Application Of ERW Casing&Tubing

ERW (Electric Resistance Welded) casing and tubing are types of steel pipes commonly used in the oil and gas industry for various applications, including drilling, production, and transportation of fluids.

ERW pipes are manufactured by forming steel coils into a cylindrical shape, are often more cost-effective than seamless pipes, making them a popular choice for certain applications.

Specifications Of Casing&Tubing Available For ERW

API 5CT PSL1/PSL2: H40, J55, K55, N80, L80, P110

OD: 2 7/8” to 10 3/4”

Connection: P(Plain end), STC (short threads), LTC (long threads), BTC (buttress threads), EUE(end upset), NUE(non-upset)

Length: R2, R3

ERW Casing and Tubing

ERW Casing and Tubing2

Choice Between ERW Or Seamless Casing&Tubing

The choice between ERW (Electric Resistance Welded) and seamless casing and tubing in oil and gas well construction depends on various factors, and each type has its advantages and considerations.

Cost:

ERW: Electric resistance welding is a cost-effective manufacturing process, making ERW pipes generally more economical than seamless pipes. If cost is a significant factor, ERW casing and tubing may be a preferred choice.

Seamless: Seamless pipes involve more complex manufacturing processes, which can lead to higher production costs. As a result, seamless casing and tubing are often more expensive than their ERW counterparts.

Strength And Performance:

ERW: While ERW pipes are strong and suitable for many applications, the welding process introduces a seam along the length of the pipe. This seam may have slightly lower mechanical properties compared to the rest of the pipe, and it can be a potential point of weakness. However, modern manufacturing and quality control processes have minimized these concerns.

Seamless: Seamless pipes are generally considered stronger because they lack the weld seam found in ERW pipes. The absence of a seam makes seamless pipes more uniform and less susceptible to potential weaknesses associated with welding.

Application And Environment:

ERW: ERW casing and tubing are well-suited for a wide range of applications, including conventional oil and gas wells. They are also commonly used in less demanding environments.

Seamless: Seamless pipes are often preferred in critical applications, high-pressure environments, and situations where the absence of a weld seam is crucial for safety and performance.

Chemical Composition

Table C.4—Chemical Composition,Mass Fraction (%)
Grade	Type	C		Mn		Mo		Cr		Ni	Cu	P	S	Si
Grade	Type	min	max	min	max	min	max	min	max	max	max	max	max	max
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
H40	-	-	-	-	-	-	-	-	-	-	-	-	0.030	-
J55	-	-	-	-	-	-	-	-	-	-	-	-	0.030	-
K55	-	-	-	-	-	-	-	-	-	-	-	-	0.030	-
N80	1	-	-	-	-	-	-	-	-	-	-	0.030	0.030	-
N80	Q	-	-	-	-	-	-	-	-	-	-	0.030	0.030	-
R95	-	-	0.45C	-	1.90	-	-	-	-	-	-	0.030	0.030	0.45
L80	1	-	0.43a	-	1.90	-	-	-	-	0.25	0.35	0.030	0.030	0.45
L80	9Cr	-	0.15	0.30	0.60	0.90	1.10	8.00	10.0	0.50	0.25	0.020	0.030	1.00
L80	13Cr	0.15	0.22	0.25	1.00	-	-	12.0	14.0	0.50	0.25	0.020	0.030	1.00
C90	1	-	0.35	-	1.20	0.25 b	0.85	-	1.50	0.99	-	0.020	0.030	-
T95	1	-	0.35	-	1.20	0.25 b	0.85	0.40	1.50	0.99	-	0.020	0.030	-
C110	-	-	0.35	-	1.20	0.25	1	0.40	1.50	0.99	-	0.020	0.030	-
P110	e	-	-	-	-	-	-	-	-	-	-	0.030 e	0.030 e	-
Q125	1	-	0.35	-	1.35	-	0.85	-	1.50	0.99	-	0.020	0.01	-
NOTE Elements shown shall be reported in product analysis
a. The carbon content for L80 may be increased up to 0.50 %maximum if the product is oil-quenched or polymer-quenched b. The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the wall thickness is less than 17.78 mm. c. The carbon content for R95 may be increased up to 0.55 %maximum if the product is oil-quenched d. The molybdenum content for T95 Type 1 may be decreased to 0.15 %minimum if the wall thickness is less than 17.78 mm e. For EW Grade P110,the phosphorus content shall be 0.020 %maximum and the sulfur content 0.010 %maximum.

Mechanical Properties

Table C.5—Tensile and Hardness Requirements
Grade	Type	Total Elongation Under Load	Yield Strength MPa		Tensile Strengt min MPa	Hardness a,c max		Specified Wal Thickness	Allowable Hardness Variation b
			min	max		HRC	HBW	mm	HRC
1	2	3	4	5	6	7	8	9	10
H40		0.5	276	552	414		—
J55	—	0.5	379	552	517	—	—
K55		0.5	379	552	655
N80 N80	1 Q	0.5 0.5	552 552	758 758	689 689	—	一 —	—	一
R95	——	0.5	655	758	724	—	—	—	—
L80 L80 L80	1 9Cr 13Cr	0.5 0.5 0.5	552 552 552	655 655 655	655 655 655	23.0 23.0 23.0	241 241 241	—— —	—
C90	1	0.5	621	724	689	25.4	255	≤12.70 12.71 to 19.04 19.05 to 25.39 ≥25.40	3.0 4.0 5.0 6.0
T95	1	0.5	655	758	724	25.4	255	≤12.7 12.71 to 19.04 19.05 to 25.39 ≥25.40	3.0 4.0 5.0 6.0
C110		0.7	758	828	793	30	286	≤12.70 12.71 to 19.04 19.05 to 25.39 ≥25.40	3.0 .0 5.0 6.0
P110		0.6	758	965	862
Q125	1	0.65	862	1034	931	b		≤12.70 12.71 to 19.04 19.05	3.0 4.0 5.0
a. In case of dispute,laboratory Rockwell C hardness testing shall be used as the referee method b. No hardness limits are specified,but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9 c. For through-wall hardness tests of Grades L80(all types),C90,T95 and C110,the requirements stated in HRC scale are for maximum mean hardness number.

Magnetic Detector

MPT is used to identify surface cracks or defects in ferromagnetic materials by applying a magnetic field and using magnetic particles.

Hydrostatic Test

A hydrostatic test is a common method used to assess the strength and integrity of seamless steel pipes. This test involves filling the pipe with water and pressurizing it to a specified level to check for any leaks or structural weaknesses.

Ultrasonic Detector

UT equipment is used to detect internal and external defects in casing and tubing pipes by sending ultrasonic waves through the material.

Eddy Current Test

ECT is used to identify surface and near-surface defects on casing and tubing in conductive materials by inducing eddy currents and detecting changes in their flow.

Metallographical Microscope

A specific requirements related to the analysis of steel microstructures.

Impact Tester

The Charpy impact test is a common method used to evaluate the impact toughness of steel pipes materials. The test involves striking a notched specimen with a swinging pendulum, and the energy absorbed by the material during fracture is measured.

Brinell Hardness Tester

Hardness testing measures the hardness of the material, which is important for assessing its resistance to deformation and wear.

Tensile Test Machine

This equipment is used to determine the tensile strength, yield strength, and elongation properties of casing and tubing pipes by subjecting them to axial tension.

Thread Projector

The primary function of a thread projector is to inspect and measure the geometry of threads on casings and tubings. This includes the pitch, flank angles, crests, roots, and other thread parameters.

ERW Casing And Tubing

Related Products

Quick Links

Support

Product Category

Contact Us

Availability:

Quantity:



Inquire Add to Basket