API 5CT J55 Casing and Tubing Specification

Date:2024-12-13Tags:casing and tubing, API 5CT, API 5CT P110, casing pipe

What is API 5CT J55 Casing and Tubing?

API 5CT J55 and K55 are lower grade pipes commonly used in the oil and gas industry. They have the same chemical composition and yield strength range of 379-552 MPa, but different tensile strengths, 517 MPa for J55 and 655 MPa for K55. Compared with high-grade steel pipes such as N80, L80, and P110, J55 and K55 are lower in cost and suitable for non-corrosive oil wells and applications with lower strength requirements. J55 is a typical representative of oil casing, with high yield strength (55,000 psi) and good fatigue resistance. It can withstand high pressure and temperature underground and is widely used in various oil and gas wells to protect wellbore, prevent collapse and provide conduits for well fluids. J55 is usually produced in the form of seamless steel pipes, and welded versions are also available, which is economical and versatile. During drilling operations, casing is cemented to enhance the stability of the wellbore wall after it is lowered, and the tubing is nested in the casing to transport oil and gas to the ground. Due to its affordable price and reliable performance, J55 is one of the most popular materials in oil well pipe applications today. J55 oil well casing is an important tool used in oil drilling. It has excellent elongation performance. After the pipeline enters the well, it can be cemented. Unlike tubing and drill pipe, casing is not reusable.

API 5CT J55 casing and tubing Main Uses

Used as casing pipe

J55 casing pipe is an important tool to support the wellbore wall of oil and gas wells. It can prevent wellbore collapse and maintain pressure balance in the well during drilling and after completion. After the casing is lowered into the well, it is fixed to the wellbore wall through the cementing process to ensure the long-term stability and safety of the wellbore.

Used as tubing pipe

J55 tubing has a small diameter and can be nested inside the casing. It is mainly responsible for transporting oil and gas from the well to the ground. Since the oil pipe needs to withstand pressure and fluid corrosion for a long time, J55's good elongation and pressure resistance make it an ideal material.


API 5CT J55 CASING AND TUBING SPECIFICATIONS


- Specification & Size of API 5CT J55 Tubing

DN O. D. Weight W. T. End Processing
Non-upset coupling-thread Upset coupling-thread 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 J55 Casing Pipe

DN O. D. Weight W. T.   End Machining Form
  Steel Grade
in mm lb/ft kg/m in mm H40 J55 L80 N80 C90 P110
K55 T95
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


Mechanical analysis of api 5ct j55

API 5CT Casing Pipe Standard API 5CT Casing Pipe Type
API 5CT Casing Pipe Tensile Strength
MPa
API 5CT Casing Pipe Yield Strength
MPa
API 5CT Casing Pipe Hardness
Max.
API SPEC 5CT J55 ≥517 379 ~ 552



CHEMICAL COMPOSITION OF API 5CT J55

Grade Type C Mn Mo Cr Ni max. Cu max. P max. S max. Si max.
min. max. min. max. min. max. min. max.
J55 – – – – – – – – – – – 0.03 0.03 –



API color code for J55/K55 tubing and casing

J55 Tubing: One bright green band, coupling bright green and no bands.
J55 Casing: One bright green band, coupling bright green and with one white band.
K55 Casing and Tubing:  two bright green, coupling bright green and no bands.



Reference Inspection for J55/K55 Casing and Tubing

Visual inspection for pipe surface
Dimension check
Mechanical test on tensile strength, yield strength and elongation
Chemical analysis
NDT test including Magnetic particle, Ultrasonic Test, Hydrostatic Test
Charpy impact test
Flattening tests
Hardness test
Drift test
Thread ends check with thread gauge and coupling check

API 5CT J55/K55 casing and tubing manufacturing types
J55/K55 pipes could be made in seamless or welded EW. In most cases the pipes made in seamless.

Heat treatment methods for J55/K55 Pipes

PSL1: J55 and K55 are the same (delivery condition hot rolled without heat treatment);
PSL2: J55, K55 casing and tubing should be the full length normalized or normalized and tempered, if thickened, should be thickened after normalizing or normalizing and tempering.

Charpy Impact Test

Casing and tubing pipe body:
PSL1: No difference between J55 and K55;
PSL2: J55 and K55 require a horizontal minimum impact energy of 20 J for a full-size specimen and 27 J for a full-size specimen.
Couplings: The J55 and K55 impact tests must be performed with a minimum transverse impact energy of 20 J for size specimens and 27 J for full-size specimens in the longitudinal direction.

None Destructive Test

J55/K55 PSL1: No mandatory requirements for NDE test.
J55/K55 PSL2: All grades pipes shall be inspected for the detection of longitudinal imperfections on the outside and inside surfaces to accepted by level L4 using one or more of the following methods:
a) Ultrasonic testing in accordance with ISO 9303 or ASTM E213;
B) Flux leakage testing in acoordance with ISO 9402 or ASTM E570;
c) Eddy current concentric coil testing in accordance with ISO 9304 or ASTM E309;
d) For pipe outside surface, magnetic particle inspection in accordance with ISO 13665 or ASTM E709.


Recruiting Agents, contact: info@baowi-steel.com

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