Coiled Tubing for Oil Industry

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What is Coiled Tubing?

What is Coiled Tubing?

Coiled tubing (CT) is a steel pipe that is many kilometers long and coiled on a large diameter drum. It is made up of multiple sections of beveled steel strips that are rolled, shaped, and welded together. This type of pipe has excellent strength, toughness, and continuity, and it may replace conventional oil pipelines in a variety of applications.

During World War II, the Allies solved the problem of cross-sea military oil delivery by constructing 17 special metal pipelines. This method was used to repair oil wells in the early 1960s, paving the way for coiled tubing in the oil industry.

Technical Specifications of Coiled Tubing

Available Materials: Carbon steel & Stainless steel & Titanium alloy

Steel Grade: CT55, CT60, CT70, CT80, CT90, CT100, CT110, SS304, SS316, SS2205, etc.

OD: 19.1mm-88.9mm

WT: A single length of tubing can be made of a single wall thickness or of different wall thicknesses.

Length: ≥61 meters

Coiled Tubing

Grades & Chemical Composition of Coiled Tubing

Steel Grade	C	Mn	P	S	Si	Cr+Mo+Ni+Cu
CT55	≤0.16	≤1.20	≤0.025	≤0.005	≤0.50	0.30-1.50
CT60	≤0.16	≤1.20	≤0.025	≤0.005	≤0.50	0.30-1.50
CT70	≤0.16	≤1.20	≤0.025	≤0.005	≤0.50	0.50-1.80
CT80	≤0.16	≤1.20	≤0.02	≤0.005	≤0.50	0.50-1.80
CT90	≤0.16	≤1.20	≤0.02	≤0.005	≤0.50	0.50-1.80
CT100	≤0.16	≤1.65	≤0.02	≤0.005	≤0.50	0.70-2.00
CT110	≤0.16	≤1.65	≤0.02	≤0.005	≤0.50	0.70-2.00

Mechanical Properties of Coiled Tubing

Steel Grade	Tensile Strength, psi [MPa]	Yield Strength, psi [MPa]	Hardness of Tube and Weld Seam
CT55	≥70000 [483]	55000-65000 [379-448]	≤22 HRC
CT60	≥75000 [517]	60000-70000 [414-483]	≤22 HRC
CT70	≥80000 [552]	70000-80000 [483-552]	≤22 HRC
CT80	≥88000 [607]	80000-90000 [552-620]	≤22 HRC
CT90	≥97000 [669]	90000-100000 [620-689]	≤22 HRC
CT100	≥110000 [758]	≥100000 [689]	≤28 HRC
CT110	≥115000 [793]	≥110000 [758]	≤30 HRC

Features of Coiled Tubing

Lightweight
High strength
Corrosion resistance
Long service life
Continuous operation, no need for frequent connection and disassembly
High mobility

Dimensions of Coiled Tubing

Specification		O.D.	W.T.		Weight per unit length	D/t Radio	I.D.	Mini Test Pressure MPa
Size	WT	O.D.	Specified WT	Mini Thk	Weight per unit length		I.D.	Mini Test Pressure MPa
in.	in.	mm	mm	mm	kg/m		mm	CT50	CT60	CT70	CT80	CT90	CT100	CT110
0.75	0.08	19.1	2	1.9	0.85	9.375	15	60.7	66.2	77.2	88.3	99.3	103.4	103.4
0.75	0.083	19.1	2.1	2	0.88	9.036	14.8	63.1	68.8	80.3	91.8	103.3	103.4	103.4
0.75	0.087	19.1	2.2	2.1	0.92	8.621	14.6	66.6	72.4	84.4	96.5	103.4	103.4	103.4
0.75	0.095	19.1	2.4	2.3	0.99	7.895	14.2	72.8	79.4	92.7	103.4	103.4	103.4	103.4
0.75	0.102	19.1	2.6	2.5	1.05	7.353	13.9	78.5	85.6	99.9	103.4	103.4	103.4	103.4

1	0.075	25.4	1.9	1.8	1.1	13.333	21.6	42.5	46.3	54.1	61.8	69.5	77.2	84.9
1	0.08	25.4	2	1.9	1.17	12.5	21.3	45.5	49.6	57.9	66.2	74.5	82.7	91
1	0.083	25.4	2.1	2	1.21	12.048	21.2	47.3	51.6	60.2	68.8	77.4	86	94.7
1	0.087	25.4	2.2	2.1	1.26	11.494	21	49.8	54.3	63.3	72.4	81.4	90.5	99.5
1	0.095	25.4	2.4	2.3	1.37	10.526	20.6	54.6	59.6	69.5	79.4	89.4	99.3	103.4
1	0.102	25.4	2.6	2.5	1.46	9.804	20.2	58.9	64.2	74.9	85.6	96.3	103.4	103.4
1	0.109	25.4	2.8	2.6	1.55	9.174	19.9	63.1	68.8	80.3	91.8	103.3	103.4	103.4
1	0.118	25.4	3	2.8	1.66	8.475	19.4	66.7	72.8	84.9	97.1	103.4	103.4	103.4
1	0.125	25.4	3.2	3	1.74	8	19.1	71	77.4	90.3	103.3	103.4	103.4	103.4
1	0.134	25.4	3.4	3.2	1.85	7.463	18.6	76.4	83.4	97.3	103.4	103.4	103.4	103.4

1.25	0.075	31.8	1.9	1.8	1.4	16.667	27.9	34	37.1	43.2	49.4	55.6	61.8	68
1.25	0.08	31.8	2	1.9	1.49	15.625	27.7	36.4	39.7	46.3	53	59.6	66.2	72.8
1.25	0.087	31.8	2.2	2.1	1.61	14.368	27.3	39.8	43.4	50.7	57.9	65.1	72.4	79.6
1.25	0.095	31.8	2.4	2.3	1.75	13.158	26.9	43.7	47.7	55.6	63.5	71.5	79.4	87.4
1.25	0.102	31.8	2.6	2.5	1.86	12.255	26.6	47.1	51.4	59.9	68.5	77	85.6	94.2
1.25	0.109	31.8	2.8	2.6	1.98	11.468	26.2	50.5	55.1	64.2	73.4	82.6	91.8	101
1.25	0.118	31.8	3	2.8	2.13	10.593	25.8	53.4	58.2	68	77.7	87.4	97.1	103.4
1.25	0.125	31.8	3.2	3	2.24	10	25.4	56.8	62	72.3	82.6	92.9	103.4	103.4
1.25	0.134	31.8	3.4	3.2	2.38	9.328	24.9	61.2	66.7	77.8	89	100.1	103.4	103.4
1.25	0.145	31.8	3.7	3.5	2.55	8.621	24.4	66.5	72.5	84.6	96.7	103.4	103.4	103.4
1.25	0.156	31.8	4	3.8	2.72	8.013	23.8	71.8	78.4	91.4	103.4	103.4	103.4	103.4
1.25	0.175	31.8	4.4	4.2	2.99	7.143	22.9	81.1	88.4	103.2	103.4	103.4	103.4	103.4

1.5	0.087	38.1	2.2	2.1	1.96	17.241	33.7	33.2	36.2	42.2	48.2	54.3	60.3	66.3
1.5	0.095	38.1	2.4	2.3	2.12	15.789	33.3	36.4	39.7	46.3	53	59.6	66.2	72.8
1.5	0.102	38.1	2.6	2.5	2.27	14.706	32.9	39.2	42.8	49.9	57.1	64.2	71.3	78.5
1.5	0.109	38.1	2.8	2.6	2.41	13.761	32.6	42.1	45.9	53.5	61.2	68.8	76.5	84.1
1.5	0.118	38.1	3	2.8	2.59	12.712	32.1	44.5	48.5	56.6	64.7	72.8	80.9	89
1.5	0.125	38.1	3.2	3	2.73	12	31.8	47.3	51.6	60.2	68.8	77.4	86	94.7
1.5	0.134	38.1	3.4	3.2	2.91	11.194	31.3	51	55.6	64.9	74.1	83.4	92.7	101.9
1.5	0.145	38.1	3.7	3.5	3.13	10.345	30.7	55.4	60.5	70.5	80.6	90.7	100.8	103.4
1.5	0.156	38.1	4	3.8	3.34	9.615	30.2	59.9	65.3	76.2	87.1	98	103.4	103.4
1.5	0.175	38.1	4.4	4.2	3.69	8.571	29.2	67.6	73.7	86	98.3	103.4	103.4	103.4
1.5	0.188	38.1	4.8	4.6	3.92	7.979	28.5	72.8	79.4	92.7	103.4	103.4	103.4	103.4
1.5	0.204	38.1	5.2	5	4.21	7.353	27.7	79.3	86.5	100.9	103.4	103.4	103.4	103.4

1.75	0.095	44.5	2.4	2.3	2.5	18.421	39.6	31.2	34	39.7	45.4	51.1	56.7	62.4
1.75	0.102	44.5	2.6	2.5	2.67	17.157	39.3	33.6	36.7	42.8	48.9	55	61.1	67.3
1.75	0.109	44.5	2.8	2.6	2.85	16.055	38.9	36.1	39.3	45.9	52.4	59	65.6	72.1
1.75	0.118	44.5	3	2.8	3.06	14.831	38.5	38.1	41.6	48.5	55.5	62.4	69.3	76.3
1.75	0.125	44.5	3.2	3	3.23	14	38.1	40.6	44.3	51.6	59	66.4	73.8	81.1
1.75	0.134	44.5	3.4	3.2	3.45	13.06	37.6	43.7	47.7	55.6	63.5	71.5	79.4	87.4
1.75	0.145	44.5	3.7	3.5	3.7	12.069	37.1	47.5	51.8	60.5	69.1	77.7	86.4	95
1.75	0.156	44.5	4	3.8	3.96	11.218	36.5	51.3	56	65.3	74.6	84	93.3	102.6
1.75	0.175	44.5	4.4	4.2	4.39	10	35.6	57.9	63.2	73.7	84.2	94.7	103.4	103.4
1.75	0.188	44.5	4.8	4.6	4.67	9.309	34.9	62.4	68.1	79.4	90.8	102.1	103.4	103.4
1.75	0.204	44.5	5.2	5	5.02	8.578	34.1	68	74.1	86.5	98.8	103.4	103.4	103.4
1.75	0.224	44.5	5.7	5.5	5.44	7.813	33.1	74.9	81.7	95.3	103.4	103.4	103.4	103.4
1.75	0.25	44.5	6.4	6.1	5.97	7	31.8	83.9	91.5	103.4	103.4	103.4	103.4	103.4

2	0.109	50.8	2.8	2.6	3.28	18.349	45.3	31.6	34.4	40.2	45.9	51.6	57.4	63.1
2	0.118	50.8	3	2.8	3.53	16.949	44.8	33.4	36.4	42.5	48.5	54.6	60.7	66.7
2	0.125	50.8	3.2	3	3.73	16	44.5	35.5	38.7	45.2	51.6	58.1	64.5	71
2	0.134	50.8	3.4	3.2	3.98	14.925	44	38.2	41.7	48.6	55.6	62.5	69.5	76.4
2	0.145	50.8	3.7	3.5	4.28	13.793	43.4	41.6	45.3	52.9	60.5	68	75.6	83.1
2	0.156	50.8	4	3.8	4.58	12.821	42.9	44.9	49	57.1	65.3	73.5	81.6	89.8
2	0.175	50.8	4.4	4.2	5.08	11.429	41.9	50.7	55.3	64.5	73.7	82.9	92.1	101.3
2	0.188	50.8	4.8	4.5	5.42	10.638	41.2	53.4	58.2	68	77.7	87.4	97.1	103.4
2	0.204	50.8	5.2	4.9	5.83	9.804	40.4	58.2	63.5	74.1	84.7	95.3	103.4	103.4
2	0.224	50.8	5.7	5.4	6.33	8.929	39.4	64.3	70.2	81.9	93.5	103.4	103.4	103.4
2	0.25	50.8	6.4	6	6.96	8	38.1	72.2	78.8	91.9	103.4	103.4	103.4	103.4
2	0.276	50.8	7	6.6	7.57	7.246	36.8	79.2	86.4	100.8	103.4	103.4	103.4	103.4
2	0.281	50.8	7.1	6.8	7.69	7.117	36.5	80.7	88	102.7	103.4	103.4	103.4	103.4

2.375	0.109	60.3	2.8	2.6	3.93	21.789	54.8	26.6	29	33.8	38.6	43.5	48.3	53.1
2.375	0.118	60.3	3	2.8	4.24	20.127	54.3	28.1	30.7	35.8	40.9	46	51.1	56.2
2.375	0.125	60.3	3.2	3	4.47	19	54	29.9	32.6	38	43.5	48.9	54.3	59.8
2.375	0.134	60.3	3.4	3.2	4.78	17.724	53.5	32.2	35.1	41	46.8	52.7	58.5	64.4
2.375	0.145	60.3	3.7	3.5	5.14	16.379	53	35	38.2	44.5	50.9	57.3	63.6	70
2.375	0.156	60.3	4	3.8	5.51	15.224	52.4	37.8	41.2	48.1	55	61.9	68.7	75.6
2.375	0.175	60.3	4.4	4.2	6.13	13.571	51.4	42.7	46.5	54.3	62.1	69.8	77.6	85.3
2.375	0.188	60.3	4.8	4.5	6.54	12.633	50.8	45	49	57.2	65.4	73.6	81.8	89.9
2.375	0.204	60.3	5.2	4.9	7.05	11.642	50	49	53.5	62.4	71.3	80.3	89.2	98.1
2.375	0.224	60.3	5.7	5.4	7.67	10.603	48.9	54.2	59.1	68.9	78.8	88.6	98.5	103.4
2.375	0.25	60.3	6.4	6	8.45	9.5	47.6	60.8	66.3	77.4	88.4	99.5	103.4	103.4
2.375	0.276	60.3	7	6.6	9.22	8.605	46.3	66.7	72.7	84.9	97	103.4	103.4	103.4
2.375	0.281	60.3	7.1	6.8	9.36	8.452	46.1	68	74.1	86.5	98.8	103.4	103.4	103.4
2.375	0.3	60.3	7.6	7.2	9.9	7.917	45.1	72.8	79.4	92.7	103.4	103.4	103.4	103.4

2.625	0.145	66.7	3.7	3.5	5.72	18.103	59.3	31.7	34.5	40.3	46.1	51.8	57.6	63.3
2.625	0.156	66.7	4	3.8	6.13	16.827	58.8	34.2	37.3	43.5	49.8	56	62.2	68.4
2.625	0.175	66.7	4.4	4.2	6.82	15	57.8	38.6	42.1	49.1	56.1	63.2	70.2	77.2
2.625	0.188	66.7	4.8	4.5	7.29	13.963	57.1	40.7	44.4	51.8	59.2	66.6	74	81.4
2.625	0.204	66.7	5.2	4.9	7.86	12.868	56.3	44.4	48.4	56.5	64.6	72.6	80.7	88.8
2.625	0.224	66.7	5.7	5.4	8.56	11.719	55.3	49	53.5	62.4	71.3	80.2	89.1	98
2.625	0.25	66.7	6.4	6	9.45	10.5	54	55	60	70	80	90	100	103.4
2.625	0.276	66.7	7	6.6	10.32	9.511	52.7	60.3	65.8	76.8	87.7	98.7	103.4	103.4
2.625	0.281	66.7	7.1	6.8	10.48	9.342	52.4	61.5	67.1	78.3	89.4	100.6	103.4	103.4
2.625	0.3	66.7	7.6	7.2	11.1	8.75	51.4	65.9	71.9	83.8	95.8	103.4	103.4	103.4

2.875	0.134	73	3.4	3.2	5.84	21.455	66.2	26.6	29	33.8	38.7	43.5	48.3	53.2
2.875	0.145	73	3.7	3.5	6.3	19.828	65.7	28.9	31.5	36.8	42.1	47.3	52.6	57.8
2.875	0.156	73	4	3.8	6.75	18.429	65.1	31.2	34.1	39.8	45.4	51.1	56.8	62.5
2.875	0.175	73	4.4	4.2	7.52	16.429	64.1	35.2	38.4	44.9	51.3	57.7	64.1	70.5
2.875	0.188	73	4.8	4.5	8.04	15.293	63.5	37.1	40.5	47.3	54	60.8	67.5	74.3
2.875	0.204	73	5.2	4.9	8.67	14.093	62.7	40.5	44.2	51.6	58.9	66.3	73.7	81
2.875	0.224	73	5.7	5.4	9.45	12.835	61.6	44.7	48.8	56.9	65.1	73.2	81.3	89.5
2.875	0.25	73	6.4	6	10.44	11.5	60.3	50.2	54.8	63.9	73.1	82.2	91.3	100.5
2.875	0.276	73	7	6.6	11.41	10.417	59	55.1	60.1	70.1	80.1	90.1	100.1	103.4
2.875	0.281	73	7.1	6.8	11.6	10.231	58.8	56.1	61.2	71.4	81.7	91.9	102.1	103.4
2.875	0.3	73	7.6	7.2	12.29	9.583	57.8	60.1	65.6	76.5	87.5	98.4	103.4	103.4

3.25	0.145	82.6	3.7	3.5	7.16	22.414	75.2	25.6	27.9	32.6	37.2	41.9	46.5	51.2
3.25	0.156	82.6	4	3.8	7.68	20.833	74.6	27.6	30.1	35.2	40.2	45.2	50.2	55.3
3.25	0.175	82.6	4.4	4.2	8.56	18.571	73.7	31.2	34	39.7	45.3	51	56.7	62.4
3.25	0.188	82.6	4.8	4.5	9.16	17.287	73	32.9	35.8	41.8	47.8	53.8	59.7	65.7
3.25	0.204	82.6	5.2	4.9	9.89	15.931	72.2	35.8	39.1	45.6	52.1	58.7	65.2	71.7
3.25	0.224	82.6	5.7	5.4	10.78	14.509	71.2	39.6	43.2	50.4	57.6	64.8	72	79.2
3.25	0.25	82.6	6.4	6	11.93	13	69.9	44.4	48.5	56.5	64.6	72.7	80.8	88.9
3.25	0.276	82.6	7	6.6	13.06	11.775	68.5	48.7	53.2	62	70.9	79.7	88.6	97.5
3.25	0.281	82.6	7.1	6.8	13.27	11.566	68.3	49.7	54.2	63.2	72.2	81.3	90.3	99.3
3.25	0.3	82.6	7.6	7.2	14.08	10.833	67.3	53.2	58	67.7	77.4	87.1	96.7	103.4

3.5	0.156	88.9	4	3.8	8.3	22.436	81	25.7	28	32.7	37.3	42	46.6	51.3
3.5	0.175	88.9	4.4	4.2	9.26	20	80	29	31.6	36.8	42.1	47.4	52.6	57.9
3.5	0.188	88.9	4.8	4.5	9.91	18.617	79.3	30.5	33.3	38.8	44.4	49.9	55.5	61
3.5	0.204	88.9	5.2	4.9	10.7	17.157	78.5	33.3	36.3	42.4	48.4	54.5	60.5	66.6
3.5	0.224	88.9	5.7	5.4	11.68	15.625	77.5	36.8	40.1	46.8	53.5	60.1	66.8	73.5
3.5	0.25	88.9	6.4	6	12.93	14	76.2	41.3	45	52.5	60	67.5	75	82.5
3.5	0.276	88.9	7	6.6	14.16	12.681	74.9	45.2	49.4	57.6	65.8	74	82.3	90.5
3.5	0.281	88.9	7.1	6.8	14.39	12.456	74.6	46.1	50.3	58.7	67.1	75.5	83.8	92.2
3.5	0.3	88.9	7.6	7.2	15.27	11.667	73.7	49.4	53.9	62.9	71.9	80.8	89.8	98.8

Which is better: carbon steel or titanium alloy coiled tubing?

Titanium alloy coiled tubing offers great strength, low density, strong corrosion resistance, a long fatigue life, and excellent heat resistance.

However, the buying cost of carbon steel coiled tubing is lower.

Applications of Coiled Tubing

The main aspect of continuous tubing applications is that they require frequent bending and distortion, which is classified as plastic deformation.

Continuous tubing is appropriate for well repair, logging, drilling, completion, and production increase operations in oil and gas well drilling and production.

Well repair: primarily used for sand washing, drilling, and grinding operations, gas lift induced spraying, salvage, drainage, high-condensate oil plugging, wax removal, ice plugging, and so on.
Drilling: small hole drilling, underbalanced drilling, deepening of ancient wells, side drilling horizontal wells, and so on.
Production increase: fixed-point fracturing, multilayer fracturing, homogeneous acid dispersion, and drag acidizing, among others.

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