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OCTG Casing Pipe Size Chart

Keywords: OCTG casing size, casing pipe size chart, casing pipe weight chart, casing diameter and thickness

What is OCTG casing pipe?

OCTG casing pipe stands for "Oil Country Tubular Goods" and refers to a range of seamless rolled products such as drill pipe, casing and tubing used in drilling and producing oil and gas. Casing pipe is used to line the walls of a borehole to prevent collapse and to separate different layers of soil or rock. These pipes are made from various grades of steel and are designed to withstand the high pressures and corrosive environments encountered in oil and gas well operations.

What are OCTG casing pipe sizes?

The size of OCTG casing pipe is specified by its outer diameter and wall thickness. These sizes are usually standardized according to American Petroleum Institute (API) standards. Common OCTG casing sizes range from 4 1/2 inches to 20 inches outer diameter, with varying wall thicknesses to accommodate different well depths and pressure requirements.

For example, a common OCTG casing pipe size might be specified as a "7" (7.00 inches outer diameter) with its specific wall thickness specified in pounds per foot or millimeters. The exact size and specifications of the casing depend on the specific drilling conditions, well design, and regulatory requirements for oil and gas operations.

This text will show the normal casing size table, you can get detailed information from the casing size table below.

Lables		Outside diameter	Nominal diameter	Wall thickness	Inside	Drift	Calculated mass C
					diameter	diameter	Plain End	Mass gain or loss due to end finishing (lb)
					diameter			Round thread		Buttress thread
1	2	D (in)	lb/ft	t (in)	d (in)	in	lb/ft	Short	Long	RC	SCC
1	2	3	4	5	6	7	8	9	10	11	12
4 1/2	9.5	4.5	9.5	0.205	4.09	3.965	9.41	4.2
4 1/2	10.5	4.5	10.5	0.224	4.052	3.927	10.24	3.8		5	2.56
4 1/2	11.6	4.5	11.6	0.25	4	3.875	11.36	3.4	3.8	4.6	2.16
4 1/2	13.5	4.5	13.5	0.29	3.92	3.795	13.05		3.2	4	1.56
4 1/2	15.1	4.5	15.1	0.337	3.826	3.701	15		2.8	3.2	0.76
5	11.5	5	11.5	0.22	4.56	4.435	11.24	5.4
5	13	5	13	0.253	4.494	4.369	12.84	4.8	5.8	6.6	2.42
5	15	5	15	0.296	4.408	4.283	14.88	4.2	5.2	5.8	1.62
5	18	5	18	0.362	4.276	4.151	17.95		4.2	4.4	0.22
5	21.4	5	21.4	0.437	4.126	4.001	21.32		2.95	2.46	-1.72
5	23.2	5	23.2	0.478	4.044	3.919	23.11		2.3	2.05	-2.09
5	24.1	5	24.1	0.5	4	3.875	24.05		1.95	1.24	-2.94
5 1/2	14	5.5	14	0.244	5.015	4.887	13.71	5.4
5 1/2	15.5	5.5	15.5	0.275	4.95	4.825	15.36	4.8	5.8	6.4	2.1
5 1/2	17	5.5	17	0.304	4.892	4.767	16.89	4.4	5.4	5.8	1.5
5 1/2	20	5.5	20	0.361	4.778	4.653	19.83		4.4	4.6	0.3
5 1/2	23	5.5	23	0.415	4.67	4.545	22.56		3.2	3.4	0.9
5 1/2	26.8	5.5	26.8	0.5	4.5	4.375	26.72
5 1/2	29.7	5.5	29.7	0.562	4.376	4.251	29.67
5 1/2	32.6	5.5	32.6	0.625	4.25	4.125	32.57
5 1/2	35.3	5.5	35.3	0.687	4.126	4.001	35.35
5 1/2	38	5.5	38	0.75	4	3.875	38.08
5 1/2	40.5	5.5	40.5	0.812	3.876	3.751	40.69
5 1/2	43.1	5.5	43.1	0.875	3.75	3.625	43.26
6 5/8	20	6.625	20	0.288	6.049	5.924	19.51	11	13.6	14.4	2.38
6 5/8	24	6.625	24	0.352	5.921	5.796	23.6	9.6	12	12.6	0.58
6 5/8	28	6.625	28	0.417	5.791	5.666	27.67		10.2	10.6	-1.42
6 5/8	32	6.625	32	0.475	5.675	5.55	31.23		8.8	9	-3.02
7	17	7	17	0.231	6.538	6.413	16.72	10
7	20	7	20	0.272	6.456	6.331	19.56	9.4
7	23	7	23	0.317	6.366	6.25	22.65	8	10.4	11	1.6
7	23	7	23	0.317	6.366	6.241	22.65	8	10.4	11	1.6
7	26	7	26	0.362	6.276	6.151	25.69	7.2	9.4	9.6	0.2
7	29	7	29	0.408	6.184	6.059	28.75		8	8.2	1.2
7	32	7	32	0.453	6.094	6	31.7		6.6	6.8	2.6
7	32	7	32	0.453	6.094	5.969	31.7		6.6	6.8	2.6
7	35	7	35	0.498	6.004	5.879	34.61		5.6	5.6	3.8
7	38	7	38	0.54	5.92	5.795	37.29		4.4	4.2	5.2
7	42.7	7	42.7	0.625	5.75	5.625	42.59
7	46.4	7	46.4	0.687	5.625	5.5	46.36
7	50.1	7	50.1	0.75	5.5	5.375	50.11
7	53.6	7	53.6	0.812	5.376	5.251	53.71
7	57.1	7	57.1	0.875	5.25	5.125	57.29
7 5/8	24	7.625	24	0.3	7.025	6.9	23.49	15.8
7 5/8	26.4	7.625	26.4	0.328	6.969	6.844	25.59	15.2	19	20.6	6.21
7 5/8	29.7	7.625	29.7	0.375	6.875	6.75	29.06		17.4	18.8	4.41
7 5/8	33.7	7.625	33.7	0.43	6.765	6.64	33.07		15.8	17	2.61
7 5/8	39	7.625	39	0.5	6.625	6.5	38.08		13.6	14.6	0.21
7 5/8	42.8	7.625	42.8	0.562	6.501	6.376	42.43		12.01	11.39	-3.01
7 5/8	45.3	7.625	45.3	0.595	6.435	6.31	44.71		11.04	11.04	-3.36
7 5/8	47.1	7.625	47.1	0.625	6.375	6.25	46.77		10.16	9.23	-5.17
7 5/8	51.2	7.625	51.2	0.687	6.251	6.126	50.95
7 5/8	55.3	7.625	55.3	0.75	6.125	6	55.12
7 3/4	46.1	7.75	46.1	0.595	6.56	6.5	45.51
7 3/4	46.1	7.75	46.1	0.595	6.56	6.435	45.51
8 5/8	24	8.625	24	0.264	8.097	7.972	23.6	23.6
8 5/8	28	8.625	28	0.304	8.017	7.892	27.04	22.2
8 5/8	32	8.625	32	0.352	7.921	7.875	31.13	20.8	27.6	28.3	6.03
8 5/8	32	8.625	32	0.352	7.921	7.796	31.13	20.8	27.6	28.2	6.03
8 5/8	36	8.625	36	0.4	7.825	7.7	35.17	19.4	25.6	26.2	4.03
8 5/8	40	8.625	40	0.45	7.725	7.625	39.33		23.8	24.2	2.03
8 5/8	40	8.625	40	0.45	7.725	7.6	39.33		23.8	24.2	2.03
8 5/8	44	8.625	44	0.5	7.625	7.5	43.43		21.8	22.2	0.03
8 5/8	49	8.625	49	0.557	7.511	7.286	48.04		19.6	19.8	-2.37
9 5/8	32.3	9.625	32.3	0.312	9.001	8.845	31.06	24.4
9 5/8	36	9.625	36	0.352	8.921	8.876	34.89	23	32	31	6.48
9 5/8	40	9.625	40	0.395	8.835	8.75	38.97	21.4	30	29	4.48
9 5/8	40	9.625	40	0.395	8.835	8.679	38.97	21.4	30	29	4.48
9 5/8	43.5	9.625	43.5	0.435	8.755	8.599	42.73		28.2	27.2	2.68
9 5/8	47	9.625	47	0.472	8.681	8.525	46.18		26.6	25.6	1.08
9 5/8	53.5	9.625	53.5	0.545	8.535	8.5	52.9		23.4	22.4	-2.12
9 5/8	53.5	9.625	53.5	0.545	8.535	8.379	52.9		23.4	22.4	-2.12
9 5/8	58.4	9.625	58.4	0.595	8.435	8.375	57.44		21.5	20.13	-4.4
9 5/8	58.4	9.625	58.4	0.595	8.435	8.279	57.44		21.5	20.13	-4.4
9 5/8	59.4	9.625	59.4	0.609	8.407	8.251	58.7
9 5/8	64.9	9.625	64.9	0.672	8.281	8.125	64.32
9 5/8	70.3	9.625	70.3	0.734	8.157	8.001	69.76
9 5/8	75.6	9.625	75.6	0.797	8.031	7.875	75.21
10 3/4	32.75	10.75	32.75	0.279	10.192	10.036	31.23	29
10 3/4	40.5	10.75	40.5	0.35	10.05	9.894	38.91	26.4		34.4	7.21
10 3/4	45.5	10.75	45.5	0.4	9.95	9.875	44.26	24.4		31.8	4.61
10 3/4	45.5	10.75	45.5	0.4	9.95	9.794	44.26	24.4		31.8	4.61
10 3/4	51	10.75	51	0.45	9.85	9.694	49.55	22.6		29.4	2.21
10 3/4	55.5	10.75	55.5	0.495	9.76	9.625	54.26	20.8		27	-0.19
10 3/4	55.5	10.75	55.5	0.495	9.76	9.604	54.26	20.8		27	-0.19
10 3/4	60.7	10.75	60.7	0.545	9.66	9.504	59.45	18.8		24.4
10 3/4	65.7	10.75	65.7	0.595	9.56	9.404	64.59	16.8		22
10 3/4	73.2	10.75	73.2	0.672	9.406	9.25	72.4
10 3/4	79.2	10.75	79.2	0.734	9.282	9.126	78.59
10 3/4	85.3	10.75	85.3	0.797	9.156	9	84.8
11 3/4	42	11.75	42	0.333	11.084	11	40.64	29.6
11 3/4	42	11.75	42	0.333	11.084	10.928	40.64	29.6
11 3/4	47	11.75	47	0.375	11	10.844	45.6	27.6		35.8
11 3/4	54	11.75	54	0.435	10.88	10.724	52.62	25		32.4
11 3/4	60	11.75	60	0.489	10.772	10.625	58.87	22.6		29.6
11 3/4	60	11.75	60	0.489	10.772	10.616	58.87	22.6		29.6
11 3/4	65	11.75	65	0.534	10.682	10.625	64.03
11 3/4	65	11.75	65	0.534	10.682	10.625	64.03
11 3/4	71	11.75	71	0.582	10.586	10.43	69.48
13 3/8	48	13.375	48	0.33	12.715	12.559	46.02	33.2
13 3/8	54.5	13.375	54.5	0.38	12.615	12.459	52.79	30.8		40.2
13 3/8	61	13.375	61	0.43	12.515	12.359	59.5	28.4		36.8
13 3/8	68	13.375	68	0.48	12.415	12.259	66.17	25.8		33.6
13 3/8	72	13.375	72	0.514	12.347	12.25	70.67	24.2		31.6
13 3/8	72	13.375	72	0.514	12.347	12.191	70.67	24.2		31.6
16	65	16	65	0.375	15.25	15.062	62.64	42.6
16	75	16	75	0.438	15.124	14.936	72.86	38.2		45.6
16	84	16	84	0.495	15.01	14.822	82.05	34.2		39.6
16	109	16	109	0.656	14.688	14.5	107.6
18 5/8	87.5	18.625	87.5	0.435	17.755	17.567	84.59	73.6		86.4
20	94	20	94	0.438	19.124	18.936	91.59	47	61.2	54.8
20	106.5	20	106.5	0.5	19	18.812	104.23	41.6	54.8	48.4
20	133	20	133	0.635	18.73	18.542	131.45	30	40.6	35.2

Elements of Steel Pipe Size:
A complete description of steel pipe size includes the outside diameter (OD), wall thickness (WT), and pipe length (usually 20 feet 6 meters or 40 feet 12 meters).

Key Notes on Casing Size:
OD (Outside Diameter): The outer diameter of the casing. It determines the size of the hole required for installation.
Weight (lbs/ft): Describes the linear weight of the casing, which varies based on wall thickness and steel grade.
Wall Thickness: Affects the ability of the casing to withstand pressure and collapse forces.
ID (Inside Diameter): Affects the flow rate of the well.

If you are considering casing for a specific application, make sure to check its compatibility with the drilling equipment and project requirements.

With these elements, we can calculate the weight of the pipe, the pressure the pipe can withstand, and the cost per foot or meter. That's why we always need to know the correct pipe size.

Hunan Standard Steel Co., Ltd (HSCO) provides OCTG casing, tubing, drill pipe and couplings of various specifications and materials. If you need any, please contact us: info@hu-steel.com

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