wells.
Premium Connections (Non-API):
These are engineered for extreme conditions, offering superior gas-tight sealing, high tensile strength, and excellent fatigue resistance. They are essential for HPHT wells, deepwater applications, and complex well geometries. We can supply various premium connection types based on your specific project requirements.

How do you ensure the quality and integrity of the pipes?

We implement a rigorous multi-stage quality control process to ensure every pipe meets the required specifications:
Chemical Composition Analysis: Verifying the steel grade's elemental makeup.
Mechanical Property Testing: Including tensile, yield, hardness, and impact tests.
Hydrostatic Testing: Every pipe is pressure-tested to ensure it can withstand specified internal pressures without leaking.
Non-Destructive Testing (NDT): We utilize advanced NDT methods such as Ultrasonic Testing (UT) and Electromagnetic Testing (ET) to detect any internal or surface imperfections.
Dimensional Inspection: Precise measurement of outside diameter (OD), wall thickness, weight, and length.

What is your typical lead time and packaging for export?

Lead Time: For standard API grades and sizes, our lead time is typically 15-30 days after receiving the deposit and final order confirmation. For specialized grades or premium connections, the timeline may be longer.
Packaging: To ensure safe ocean transport, all OCTG products are securely packed. Threads are protected with steel or plastic protectors, and pipes are bundled with steel straps. We can also apply anti-corrosion oil or varnish and use wooden crates for extra protection as per customer requirements.

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Tags : API 5CT casing , oil well casing , OCTG casing , J55 casing , K55 casing , N80 casing , L80 casing , P110 casing , Q125 casing , BTC casing , LTC casing , STC casing , seamless casing , ERW casing , surface casing , technical casing , production casing