Oil Country Tubular Goods (OCTG)

API 5CT J55/K55 BTC Seamless Steel Casing Pipe for Oil Wells

High Collapse Resistance
API-Standard Threading
Ensures Wellbore Integrity

Casing pipe is an essential structural component of a well, installed in the wellbore to keep it stable, preventing the borehole walls from collapsing, and isolating geologic formations to prevent fluid loss and cross-contamination. Our high strength API 5CT casing will provide long-term well integrity even at extreme downhole conditions!

Quick Details

Parameter	Details
Product Name	OCTG Casing Pipe
Standard	API 5CT
Steel Grade	J55, K55, N80, L80, C90, T95, P110
Outer Diameter (OD)	4 1/2" - 20" (114.3mm - 508mm)
Connection Type	BTC (Buttress Thread), LTC (Long Round-Thread), STC (Short Round-Thread), Premium Connections

Product Description

Advantages

Specifications

Main Application

Detailed Description of Casing Pipe

Casing, the primary structural support and stability for a wellbore, performs the following functions: 1) stabilizing the wellbore, 2) protecting unconfined water sands from contamination, 3) isolating undesirable water from producing formations, and 4) controlling and restricting well pressures during drilling, production, and workover operations. Casing is installed in sections, or "strings", each subsequently smaller in diameter and cemented securely in place. Casing strings include the Conductor, Surface, Intermediate, and Production Casing, with a unique purpose for each string to help the well become robust and safe. When designing the casing, careful consideration is given to casing grade, casing size, and casing weight. This is important in consideration of expected hole conditions, acting pressures, and depth of target. Our casing pipes are designed to yield both high collapse pressures, burst pressures, and tensile loads, sufficiently protecting the performance of the well.

Key Parameters for OCTG Casing Pipe

Parameter	Details
Manufacturing Process	Seamless (SMLS)
Executive Standard	API SPEC 5CT, ISO 11960
Grades	J55, K55, N80Q, L80-1, L80-9Cr, L80-13Cr, C90, T95, P110
Wall Thickness	As per API 5CT standard, varies with OD and weight (lbs/ft)
Length	R1 (4.88-7.62m), R2 (7.62-10.36m), R3 (10.36-14.63m)
Thread Connections	STC (Short Thread), LTC (Long Thread), BTC (Buttress Thread), and various premium, gas-tight connections (e.g., VAM, TenarisHydril)
Inspection	Hydrostatic Test, NDT (UT, MT, EMI), Dimensional Inspection, Thread Inspection

Advantages of Our Casing Pipe

Excellent Collapse Strength: Designed for solid external resistance to rock formations and fluids.

High Burst Resistance: Able to withstand high internal pressures from gas kicks or produced fluids.

Excellent Connection Integrity: Tight tolerance threads which provide secure, leak free connections, where well safety is paramount.

100% Traceable: All pipes are marked, traceable with MTCs to all API international standards.

Key Parameters for OCTG Casing Pipe

Dimensions and Masses for Standard Casing and for Casing Threaded with API Round Thread and Buttress Thread
Labels		Outside Diameter	Nominal Linear Mas5 T&b,c	Wall Thick- ness	Inside Diameter	Drift Diameter	Calculated Mass
							Plain- end	enm Mass Gain or Loss Due to End
							Plain- end	Round Thread		Buttress Thread
		D mm	kg/m	mm	D mm	mm	Wpe kg/m	Short	Long	RC	SCC
4½	9.5	114.3	14.38	5.21	103.88	100.7	14.02	3.64		-	-
4½	10.5	114.3	15.73	5.69	102.92	99.74	15.24	3.33	-	4.53	1.12
4½	11.6	114.3	17.38	6.35	101.6	98.42	16.91	3.18	3.61	4.32	0.91
4½	13.5	114.3	19.87	7.37	99.56	96.38	19.44	-	3.35	4.07	0.6
4½	15.1	114.3	22.69	8.56	97.18	94	22.32	-	3.53	3.64	0.24
5	11.5	127	17.19	5.59	115.82	112.64	16.74	4.32	-	-	-
5	13	127	19.69	6.43	114.14	110.96	19.12	4	4.85	5.38	1.24
5	15	127	22.69	7.52	111.96	108.78	22.16	3.71	4.51	4.99	0.61
5	18	127	27.19	9.19	108.62	105.44	26.7	-	4.52	4.4	0.22
5	21.4	127	32.13	11.1	104.8	101.62	31.73	-	3.45	3.76	-0.62
5	23.2	127	34.76	12.14	102.72	99.54	34.39	-	3.15	3.42	-0.96
5	24.1	127	36.15	12.7	101.6	98.42	35.8	-	2.99	3.23	-1.14
5½	14	139.7	20.91	6.2	127.3	124.12	20.41	4.6	-	-	-
5½	15.5	139.7	23.48	6.98	125.74	122.56	22.85	4.36	5.26	5.71	0.87
5½	17	139.7	25.72	7.72	124.26	121.08	25.13	4.14	5.31	5.41	0.58
5½	20	139.7	30.05	9.17	121.36	118.18	29.52	-	4.5	4.84	0.45
5½	23	139.7	34.05	10.54	118.62	115.44	33.57	-	4.37	4.31	-0.52
5½	26.8	139.7	40.15	12.7	114.3	111.12	39.78	-	-	-	-
5½	29.7	139.7	44.47	14.27	111.16	107.98	44.14	-	-	-	-
5½	32.6	139.7	48.74	15.88	107.94	104.76	48.49	-	-	-	-
5½	35.3	139.7	52.8	17.45	104.8	101.62	52.61	-	-	-	-
5½	38	139.7	56.82	19.05	101.6	98.42	56.68	-	-	-	-
5½	40.5	139.7	60.64	20.62	98.46	95.28	60.55	-	-	-	-
5½	43.1	139.7	64.41	22.22	95.26	92.08	64.38	-	-	-	-
6⅝	20	168.28	29.76	7.32	153.64	150.46	29.06	5.58	6.23	6.35	0.89
6⅝	24	168.28	35.72	8.94	150.4	147.22	35.13	4.42	5.48	5.52	0.68
6⅝	28	168.28	41.67	10.59	147.1	143.92	41.18	-	4.73	4.71	-0.75
6⅝	32	168.28	47.62	12.06	144.16	140.98	46.46	-	4.73	4	-1.46
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	23	177.8	34.67	8.05	161.7	158.75	33.7	6.26	7.94	8.28	0.58
7	23	177.8	34.67	8.05	161.7	158.52	33.7	6.26	7.94	8.28	0.58
7	26	177.8	39.14	9.19	159.42	156.24	38.21	5.79	7.37	7.65	-0.54
7	29	177.8	43.6	10.36	157.08	153.9	42.78	-	6.79	7.13	-0.69
7	32	177.8	47.92	11.51	154.78	152.4	47.2	-	6.23	6.4	-1.31
7	32	177.8	47.92	11.51	154.78	151.6	47.2	-	6.23	6.4	-1.31
7	35	177.8	52.09	12.65	152.5	149.32	51.52	-	5.68	5.79	-1.91
7	38	177.8	56.1	13.72	150.36	147.18	55.52	-	5.18	5.24	-2.47
7	42.7	177.8	63.84	15.88	146.04	142.86	63.41	-	-	-	-
7	46.4	177.8	69.35	17.45	142.9	139.72	69.01	-			-
7	50.1	177.8	74.85	19.05	139.7	136.52	74.58	-	-	-	-
7	53.6	177.8	80.21	20.62	136.56	133.38	79.93	-	-	-	-
7	57.1	177.8	85.42	22.22	133.36	130.18	85.25	-	-	-	-
7⅝	24	193.68	35.72	7.62	178.44	175.26	34.96	7.11	-	-	-
7⅝	26.4	193.68	39.29	8.33	177.02	173.84	38.08	6.78	8.58	9.12	2.59
7⅝	29.7	193.68	44.2	9.52	174.64	171.46	43.24	-	7.91	8.38	1.84
7⅝	33.7	193.68	50.15	10.92	171.84	168.66	49.22	-	7.13	7.51	0.98
7⅝	39	193.68	58.04	12.7	168.28	165.1	56.68		6.16	6.44	-0.1
7⅝	42.8	193.68	63.69	14.27	165.14	161.96	63.14	-	5.32	5.5	-1.03
7⅝	45.3	193.68	67.41	15.11	163.46	160.28	66.54	-	4.87	5.01	-1.52
7⅝	47.1	193.68	70.09	15.88	161.92	158.74	69.63	-	4.48	4.57	-1.96
7⅝	51.2	193.68	76.19	17.45	158.78	155.6	75.84	-	-	-	-
7⅝	55.3	193.68	82.3	19.05	155.58	152.4	82.04	-	-	-	-
7¾	46.1	196.85	68.6	15.11	166.63	165.1	67.72	-	-	-	-
7¾	46.1	196.85	68.6	15.11	166.63	163.45	67.72	-	-	-	-
8⅝	24	219.08	35.72	6.71	205.66	202.48	35.14	10.93	-		-
8⅝	28	219.08	41.67	7.72	203.64	200.46	40.24	10.07	--	--	-
8⅝	32	219.08	47.62	8.94	201.2	200.02	46.33	9.39	12.44	12.57	2.51
8⅝	32	219.08	47.62	8.94	201.2	198.02	46.33	9.39	12.44	12.57	2.51
8⅝	36	219.08	53.57	10.16	198.76	195.58	52.35	8.72	11.6	11.68	1.62
8⅝	40	219.08	59.53	11.43	196.22	193.68	58.53	-	10.73	10.77	0.71
8⅝	40	219.08	59.53	11.43	196.22	193.04	58.53	-	10.73	10.77	0.71
8⅝	44	219.08	65.48	12.7	193.68	190.5	64.64	-	9.88	9.87	-0.2
8⅝	49	219.08	72.92	14.15	190.78	187.6	71.51	-	8.88	8.85	-1.21
9⅝	32.3	244.48	48.07	7.92	228.6	224.66	46.2	11	-	-	-
9⅝	36	244.48	53.57	8.94	226.6	222.63	51.93	10.36	14.48	13.87	2.74
9⅝	40	244.48	59.53	10.03	224.4	222.25	57.99	9.69	13.59	12.97	1.84
9⅝	40	244.48	59.53	10.03	224.4	220.45	57.99	9.69	13.59	12.97	1.84
9⅝	43.5	244.48	64.74	11.05	222.4	218.41	63.61	-	12.78	12.15	1.01
9⅝	43.5	244.48	64.74	11.05	222.4	218.41	63.61	-	12.84	12.15	1.01
9⅝	47	244.48	69.94	11.99	220.5	216.54	68.75	-	12.03	11.39	0.25
9⅝	47	244.48	69.94	11.99	222.5	216.54	68.75	-	12.09	11.39	0.25
9⅝	53.5	244.48	79.62	13.84	216.8	215.90	78.72	-	10.57	9.92	-1.22
9⅝	53.5	244.48	79.62	13.84	216.8	215.9	78.72	-	10.63	9.92	-1.22
9⅝	53.5	244.48	79.62	13.84	216.8	212.83	78.72	-	10.57	9.92	-1.22
9⅝	53.5	244.48	79.62	13.84	216.8	212.83	78.72	-	10.63	9.92	-1.22
9⅝	58.4	244.48	86.91	15.11	214.25	212.72	85.47	-	9.58	8.92	-2.22
9⅝	58.4	244.48	86.91	15.11	214.25	212.72	85.47	-	9.65	8.92	-2.22
9⅝	58.4	244.48	86.91	15.11	214.25	210.29	85.47	-	9.58	8.92	-2.22
9⅝	58.4	244.48	86.91	15.11	214.25	210.29	85.47	-	9.65f	8.92	-2.22
9⅝	59.4	244.48	88.4	15.47	213.5	209.58	87.37	-	-	-	-
9⅝	64.9	244.48	96.58	17.07	210.3	206.38	95.73	-	-
9⅝	70.3	244.48	104.62	18.64	207.2	203.23	103.82	-	-	-	-
9⅝	75.6	244.48	112.51	20.24	204	200.02	111.93	-	-	-	-
10¾	32.75	273.05	48.74	7.09	258.9	254.91	46.5	13.94		-	-
10¾	40.5	273.05	60.27	8.89	255.3	251.31	57.91	11.91		15.38	3.03
10¾	45.5	273.05	67.71	10.16	252.7	250.82	65.87	11		14.21	1.86
10¾	45.5	273.05	67.71	10.16	252.7	248.77	65.87	11	-	14.21	1.86
10¾	51	273.05	75.9	11.43	250.2	246.23	73.75	10.11		13.05	0.7
10¾	51	273.05	75.9	11.43	250.2	246.33	73.75	10.16	-	13.05	0.7
10¾	55.5	273.05	82.59	12.57	247.9	244.48	80.75	9.3	-	12.25	-0.09
10¾	55.5	273.05	82.59	12.57	247.9	244,48	80.75	9.35		12.01	-0.34
10¾	55.5	273.05	82.59	12.57	247.9	243.94	80.75	9.3	-	12.25	-0.09
10¾	55.5	273.05	82.59	12.57	247.9	243.94	80.75	9.35		12.01	-0.34
10¾	60.7	273.05	90.33	13.84	245.4	241.4	88.47	8.42	-	11.07
10¾	60.7	273.05	90.33	13.84	245.4	241.4	88.47	8.47		10.87
10¾	65.7	273.05	97.77	15.11	242.8	238.86	96.12	7.54	-	9.98	-
10¾	65.7	273.05	97.77	15.11	242.8	238.86	96.12	7.60		9.74
10¾	73.2	273.05	108.93	17.07	238.9	234.95	107.76	-	-	-	-
10¾	79.2	273.05	117.86	18.64	235.8	231.8	116.95	-			-
10¾	85.3	273.05	126.94	20.24	232.6	228.6	126.19	-	-	-	-
11¾	42	298.45	62.5	8.46	281.5	279.4	62.56	13.27	-	-	-
11¾	42	298.45	62.5	8.46	281.5	277.5	62.56	13.27	-		-
11¾	47	298.45	69.94	9.52	279.41	275.44	67.83	12.42	-	16.04	-
11¾	54	298.45	80.36	11.05	276.4	272.39	78.32	11.23		14.5	-
11¾	60	298.45	89.29	12.42	273.6	269.88	87.61	10.17	-	13.12	-
11¾	60	298.45	89.29	12.42	273.6	269.88	87.61	9.77	-	13.12	-
11¾	60	298.45	89.29	12.42	273.6	269.65	87.61	10.17	-	13.12	-
11¾	60	298.45	89.29	12.42	273.6	269.65	87.61	9.77	-	13.12	-
11¾	65	298.45	96.73	13.56	271.3	269.88	95.27	-		-
11¾	65	298.45	96.73	13.56	271.3	267.36	95.27	-	-	-	-
11¾	71	298.45	105.66	14.78	268.9	264.92	103.4	-	-	-	-
13⅜	48	339.72	71.43	8.38	322.96	318.99	68.48	15.04	-	-	-
13⅜	54.5	339.72	81.1	9.65	320.42	316.45	78.55	13.88	-	17.91	-
13⅜	61	339.72	90.78	10.92	317.88	313.91	88.55	12.74	-	16.44	-
13⅜	68	339.72	101.19	12.19	315.34	311.37	98.46	11.61		14.97	-
13⅜	68	339.72	101.19	12.19	315.34	311.37	98.46	11.67		14.97	-
13⅜	72	339.72	107.15	13.06	313.6	311.15	105.21	10.98	-	14.33	-
13⅜	72	339.72	107.15	13.06	313.6	311.15	105.21	10.91		13.98	-
13⅜	72	339.72	107.15	13.06	313.6	309.63	105.21	10.98	-	14.33	-
13⅜	72	339.72	107.15	13.06	313.6	309.63	105.21	10.91		13.98	-
16	65	406.4	96.73	9.53	387.4	382.57	96.73	18.59	-	-	-
16	75	406.4	111.61	11.13	384.1	379.37	108.49	16.66	-	20.13	-
16	84	406.4	125.01	12.57	381.3	376.48	122.09	14.92	-	18.11	-
16	109	406.4	162.21	16.66	373.1	368.3	160.13	-	-	-	-
18⅝	87.5	473.08	130.21	11.05	450.98	446.22	125.91	33.6	-	39.25	-
20	94	508	139.89	11.13	485.7	480.97	136.38	20.5	27.11	24.78	-
20	94	508	139.89	11.13	485.7	480.97	136.38	20.61	27.26	24.78	-
20	106.5	508	158.49	12.7	48260	477.82	155.13	18.22	24.27	22	-
20	133	508	197.93	16.13	475.7	470.97	195.66	13.03	17.84	16.02	-

Main Application Areas for Casing Pipe

Casing is used exclusively in the oil and gas drilling industry to:

Support the wellbore: Prevent the surrounding materials from converging into the wellbore.

Isolate formations: Segregate strata or layers in contrast to other layers in order to prevent the movement of fluid from one layer to the next, especially protecting freshwater aquifers.

Provide a pressure path: Allows for the installation of production equipment, as well as drills mud and provides a path for drilling mud and fluids.

Ensure well control: It provides the primary boundary or seal to avoid losses of control – blowouts or uncontrolled releases of oil or gas.