API 5ct J55 and K55 casing and Tubing are lower grade material Pipes among all API 5CT pipes. They have the same chemical composition and the same yield strength 379-552 Mpa, but under different tensile conditions, J55 stretches The minimum strength is 517 Mpa, K55 is 655 Mpa. J55/K55 has a lower grade than N80, L80, P110 or T95, making it a cheaper material of choice and widely used in corrosion-free, low-strength Oil well installations.

J55/K55 identification API color code
J55 Tube: One bright green ribbon, coupling bright green and no ribbon.
J55 Housing: One bright green band, coupling bright green and one white band.
K55 casing and tubing: two bright green, coupling bright green and no straps.

API 5CT specification
API 5CT defines the delivery conditions for steel casing and tubing for oil well installation, covering pup joints, coupling blanks, coupling materials and accessory materials, and establishes three product specification levels (PSL-1, PSL-2 and PSL -2) requirements. PSL-3). The requirements of PSL-1 are the basis of this standard.

4 groups of grades
API 5CT has 4 groups, J55/K55 is in the 1st group.

  • Group 1: All casing and tubing of grades H, J, K, N and R
  • Group 2: All casing and tubing of grades C, L, M and T
  • Group 3: All casing and tubing grade P
  • Group 4: All casing grade Q

connect
API 5CT is suitable for the following connections that comply with API SPEC 5B:

J55/K55 reference inspection
Visual inspection of pipe surfaces
Dimensional inspection
Mechanical testing of tensile strength, yield strength and elongation
Chemical analysis
Non-destructive testing includes magnetic particle, ultrasonic and Hydrostatic testing
Simply supported beam impact test
Flatten test
Hardness Testing
Drift test
Inspect thread ends using thread gauges and coupling inspection

J55 VS K55 (PSL1 and PSL2)
J55 and K55 are similar materials in terms of chemical composition and mechanical properties. In particular, J55 has lower minimum tensile requirements and lower elongation. Other specifications are the same, such as heat treatment method, NDE test, Charpy impact test, and hydrostatic test. .

J55/K55 minimum yield strength: 379-552 Mpa;
J55 minimum tensile strength: 517Mpa, elongation ≥19%;
K55 minimum tensile strength: 655Mpa, elongation ≥15%.

API 5CT J55/K55 Casing and Tubing manufacturing Types
J55/K55 pipes can be made from seamless or welded EW. In most cases, pipes are made seamless.

Heat treatment method for J55/K55 pipes
PSL1: J55 is the same as K55 (delivery state is hot rolled, without heat treatment);
PSL2: J55, K55 casing and oil pipe should be normalized or normalized and tempered for the entire Length. If thickened, they should be thickened after normalizing or normalizing and tempering.

Simply supported beam impact test
Casing and tubing body:
PSL1: There is no difference between J55 and K55;
PSL2: J55 and K55 require a minimum horizontal impact energy of 20 J for full-size samples and a minimum horizontal impact energy of 27 J for full-size samples.
Couplings: J55 and K55 Impact tests must be carried out with a minimum transverse impact energy of 20 J for size specimens and 27 J for full-size specimens in the longitudinal direction.

non-destructive testing
J55/K55 PSL1: NDE test is not mandatory.
J55/K55 PSL2: Pipes of all grades shall be inspected for longitudinal defects on the outer and inner surfaces using one or more of the following methods to meet L4 requirements:

a) Ultrasonic testing according to ISO 9303 or astm E213;
B) Conduct magnetic flux leakage test according to ISO 9402 or ASTM E570;
c) Eddy current concentric coil testing according to ISO 9304 or ASTM E309;
d) For the outer surface of the pipe, conduct magnetic particle inspection according to ISO 13665 or ASTM E709.

API 5CT J55/K55 casing and tubing applications:
As we all know, steel casing is considered as the pipe pile to stabilize the oil well. Casing is installed downhole in an oil well to provide structural integrity to the wellbore and withstand external collapse pressure from the rock formation and internal yield pressure from fluids and gases. It needs to bear the pressure of its own Weight and withstand the torque and axial pressure exerted on it when operating downhole.

Pipe applications:
oil pipes placed within casing are used to transport crude oil or natural gas from source rocks to surface Wellheads. Inside the oil pipe is the sucker rod, which is used to pump oil and natural gas.

chemical composition

Mechanical behavior

Dimensions and tolerances
Length range:
R1: 4.88 to 7.62 meters, the maximum allowable deviation is 1.83 meters, the minimum allowable length is 5.49 meters.
R2: 7.62 to 10.36 meters.
R3: 10.36 to 14.63 meters.

Outer Diameter tolerance:
For pipe up to 4-1/2 inches, tolerance is +/- 0.79 mm or 0.031 inches
For pipe equal to or larger than 4-1/2 inches, the tolerance is +1% and -0.5% of the pipe diameter

Wall thickness tolerance – 12.5%.
defect:
For J55/K55 pipes, the maximum allowable depth of linear, external and internal imperfections is 12.5 times the wall thickness. (Other grades H40, M65, N80 Type 1, N80Q, L80, R95, P110 use the same terminology)

P110 Octal supply range for casing and tubing
Standard: api spec 5ct
Brand: J55, K55, N80, L80, P110, T95
PSL level: PSL1, PSL2, PSL3
In stock: Yes
Manufacturing process: seamless, erw
P110 casing and tubing outer diameter: 2-3/8”, 2-7/8”, 3-1/2”, 4-1/2”, 5-1/2”, 6-5/8”, 7”, 7-5/8”, 7-3/4”, 8-5/8”, 9-5/8”, 10-3/4”, 11-3/4”, 13-3/8 ” , 16”, 18-5/8”, 20”
Thickness: 4 lb/ft to 106.59 lb/ft, 0.244” to 0.875”
Connection thread: BTC, trapezoidal (regular, special bevel or special gap), ltc, STC, advanced connection thread.
Length: R1, R2, R3, customized

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