API Casing

What is API casing

There are seamless and welded steel pipes established the API casing. It's an important part of the oil drilling process. It is produced according to the API 5CT standard. It is most often used in underground construction projects to encase or protect utility lines from being damaged. It is widely used in cement projects to serve as the structural retainer for the wall of oil and gas wells or wellbore. API casing is an integral part of the oil drilling and completion process. API casing with a good structure and strength to the walls of the good hole so that it doesn't collapse on itself. It ensures that there is no seepage of oil or natural gas is out of the good hole as these are brought to the surface. It is inserted into a wellbore and cemented to protect both subsurface formations and the wellbore from collapsing and allow drilling fluid to circulate and extract.

Size of API casing

API casing length

API Casing Length:

API 5CT Casing

Range 1

Range 2

Range 3

4.88~7.62

7.62~10.36

10.36~14.63

API casing dimension

API Casing 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		11.1	-	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	6.2	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		12.7	-	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;

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.

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Standard of API casing

API 5L, API 5CT, ASTM 53, EN10217, DIN 2458. IS 3589, JIS G3452, BS1387

Application of API casing

Oil well extracting
Borehole
Borewell

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