K55 Casing Tubing

Introduction

K55 casing tubing is a type of steel pipe used primarily in the oil and gas industry for the extraction of hydrocarbons. It serves as a conduit to transport oil and gas from the underground reservoirs to the surface. K55 is a grade within the API 5CT specification, known for its balance of strength and cost-effectiveness, making it suitable for medium-depth wells and moderate-pressure environments.

API Specifications

Scope

API 5CT specifies the requirements for casing and tubing used in oil and gas wells. K55 casing tubing is designed to meet these standards, ensuring it can withstand the operational pressures and environmental conditions encountered during drilling and production.

Chemical Composition

The chemical composition of K55 casing tubing ensures a balance of strength, toughness, and weldability. The typical chemical composition includes:

Element	Composition (%)
Carbon (C)	0.28 max
Manganese (Mn)	1.20 max
Phosphorus (P)	0.030 max
Sulfur (S)	0.030 max
Silicon (Si)	0.55 max

Mechanical Properties

The mechanical properties of K55 casing tubing are designed to ensure durability and reliability under various operational conditions. The typical mechanical properties include:

Tensile Strength: 655-758 MPa (95-110 ksi)
Yield Strength: Minimum 379 MPa (55 ksi)
Elongation: Minimum 19% in 2 inches

Pipe Sizes

K55 casing tubing is available in a range of sizes to accommodate different wellbore diameters and depths. Standard sizes are specified by their outside diameter (OD) and wall thickness. Common sizes include:

Outside Diameter (OD): 4 1/2 inches to 20 inches
Wall Thickness: Varies based on application requirements (e.g., 0.224 inches, 0.250 inches, etc.)

Technical Details, Dimensions, and Tolerances

Dimensions

The dimensions of K55 casing tubing are specified by their outside diameter (OD) and wall thickness. Standard sizes adhere to API 5CT requirements. Common dimensions include:

Outside Diameter (OD): 4 1/2 inches to 20 inches
Wall Thickness: Varies based on application requirements.

Tolerances

API 5CT outlines precise tolerances to ensure the pipes meet quality and performance standards. These tolerances include:

Outside Diameter (OD): ±1% of the specified OD
Wall Thickness: ±12.5% of the specified wall thickness
Weight: ±10% of the nominal weight per unit length

Wall Thickness & Tolerance

The wall thickness of K55 casing tubing is critical for its performance in drilling and production operations. Tolerances on wall thickness ensure consistent performance. The standard tolerances include:

Wall Thickness Tolerance: ±12.5% of the specified wall thickness.
Minimum Wall Thickness: The minimum wall thickness must not be less than 87.5% of the specified nominal wall thickness.

API CASING/ API 5CT K55 CASING TUBING SPECIFICATIONS

– Specification & Size of API 5CT K55 Tubing

DN	O. D.		Weight		W. T.		End Processing
	O. D.		Non-upset coupling-thread	Upset coupling-thread	W. T.		Steel Grade
	in	mm	lb./ft.	lb./ft.	in	mm	H40	J55	L80	N80	C90	T95	P110
2 3/8	2.38	60.3	4	–	0.167	4.24	PU	PN	PN	PN	PN	PN	–
			4.6	4.7	0.19	4.83	PNU	PNU	PNU	PNU	PNU	PNU	PNU
			5.8	5.95	0.254	6.45	–	–	PNU	PNU	PNU	PNU	PNU
			6.6	–	0.295	7.49	–	–	P	–	P	P	–
			7.35	7.45	0.336	8.53	–	–	PU	–	PU	PU	–
2 7/8	2.88	73	6.4	6.5	0.217	5.51	PNU	PNU	–	–	–	–	–
			7.8	7.9	0.276	7.01	–	–	–	–	–	–	–
			8.6	8.7	0.308	7.82	–	–	PLB	PLB	PLBE	–	PLB
			9.35	9.45	0.34	8.64	–	–	PLB	PLB	PLBE	–	PLB
			10.5	–	0.392	9.96	–	–	PLB	PLB	PLB	–	PLB
			11.5	–	0.44	11.18	–	–	–	–	PLB	–
3 1/2	3.5	88.9	7.7	–	0.216	5.49	PN	PN	PN	PN	PN	PN	–
			9.2	9.3	0.254	6.45	PNU	PNU	PNU	PNU	PNU	PNU	PNU
			10.2	–	0.289	7.34	PN	PN	PN	PN	PN	PN	–
			12.7	12.95	0.375	9.52	–	–	PNU	PNU	PNU	PNU	PNU
			14.3	–	0.43	10.92	–	–	P	–	P	P	–
			15.5	–	0.476	12.09	–	–	P	–	P	P	–
			17	–	0.53	13.46	–	–	P	–	P	P	–
4	4	102	9.5	–	0.226	5.74	PN	PN	PN	PN	PN	PN	–
			–	11	0.262	6.65	PU	PU	PU	PU	PU	PU	–
			13.2	–	0.33	8.38	–	–	P	–	P	P	–
			16.1	–	0.415	10.54	–	–	P	–	P	P	–
			18.9	–	0.5	12.7	–	–	P	–	P	P	–
			22.2	–	0.61	15.49	–	–	P	–	P	P	–
4 1/2	4.5	114	12.6	12.75	0.271	6.88	PNU	PNU	PNU	PNU	PNU	PNU	–
			15.2	–	0.337	8.56	–	–	P	–	P	P	–
			17	–	0.38	9.65	–	–	P	–	P	P	–
			18.9	–	0.43	10.92	–	–	P	–	P	P	PLB
			21.5	–	0.5	12.7	–	–	P	–	P	P	PLB
			23.7	–	0.56	14.22	–	–	P	–	P	P	PLB
			26.1	–	0.63	16	–	–	P	–	P	P	PLB
P——Plain；N—— Non-upset coupling-thread；U—— Upset coupling-thread； L——Integral

– Specification & Size of API 5CT K55 Casing

DN	O. D.		Weight		W. T.			End Machining Form
	O. D.		Weight		W. T.			Steel Grade
	in	mm	lb/ft	kg/m	in	mm	H40	J55	L80	N80	C90	P110
	in	mm	lb/ft	kg/m	in	mm	H40	K55	L80	N80	T95	P110
4 1/2	4.500	114.3	9.5	14.14	0.205	5.21	PS	PS	–	–	–	–
			10.5	15.63	0.224	5.69	–	PSB	–	–	–	–
			11.6	17.26	0.250	6.35	–	PSLB	PLB	PLB	PLB	PLB
			13.5	20.09	0.290	7.37	–	–	PLB	PLB	PLB	PLB
			15.1	22.47	0.337	9.56	–	–	–	–	–	PLB
5	5.000	127	11.5	17.11	0.220	5.59	–	PS	–	–	–	–
			13	19.35	0.253	6.43	–	PSLB	–	–	–	–
			15	22.32	0.296	7.52	–	PSLB	PLB	PLB	PLBE	PLB
			18	26.79	0.362	9.19	–	–	PLB	PLB	PLBE	PLB
			21.4	31.85	0.437	11.1	–	–	PLB	PLB	PLB	PLB
			23.2	34.53	0.478	12.14	–	–	–	–	PLB	–
			24.1	35.86	0.500	12.7	–	–	–	–	PLB	–
5 1/2	5.500	139.7	14	20.83	0.244	6.2	PS	PS	–	–	–	–
			15.5	23.07	0.275	6.98	–	PSLB	–	–	–	–
			17	25.3	0.304	7.72	–	PSLB	PLB	PLB	PLBE	PLB
			20	29.76	0.361	9.17	–	–	PLB	PLB	PLBE	PLB
			23	34.23	0.415	10.54	–	–	PLB	PLB	PLBE	PLB
			26.8	39.88	0.500	12.7	–	–	–	–	–	–
			29.7	44.2	0.562	14.27	–	–	–	–	–	–
			32.6	48.51	0.625	15.88	–	–	–	–	–	–
			35.3	52.53	0.687	17.45	–	–	–	–	–	–
			38	56.55	0.750	19.05	–	–	–	–	–	–
			40.5	60.27	0.812	20.62	–	–	–	–	–	–
			43.1	64.14	0.875	22.22	–	–	–	–	–	–
6 5/8	6.625	168.28	20	29.76	0.288	7.32	PS	PSLB	–	–	–	–
			24	35.72	0.352	8.94	–	PSLB	PLB	PLB	PLBE	PLB
			28	41.67	0.417	10.59	–	–	PLB	PLB	PLBE	PLB
			32	47.62	0.475	12.06	–	–	PLB	PLB	PLBE	PLB
7	7.000	177.8	17	25.3	0.231	5.87	PS	–	–	–	–	–
			20	29.76	0.272	6.91	PS	PS	–	–	–	–
			23	34.23	0.317	8.05	–	PSLB	PLB	PLB	PLBE	–
			26	38.69	0.362	9.19	–	PSLB	PLB	PLB	PLBE	PLB
			29	43.16	0.408	10.36	–	–	PLB	PLB	PLBE	PLB
			32	47.62	0.453	11.51	–	–	PLB	PLB	PLBE	PLB
			35	52.09	0.498	12.65	–	–	PLB	PLB	PLBE	PLB
			38	56.55	0.540	13.72	–	–	PLB	PLB	PLBE	PLB
			42.7	63.54	0.625	15.88	–	–	–	–	–	–
			46.4	69.05	0.687	17.45	–	–	–	–	–	–
			50.1	74.56	0.750	19.05	–	–	–	–	–	–
			53.6	79.77	0.812	20.62	–	–	–	–	–	–
			57.1	84.97	0.875	22.22	–	–	–	–	–	–
7 5/8	7.625	193.68	24	35.72	0.300	7.62	PS	–	–	–	–	–
			26.4	39.29	0.328	8.33	–	PSLB	PLB	PLB	PLBE	PLB
			29.7	44.2	0.375	9.52	–	–	PLB	PLB	PLBE	PLB
			33.7	50.15	0.430	10.92	–	–	PLB	PLB	PLBE	PLB
			39	58.05	0.500	12.7	–	–	PLB	PLB	PLBE	PLB
			42.8	63.69	0.562	14.27	–	–	PLB	PLB	PLB	PLB
			45.3	67.41	0.595	15.11	–	–	PLB	PLB	PLB	PLB
			47.1	70.09	0.625	15.88	–	–	PLB	PLB	PLB	PLB
			51.2	76.19	0.687	17.45	–	–	–	–	–	–
			55.3	80.3	0.750	19.05	–	–	–	–	–	–
8 5/8	8.625	219.08	24	35.72	0.264	6.71	–	PS	–	–	–	–
			28	41.62	0.304	7.72	PS	–	–	–	–	–
			32	47.62	0.352	8.94	PS	PSLB	–	–	–	–
			36	53.57	0.400	10.16	–	PSLB	PLB	PLB	PLBE	PLB
			40	59.53	0.450	11.43	–	–	PLB	PLB	PLBE	PLB
			44	65.48	0.500	12.7	–	–	PLB	PLB	PLBE	PLB
			49	72.92	0.557	14.15	–	–	PLB	PLB	PLBE	PLB
9 5/8	9.625	244.48	32.3	48.07	0.312	7.92	PS	–	–	–	–	–
			36	53.57	0.352	8.94	PS	PSLB	–	–	–	–
			40	59.53	0.395	10.03	–	PSLB	PLB	PLB	PLBE	–
			43.5	64.73	0.435	11.05	–	–	PLB	PLB	PLBE	PLB
			47	69.94	0.472	11.99	–	–	PLB	PLB	PLBE	PLB
			53.5	79.62	0.545	13.84	–	–	PLB	PLB	PLBE	PLB
			58.4	86.91	0.595	15.11	–	–	PLB	PLB	PLB	PLB
			59.4	88.4	0.609	15.47	–	–	–	–	–	–
			64.9	96.58	0.672	17.07	–	–	–	–	–	–
			70.3	104.62	0.734	18.64	–	–	–	–	–	–
			75.6	112.5	0.797	20.24	–	–	–	–	–	–
10 3/4	10.750	273.05	32.75	48.74	0.279	7.09	PS	–	–	–	–	–
			40.5	60.27	0.350	8.89	PS	PSB	–	–	–	–
			15.5	67.71	0.400	10.16	–	PSB	–	–	–	–
			51	75.9	0.450	11.43	–	PSB	PSB	PSB	PSBE	PSB
			55.5	82.59	0.495	12.57	–	–	PSB	PSB	PSBE	PSB
			60.7	90.33	0.545	13.84	–	–	–	–	PSBE	PSB
			65.7	97.77	0.595	15.11	–	–	–	–	PSB	PSB
			73.2	108.93	0.672	17.07	–	–	–	–	–	–
			79.2	117.86	0.734	18.64	–	–	–	–	–	–
			85.3	126.94	0.797	20.24	–	–	–	–	–	–
11 3/4	11.750		42	62.5	0.333	8.46	PS	–	–	–	–	–
			47	69.94	0.375	20.24	–	–	–	–	–	–
			54	80.36	0.435	8.46	–	–	–	–	–	–
			60	89.29	0.489	9.53	–	–	–	–	–	–
			65	96.73	0.534	11.05	–	–	–	–	–	–
			71	105.66	0.582	14.42	–	–	–	–	–	–
13 3/8	13.375	339.73	48	71.43	0.330	8.38	PS	–	–	–	–	–
			54.5	81.1	0.380	9.65	–	PSB	–	–	–	–
			61	90.78	0.430	10.92	–	PSB	–	–	–	–
			68	101.19	0.480	12.19	–	PSB	PSB	PSB	PSB	PSB
			72	107.15	0.514	13.06	–	–	PSB	PSB	PSB	PSB
16	16.000	406.4	65	96.73	0.375	9.53	PS	–	–	–	–	–
			75	111.61	0.438	11.13	–	PSB	–	–	–	–
			84	125.01	0.495	12.57	–	PSB	–	–	–	–
			109	162.21	0.656	16.66	–	P	P	P	–	P
18 5/8	18.625	473.08	87.5	130.21	0.435	11.05	PS	PSB	–	–	–	–
20	20.000	508	94	139.89	0.438	11.13	PSL	PSLB	–	–	–	–
			106.5	158.49	0.500	12.7	–	PSLB	–	–	–	–
			133	197.93	0.635	16.13	–	PSLB	–	–	–	–
P——Plain；S——Short-thread；L——Long-thread；B——Buttress thread；E——Extreme thread

API 5CT K55 TOLERANCE

Item		Allowable Tolerance
Outer diameter	Pipe body	D≤101.60mm±0.79mm
		D≥114.30mm+1.0%
		-0.50%

Materials and Manufacture

Materials

K55 casing tubing is made from carbon steel, providing a balance of strength, toughness, and cost-effectiveness. The material is suitable for applications where moderate strength and resistance to collapse and internal pressure are required.

Manufacture

The manufacturing process for K55 casing tubing involves several steps to ensure quality and performance:

Steelmaking: High-quality carbon steel is produced through processes such as electric arc furnace (EAF) or basic oxygen furnace (BOF).
Forming: The steel is formed into cylindrical shapes using processes such as seamless rolling or welding.
Heat Treatment: The pipes may undergo heat treatment processes such as normalizing or quenching and tempering to enhance their mechanical properties.
Finishing: The pipes are finished to achieve the desired surface quality, dimensions, and tolerances.

Tests

To ensure the quality and performance of K55 casing tubing, several tests are conducted as per API 5CT requirements:

Hydrostatic Test

A hydrostatic test is performed to verify the pipes’ ability to withstand internal pressure. The pipes are filled with water and pressurized to a specified level to check for leaks and structural integrity.

Nondestructive Testing (NDT)

Nondestructive testing methods are used to detect internal and surface defects without damaging the pipes. Common NDT methods include:

Ultrasonic Testing: High-frequency sound waves are used to detect internal flaws.
Magnetic Particle Inspection: Detects surface and near-surface defects using magnetic fields.

Mechanical Tests

Mechanical tests are conducted to verify the pipes’ mechanical properties, including:

Tensile Test: Measures tensile strength, yield strength, and elongation.
Hardness Test: Verifies hardness levels to ensure compliance with specified limits.
Flattening Test: Checks the pipe’s ability to withstand deformation without cracking.

Heat Treatment

Heat treatment processes such as normalizing or quenching and tempering may be applied to K55 casing tubing to enhance their mechanical properties and ensure consistent performance:

Normalizing

Normalizing involves heating the pipes to a temperature above the critical temperature and then cooling them in air. This process refines the grain structure, improving toughness and strength.

Quenching and Tempering

Quenching and tempering involves heating the pipes to a high temperature, quenching them in water or oil to rapidly cool, and then reheating to a lower temperature to relieve stresses and improve toughness.

Conclusion

K55 casing tubing is a crucial component in the drilling and production of oil and gas wells. It is manufactured to meet API 5CT standards, ensuring quality, performance, and reliability. Through rigorous manufacturing processes, precise dimensions and tolerances, and comprehensive testing, K55 casing tubing delivers dependable performance in various drilling and production environments.

API 5CT Casing Pipe For Oilfield

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API 5CT H40 octg casing pipe

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API 5CT J55 CASING & TUBING

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K55 Casing Tubing