API Casing Suppliers,Manufacturers in china

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API Casing Suppliers,Manufacturers in china

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API Casing

Category : OCTG

Application：Oil well casing serves as well sidewall

Pipe Standard：API SPEC 5CT

Size：OD: 114.3-508mm,WT: 5.21-16.13mm

Process Type: Seamless (SMLS), Electric Resistance Welded (ERW)

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

Thread types:STC, LTC, BTC etc

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Description
Specification
Standard
Process
Packing

Casing is used for lining the complete borehole which has been dug into the ground to procure oil. Similar to the drill pipe, the oil well casing pipe is also subjected to axial tension, therefore they are required to be made from high-quality strong steel material. OCTG casing is large diameter pipe which are held in place in the borehole using cement.

The diameters of OCTG casing pipe range from 4.5″ to 36″. The well-cemented pipe acts as the structural component of the well and offer hole integrity. They prevent the well from collapsing when the drilling process is on. Good quality, well cemented casing can stay in place for the whole life of the well.

The oil well casing pipe are further divided into:

Conductor Casing – Conductor casing is the first boundary between the surface and the subsurface. It helps prevention of well collapse; it keeps away the groundwater and most importantly provides structural support. Conductor casing is installed in the ground by either drilling it or hammering it down. They are available in sizes ranging from 18″ to 36″.

Surface Casing – The purpose of Surface casing is primarily environmental and to ensure safety. It helps in separating the freshwater zones, offering protection from blowout and supporting the wellhead and blow out prevention equipment. Therefore surface casings are required to maintain very high safety standards. They are responsible for supporting the next casing in line. They may vary in size depending on their purpose, but the most common size of surface casing is 13 3/8”.

Intermediate Casing: Intermediate casing is not always required in all types of oil and gas production. If used, they are placed between the surface and the production casing. They are available in sizes ranging from 13 3/8” to 16”.

Production Casing – Production casing help provide structural integrity and pressure control of the hydrocarbon-bearing sections mainly during the production of oil.

Production Liner – Production liners can be suspended from the production casing or one of the previous casings. They help in reducing the cost significantly as the liner is not required to run through the full depth of the well. Liners can be pre-perforated to help save time and cost.

More casing pipes and their colors

API 5CT Well Casing Length:

API 5CT Casing	Range 1	Range 2	Range 3
API 5CT Casing	4.88~7.62	7.62~10.36	10.36~14.63

Dimension

Labels		OD(mm)	WT(mm)	J55/K55	N80	L80	C90/T95	P110	Q125
4 1/2	9.5	114.3	5.21	PS	-	-	-	-	-
	10.5	114.3	5.69	PSB	-	-	-	-	-
	11.6	114.3	6.36	PSLB	PLB	PLB	PLB	PLB	-
	13.5	114.3	7.37	-	PLB	PLB	PLB	PLB	-
	15.1	114.3	8.56	-	-	-	-	PLB	PLB
5	11.5	127	5.59	PS	-	-	-	-	-
	13		6.43	PSLB	-	-	-	-	-
	15		7.52	PSLBE	PLBE	PLBE	PLBE	PLBE	-
	18		9.19	-	PLBE	PLBE	PLBE	PLBE	PLBE
	21.4		11.10	-	PLB	PLB	PLB	PLB	PLB
	23.2		12.14	-	PLB	PLB	PLB	PLB	PLB
	24.1		12.7	-	PLB	PLB	PLB	PLB	PLB
5 1/2	14	139.7	6.20	PS	-	-	-	-	-
	15.5		6.98	PSLBE	-	-	-	-	-
	17		7.72	PSLBE	PLBE	PLBE	PLBE	PLBE	-
	20		9.17	-	PLBE	PLBE	PLBE	PLBE	-
	23		10.54	-	PLBE	PLBE	PLBE	PLBE	PLBE
	26.8		12.7	-	-	-	P	-	-
	29.7		14.27	-	-	-	P	-	-
	32.6		15.88	-	-	-	P	-	-
	35.3		17.45	-	-	-	P	-	-
	38		19.05	-	-	-	P	-	-
	40.5		20.62	-	-	-	P	-	-
	43.1		64.14	-	-	-	P	-	-
6 5/8	20	168.28	7.32	PSLB
	24		8.94	PSLBE	PLBE	PLBE	PLBE	PLBE	-
	28		10.59	-	PLBE	PLBE	PLBE	PLBE	-
	32		12.06	-	PLBE	PLBE	PLBE	PLBE	PLBE
7	20	177.8	6.91	PS
	23		8.05	PSLBE	PLBE	PLBE	PLBE	-	-
	26		9.19	PSLBE	PLBE	PLBE	PLBE	PLBE	-
	29		10.6		PLBE	PLBE	PLBE	PLBE
	32		11.51		PLBE	PLBE	PLBE	PLBE
	35		12.65		PLBE	PLBE	PLBE	PLBE	PLBE
	38		13.72		PLBE	PLBE	PLBE	PLBE	PLBE
7 5/8	26.4	193.67	8.33	PSLBE	PLBE	PLBE	PLBE	-	-
	29.7		9.52	-	PLBE	PLBE	PLBE	PLBE	-
	33.7		10.92	-	PLBE	PLBE	PLBE	PLBE	-
	39		12.7	-	PLBE	PLBE	PLBE	PLBE	PLBE
	42.8		14.27	-	PLB	PLB	PLB	PLB	PLB
	45.3		15.11	-	PLB	PLB	PLB	PLB	PLB
	47.1		15.88	-	PLB	PLB	PLB	PLB	PLB
8 5/8	24	219.08	6.71	PS	-	-	-	-	-
	28		7.72	-	-	-	-	-	-
	32		8.94	PSLBE	-	-	-	-	-
	36		10.16	PSLBE	PLBE	PLBE	PLBE	-	-
	40		11.43	-	PLBE	PLBE	PLBE	PLBE	-
	44		12.70	-	PLBE	PLBE	PLBE	PLBE	-
	49		14.15	-	PLBE	PLBE	PLBE	PLBE	PLBE
9 5/8	36	244.48	8.94	PSLB	-	-	-	-	-
	40		10.03	PSLBE	PLBE	PLBE	PLBE	-	-
	43.5		11.05	-	PLBE	PLBE	PLBE	PLBE
	47		11.99	-	PLBE	PLBE	PLBE	PLBE	PLBE
	53.5		13.84	-	PLBE	PLBE	PLBE	PLBE	PLBE
	58.4		15.11	-	PLB	PLB	PLB	PLB	PLB
10 3/4	40.5	273.05	8.89	PSB	-	-	-	-	-
	45.5		10.16	PSBE	-	-	-	-	-
	51		11.43	PSBE	PSBE	PSBE	PSBE	PSBE	-
	55		12.57	-	PSBE	PSBE	PSBE	PSBE	-
	60.7		13.84	-	-	-	PSBE	PSBE	PSBE
	65.7		15.11	-	-	-	PSB	PSB	PSB
113/4	47	298.45	9.53	PSB	-	-	-	-	-
	54		11.05	PSB	-	-	-	-	-
	60		12.42	PSB	PSB	PSB	PSB	PSB	PSB
13 3/8	48	339.72	8.38	-	-	-	-	-	-
	54.5		9.65	PSB	-	-	-	-	-
	61		10.92	PSB	-	-	-	-
	68		12.19	PSB	PSB	PSB	PSB	PSB	-
	72		13.06	-	PSB	PSB	PSB	PSB	PSB
16	75	406	11.13	PSB	-	-	-	-	-
	84		12.57	PSB	-	-	-	-	-
	109		16.66	P	P	P	-	P	P
20	94	508	11.13	PSLB	-	-	-	-	-
30	96	762	16.13	PSLB	-	-	-	-	-
P-Plain end; S-Short round thread; L-Long round thread; B-Buttress thread; E-Extreme line;

Dimension Tolerances

		Tolerance
D Outside Diameter	Pipe Body	D≤101.60mm，±0.79mm
		D≥114.30mm，+1.0%, -0.5%D
	Coupling	±1%D
t Wall Thickness		0, -12.5%t
Weight	Single Lengths	+6.5%,-3.5%
	Carload Lots or Order Quantity	≥18144 kg(40000ib)，0,-1.75%
		＜18144 kg(40000ib)，0,-3.5%

Tensile and Hardness Requirements

steel grade	type	total elongation under load (%)	yield strength (Mpa)		tensile strength (Mpa) min	hardness max
steel grade	type	total elongation under load (%)	min	max	HRC	HBW
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	-	-
M65	-	0.5	448	586	586	22	235
L80	1	0.5	552	655	655	23	241
L80	9 Cr	0.5	552	655	655	23	241
L80	13 Cr	0.5	552	655	655	23	241
C90	1	0.5	621	724	689	25.4	255
P110	-	0.6	758	965	862	-	-

API Spec 5CT – Specification 5CT/ISO 11960, Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells

Chemical Composition, Mass Fraction(%)

steel grade	type	C		Mn		Mo		Cr		Ni Max	Cu Max	P Max	S Max	Si Max
steel grade	type	Min	Max	Min	Max	Min	Max		Max					Si Max
H40	-	-	-	-	-	-	-	-	-	-	-	0.030	0.030	-
J55	-	-	-	-	-	-	-	-	-	-	-	0.030	0.030	-
K55	-	-	-	-	-	-	-	-	-	-	-	0.030	0.030	-
N80	1	-	-	-	-	-	-	-	-	-	-	0.030	0.030	-
N80	Q	-	-	-	-	-	-	-	-	-	-	0.030	0.030	-
M65	-	-	-	-	-	-	-	-	-	-	-	0.030	0.030	-
L80	1	-	0.43	-	1.90	-	-	-	-	0.25	0.35	0.030	0.030	0.45
L80	9 Cr	-	0.15	0.30	0.60	0.90	1.10	8.00	10.0	0.50	0.25	0.020	0.010	1.00
L80	13 Cr	0.15	0.22	0.25	1.00	-	-	12.0	14.0	0.50	0.25	0.020	0.010	1.00
C90	1	-	0.35	-	1.20	0.25	0.85	-	1.50	0.99	-	0.020	0.010	-
P110	-	-	-	-	-	-	-	-	-	-	-	0.030	0.030	-
Q125	1	-	0.35	-	1.35	-	0.85	-	1.50	0.99	-	0.020	0.010	-

Note： If the wall thickness is less than 17.78mm, the molybdenum content of the C90-1 steel grade has no lower limit.

Mechanical properties of casing pipe

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	-	-

Manufacturing process of API casing

Steel ingot heating → hydraulic punching → reheating → extension → periodic rolling → reheating → sizing → cooling → straightening → pipe cutting → inspection

1. An annular heating furnace is required for ingot heating;

2. Punching and reheating with the hydraulic press;

3. The oil casing plant uses a two-roller guide plate extension machine for extension;

4. Re-use a disc heating furnace for periodic rolling, and use a non-entry furnace for reheating, cooling, straightening, pipe cutting, and inspection.