API 5CT Casing and Tubing Specification

Date:2024-10-23Tags:API 5CT, Casing and Tubing Specification, OCTG

API 5CT is standard technical specifications for steel casing and tubing pipes used for oil wells in petroleum and natural gas industries.Besides casing and tubing, it also includes pup joints, coupling stock, coupling material, and accessory materials, and establishes requirements for three product specification levels (PSL-1, PSL-2, and PSL-3). The requirements for PSL-1 are the basis of this standard.Besides casing and tubing, it also includes pup joints, coupling stock, coupling material, and accessory materials, and establishes requirements for three product specification levels (PSL-1, PSL-2, and PSL-3). The requirements for PSL-1 are the basis of this standard.


Casing and Tubing

API 5CT is applicable to following connections which complied with API SPEC 5B:

• SC: Short round thread casing pipe
• LC: Long ound thread casing pipe
• BC: Buttress thread casing
• NU: Non-upset tubing
• EU: External upset tubing
• IJ: Integral tubing connections


Common Grades

• J55/K55
• N80/N80Q/L80
• C90
• R95/T95
• P110/C110

• Q125



API 5CT Casing and Tubing dimensions/API 5CT Dimensional Table- Specification & Size of API 5CT 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 Casing/API Tubing and Casing Chart


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



WHAT IS API 5CT OCTG?

Oil country tubular goods (OCTG) is a family of steel pipe products used in the drilling, completion, and production of oil and gas wells. And, API 5CT is the standard for the group of products. OCTG casing and tubing are essential elements in the well construction process, as they provide support and protection for the well bore. Casing is installed first, followed by tubing. The casing is typically made of steel or other strong materials that can withstand the high pressure and temperature of the reservoir. Tubing is also made of steel, but it is thinner walled and carried inside the casing. OCTG products are manufactured to meet specific specifications that are based on the type of well being drilled. For example, sour service casing must be able to resist corrosion from hydrogen sulfide gas. Deepwater casing must be able to withstand the high pressures found at great depths. Ultimately, OCTG products play a vital role in ensuring the safety and efficiency of oil and gas drilling operations.



What is the difference between API 5CT casing and tubing?

API 5CT casing is a tube that is placed in a wellbore in order to protect the wellbore from contamination. Casing is also used to stabilize the wellbore and keep it secure. Drilling and casing operations occur alternately, with the drill string being removed at predetermined intervals. API 5CT tubing is used to carry petroleum from the depths of the well to the surface. Oil and gas may sometimes self-elevate to the surface; however, pumps are typically required in order to bring these fluids to the surface. Tubing typically has a smaller diameter than casing. The main purpose of tubing is to transport petroleum from the well to an external location.
Connections
API Spec.5CT includes an illustration of API tubing joint connections. All three connections have tapered and round thread forms with either 8 or 10 threads/in., depending on the size. When casing is used as tubing, long-thread coupling/short-thread coupling and buttress-thread coupling connections can be specified.




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

Copyright © Baowi Steel Manufacturing Co.,Ltd. All rights reserved.   Address:Gangcheng Road, Yuetang District, Xiangtan, China
facebookyoutubelinkinA_twitter

We use cookies to offer a better browsing experience, analyze site traffic, and personalize content. By using this site, you agree to our use of cookies.

Accept
Decline