API-5CT N80 Casing Pipe

API-5CT N80 oilfield casing pipe contains N80-1 and N80-Q types. Those two materials are absolutely consistent regarding the chemical composition and mechanical attributes, they are just various in the heat treatment.

During heat treatment, N80-1 steel is treated by normalizing and tempering, while N80Q steel is treated by quenching and tempering. Therefore, the collapsing strength and internal pressure strength of N80Q are higher than that of N80-1. N80-1 or N80Q should be clearly shown by the designer when N80 casing is selected.

As its mechanical properties are higher than J55 and K55 types, it may very well be utilized to certain a little more challenging formations. With deeper downhole depth than J55 and K55 types, it can be applied for the exploitation of middle-level oil and gas.

Due to the high capability of N80 material, those API-5CT casing pipes are broadly applied in natural gas as well as coal bed methane extraction, and geothermal wells.

 

Specifications

Inspection

Physical properties are checked and each length hydrostatically tested, normally to only 3,000 psi in the plain end (unthreaded) condition. The following are also checked:

  • Dimensions
  • Weights
  • Straightness
  • Lengths

Part of this inspection is to drift all lengths.
Despite all the American Petroleum Institute (API) specifications and testing, some tubing defects are still found after delivery; thus, some operators do further inspection.

Inspection Method

  • Size and surface inspection
  • NDT and pressure test and third party certication
  • Hydrostatic
  • Drifting test
  • Physical and chemicail analysis
  • Hardness and pressure test.
  • Electromagnetic
  • Magnetic particle
  • Ultrasonic

 

Dimensions And Weight

Size Weight Outside Diameter Wall Thickness End Finish
Grade
in mm in mm J55K55 L80 N80 C90T95 P110
4 1/2 9.50 4.500 114.3 0.205 5.21 PS – – – –
10.50 0.224 5.69 PSB – – – –
11.60 0.250 6.35 PSLB PLB PLB PLB PLB
13.50 0.290 7.37 – PLB PLB PLB PLB
15.10 0.337 9.56 – – – – PLB
5 11.50 5.00 127.00 0.220 5.59 PS – – – –
13.00 0.253 6.43 PSLB – – – –
15.00 0.296 7.52 PSLB PLB PLB PLBE PLB
18.00 0.362 9.19 – PLB PLB PLBE PLB
21.40 0.437 11.10 – PLB PLB PLB PLB
23.20 0.478 12.14 –     PLB  
24.10 0.500 12.70 –     PLB  
5 1/2 14.00 5.500 139.7 0.244 6.20 PS – – – –
15.50 0.275 6.98 PSLB – – – –
17.00 0.304 7.72 PSLB PLB PLB PLBE PLB
20.00 0.361 9.17 – PLB PLB PLBE PLB
23.00 0.415 10.54 – PLB PLB PLBE PLB
6 5/8 20.00 6.625 168.28 0.288 7.32 PSLB – – – –
24.00 0.352 8.94 PSLB PLB PLB PLBE PLB
28.00 0.417 10.59 – PLB PLB PLBE PLB
32.00 0.475 12.06 – PLB PLB PLBE PLB
7 17.00 7.00 177.80 0.231 5.87 – – – – –
20.00 0.272 6.91 PS – – – –
23.00 0.317 8.05 PSLB PLB PLB PLBE –
26.00 0.362 9.19 PSLB PLB PLB PLBE PLB
29.00 0.408 10.36 – PLB PLB PLBE PLB
32.00 0.453 11.51 – PLB PLB PLBE PLB
35.00 0.498 12.65 – PLB PLB PLBE PLB
38.00 0.540 13.72 – PLB PLB PLBE PLB
7 5/8 24.00 7.625 193.68 0.300 7.62 – – – – –
26.40 0.328 8.33 PSLB PLB PLB PLBE PLB
29.70 0.375 9.52 – PLB PLB PLBE PLB
33.70 0.430 10.92 – PLB PLB PLBE PLB
39.00 0.500 12.70 – PLB PLB PLBE PLB
42.80 0.562 14.27 – PLB PLB PLB PLB
45.30 0.595 15.11 – PLB PLB PLB PLB
47.10 0.625 15.88 – PLB PLB PLB PLB
8 5/8 24.00 8.625 219.08 0.264 6.71 PS – – – –
28.00 0.304 7.72 – – – – –
32.00 0.352 8.94 PSLB – – – –
36.00 0.400 10.16 PSLB PLB PLB PLBE PLB
40.00 0.450 11.43 – PLB PLB PLBE PLB
44.00 0.500 12.70 – PLB PLB PLBE PLB
49.00 0.557 14.15 – PLB PLB PLBE PLB
9 5/8 32.30 9.625 244.48 0.312 7.92 – – – – –
36.00 0.352 8.94 PSLB – – – –
40.00 0.395 10.03 PSLB PLB PLB PLBE –
43.50 0.435 11.05 – PLB PLB PLBE PLB
47.00 0.472 11.99 – PLB PLB PLBE PLB
53.50 0.545 13.84 – PLB PLB PLBE PLB
58.40 0.595 15.11 – PLB PLB PLB PLB
10 3/4 32.75 10.75 273.05 0.279 7.09 – – – – –
40.50 0.350 8.89 PSB – – – –
15.50 0.400 10.16 PSB – – – –
51.00 0.450 11.43 PSB PSB PSB PSBE PSB
55.50 0.495 12.57 – PSB PSB PSBE PSB
60.70 0.545 13.84 – – – PSBE PSB
65.70 0.595 15.11 – – – PSB PSB
13 3/8 48.00 13.375 339.73 0.330 8.38 – – – – –
54.50 0.380 9.65 PSB – – – –
61.00 0.430 10.92 PSB – – – –
68.00 0.480 12.19 PSB PSB PSB PSB PSB
72.00 0.514 13.06 – PSB PSB PSB PSB
16 65.00 16 406.40 0.375 9.53 – – – – –
75.00 0.438 11.13 PSB – – – –
84.00 0.495 12.57 PSB – – – –
109.00 0.656 16.66 P P P – P
18 5/8 87.50 18.625 473.08 0.435 11.05 PSB – – – –
20 94.00 20 508.00 0.438 11.13 PSLB – – – –
106.50 0.500 12.70 PSLB – – – –
133.00 0.635 16.13 PSLB – – – –

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