API SPEC 5CT
What is API SPEC 5CT?
API SPEC 5CT is the standard of oil casing and tubing issued by the American Petroleum Institute. Steel pipe is for usage as casing and tubing for oil wells. API SPEC 5CT specifies the technical delivery conditions for casing pipe, tubing, pup joint, coupling stock and coupling materials and accessory material and requirements for three levels PSL-1, PSL-2, PSL-3.
Name: API SPEC 5CT casing and tubing
Steel Grades: J55, K55, N80, L80, P110
Standard: API SPEC 5CT
Specifications:
Outer dimensions: 6.0mm – 219.0mm;
Wall Thickness: 1.0mm – 30 mm;
Length: max 12000mm;
Applications: Gas and oil drilling and transportation
Mechanical Properties:
| Standard | Steel grades | Tensite strength(MPa) | Yield strength(MPa) | Elongation(%) | Hardness |
|---|---|---|---|---|---|
| API SPEC 5CT | J55 | ≥517 | 379～552 | ||
| K55 | ≥517 | ≥655 | |||
| N80 | ≥689 | 552～758 | |||
| L80(13Cr) | ≥655 | 552～655 | ≤241HB | ||
| P110 | ≥862 | 758～965 |
Chemical Compositions:
| Standard | Steel Grade | Chemical Compositions(%) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | Cr | Ni | Cu | Mo | V | Als | ||
| APL SPEC 5CT | J55/K55 | 0.34～0.39 | 0.20～0.35 | 1.25～1.50 | ≤0.020 | ≤0.015 | ≤0.15 | ≤0.20 | ≤0.20 | / | / | ≤0.020 |
| N80 | 0.34～0.38 | 0.20～0.35 | 1.45～1.70 | ≤0.020 | ≤0.015 | ≤0.15 | / | 0.11～0.16 | ≤0.020 | |||
| L80(13Cr) | 0.15～0.22 | ≤1.00 | 0.25～1.00 | ≤0.020 | ≤0.010 | 12.0～14.0 | ≤0.20 | ≤0.20 | / | / | ≤0.020 | |
| P110 | 0.26～0.35 | 0.17～0.37 | 0.40～0.70 | ≤0.020 | ≤0.010 | 0.80～1.10 | ≤0.20 | ≤0.20 | 0.15～0.25 | ≤0.08 | ≤0.020 | |
Oil Tubing Specifications:
| Size | Weight Lb/ft | Outside Diameter | Wall Thickness | Nominal Weight | Type End Finish | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Steel Grade | ||||||||||||
| Nonupset | Ex-upset | mm | mm | Nonupset | Ex-upset | J55/K55 | L80 | N80 | C90 | T95 | P110 | |
| T & C | T & C | T & C | T & C | |||||||||
| 23/8” | 4 | -- | 60.32 | 4.24 | 5.95 | -- | PN | PN | PN | PN | PN | -- |
| 4.6 | 4.7 | 60.32 | 4.83 | 6.85 | 6.99 | PNU | PNU | PNU | PNU | PNU | PNU | |
| 5.8 | 5.95 | 60.32 | 6.45 | 8.63 | 8.85 | -- | PNU | PNU | PNU | PNU | PNU | |
| 6.6 | -- | 60.32 | 7.49 | 9.82 | -- | -- | P | -- | P | P | -- | |
| 7.35 | 7.45 | 60.32 | 8.53 | 10.94 | 11.09 | -- | PU | -- | PU | PU | -- | |
| 27/8” | 6.4 | 6.5 | 73.02 | 5.51 | 9.52 | 9.67 | PUN | PNU | PNU | PNU | PNU | PNU |
| 7.8 | 7.9 | 73.02 | 7.01 | 11.61 | 11.76 | -- | PNU | PNU | PNU | PNU | PNU | |
| 8.6 | 8.7 | 73.02 | 7.82 | 12.8 | 12.95 | -- | PNU | PNU | PNU | PNU | PNU | |
| 9.35 | 9.45 | 73.02 | 8.64 | 13.91 | 14.06 | -- | PU | -- | PU | PU | -- | |
| 10.5 | -- | 73.02 | 9.96 | 15.63 | -- | -- | P | -- | P | P | -- | |
| 11.5 | -- | 73.02 | 11.18 | 17.11 | -- | -- | P | -- | P | P | -- | |
| 31/2” | 7.7 | -- | 88.9 | 5.49 | 11.46 | -- | PN | PN | PN | PN | PN | -- |
| 9.2 | 9.3 | 88.9 | 6.45 | 13.69 | 13.84 | PNU | PNU | PNU | PNU | PNU | PNU | |
| 10.2 | -- | 88.9 | 7.34 | 15.18 | -- | PN | PN | PN | PN | PN | -- | |
| 12.7 | 12.95 | 88.9 | 9.52 | 18.9 | 19.27 | -- | PNU | PNU | PNU | PNU | PNU | |
| 14.3 | -- | 88.9 | 10.92 | 21.28 | -- | -- | P | -- | P | P | -- | |
| 15.5 | -- | 88.9 | 12.09 | 23.07 | -- | -- | P | -- | P | P | -- | |
| 17 | -- | 88.9 | 13.46 | 25.3 | -- | -- | P | -- | P | P | -- | |
| 4” | 9.5 | -- | 101.6 | 5.74 | 14.14 | -- | PN | PN | PN | PN | PN | PN |
| 10.7 | 11 | 101.6 | 6.65 | -- | 16.37 | PU | PU | PU | PU | PU | PU | |
| 13.2 | -- | 101.6 | 8.38 | 19.64 | -- | -- | P | -- | P | P | -- | |
| 16.1 | -- | 101.6 | 10.54 | 23.96 | -- | -- | P | -- | P | P | -- | |
| 18.9 | -- | 101.6 | 12.7 | 28.13 | -- | -- | P | -- | P | P | -- | |
| 22.2 | -- | 101.6 | 15.49 | 33.04 | -- | -- | P | -- | P | P | -- | |
| 41/2” | 12.6 | 12.75 | 114.3 | 6.88 | 18.75 | 18.97 | PUN | PNU | PNU | PNU | PNU | PNU |
| 15.2 | -- | 114.3 | 8.56 | 22.62 | -- | -- | P | -- | P | P | -- | |
| 17 | -- | 114.3 | 9.65 | 25.3 | -- | -- | P | -- | P | P | -- | |
| 18.9 | -- | 114.3 | 10.92 | 28.13 | -- | -- | P | -- | P | P | -- | |
| 21.5 | -- | 114.3 | 12.7 | 32 | -- | -- | P | -- | P | P | -- | |
| 23.7 | -- | 114.3 | 14.22 | 35.27 | -- | -- | P | -- | P | P | -- | |
| 26.1 | -- | 114.3 | 16 | 38.84 | -- | -- | P | -- | P | P | -- | |
| Note: P-plain end; N-nonupset thread and coupling; U-upset thread and coupling. | ||||||||||||
Casing Pipe Specifications:
| Size | Weight Lb/ft | Outside Diameter | Wall Thickness | Type End Finish | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Steel Grade | |||||||||||||
| ln. | mm | ln. | mm | H-40 | J55/ K55 | M65 | L-80C-95 | N80 | C-90T-95 | P110 | Q125 | ||
| 7 5/8” | 24.00 | 7.625 | 193.68 | 0.300 | 7.62 | PS | -- | -- | -- | -- | -- | -- | -- |
| 26.40 | 7.625 | 193.68 | 0.328 | 8.33 | -- | PSLB | PSLB | PLB | PLB | PLB | PLB | -- | |
| 29.70 | 7.625 | 193.68 | 0.375 | 9.53 | -- | -- | PLB | PLB | PLB | PLB | PLB | -- | |
| 33.70 | 7.625 | 193.68 | 0.430 | 10.92 | -- | -- | PLB | PLB | PLB | PLB | PLB | -- | |
| 39.00 | 7.625 | 193.68 | 0.500 | 12.70 | -- | -- | -- | PLB | PLB | PLB | PLB | PLB | |
| 42.80 | 7.625 | 193.68 | 0.562 | 14.27 | -- | -- | -- | PLB | PLB | PLB | PLB | PLB | |
| 45.30 | 7.625 | 193.68 | 0.595 | 15.11 | -- | -- | -- | PLB | PLB | PLB | PLB | PLB | |
| 47.10 | 7.625 | 193.68 | 0.625 | 15.88 | -- | -- | -- | PLB | PLB | PLB | PLB | PLB | |
| 51.20 | 7.625 | 193.68 | 0.687 | 17.45 | -- | -- | -- | -- | -- | P | -- | -- | |
| 55.30 | 7.75 | 193.68 | 196.85 | 19.05 | -- | -- | -- | -- | -- | P | -- | -- | |
| 7 3/4” | 46.10 | 8.625 | 219.08 | 0.595 | 15.11 | -- | -- | -- | P | P | P | P | P |
| 8 5/8” | 24.00 | 8.625 | 219.08 | 0.264 | 6.71 | -- | PS | PS | -- | -- | -- | -- | -- |
| 28.00 | 8.625 | 219.08 | 0.304 | 7.72 | PS | -- | PS | -- | -- | -- | -- | -- | |
| 32.00 | 8.625 | 219.08 | 0.352 | 8.94 | PS | PSLB | PSLB | -- | -- | -- | -- | -- | |
| 36.00 | 8.625 | 219.08 | 0.400 | 10.16 | -- | PSLB | PSLB | PLB | PLB | PLB | PSLB | -- | |
| 40.00 | 8.625 | 219.08 | 0.450 | 11.43 | -- | -- | PLB | PLB | PLB | PLB | PLB | -- | |
| 44.00 | 8.625 | 219.08 | 0.500 | 12.70 | -- | -- | PLB | PLB | PLB | PLB | PLB | -- | |
| 49.00 | 9.625 | 244.48 | 0.557 | 14.15 | -- | -- | -- | PLB | PLB | PLB | PLB | PLB | |
| 9 5/8” | 32.30 | 9.625 | 244.48 | 0.312 | 7.92 | PS | -- | -- | -- | -- | -- | -- | -- |
| 36.00 | 9.625 | 244.48 | 0.352 | 8.94 | PS | PSLB | PSLB | -- | -- | -- | -- | -- | |
| 40.00 | 9.625 | 244.48 | 0.395 | 10.03 | -- | PSLB | PSLB | PLB | PLB | PLB | -- | -- | |
| 43.50 | 9.625 | 244.48 | 0.435 | 11.05 | -- | -- | PLB | PLB | PLB | PLB | PLB | -- | |
| 47.00 | 9.625 | 244.48 | 0.472 | 11.99 | -- | -- | PLB | PLB | PLB | PLB | PLB | PLB | |
| 53.50 | 9.625 | 244.48 | 0.545 | 13.84 | -- | -- | -- | PLB | PLB | PLB | PLB | PLB | |
| 58.40 | 9.625 | 244.48 | 0.595 | 15.11 | -- | -- | -- | PLB | PLB | PLB | PLB | PLB | |
| 59.40 | 9.625 | 244.48 | 0.609 | 15.47 | -- | -- | -- | -- | -- | P | -- | -- | |
| 64.90 | 9.625 | 244.48 | 0.672 | 17.07 | -- | -- | -- | -- | -- | P | -- | -- | |
| 70.30 | 9.625 | 244.48 | 0.734 | 18.64 | -- | -- | -- | -- | -- | P | -- | -- | |
| 75.60 | 9.625 | 244.48 | 0.797 | 20.24 | -- | -- | -- | -- | -- | P | -- | -- | |
| P-plain end; S-short round thread; L-long round thread; B-buttress thread. | |||||||||||||
Casing Pipe Specifications:
| Size |
Weight (Lb/ft) |
Outside Diameter | Wall Thickness | Type End Finish | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Steel Grade | |||||||||||||
| ln. | mm | ln. | mm | H-40 |
J-55 K-55 |
M-65 |
L-80 C-95 |
N-80 | C-90T-95 | P-110 | Q-125 | ||
| 10 3/4” | 32.75 | 10.75 | 273.05 | 0.279 | 7.09 | PS | -- | -- | -- | -- | -- | -- | -- |
| 40.50 | 10.75 | 273.05 | 0.350 | 8.89 | PS | PSB | PSB | -- | -- | -- | -- | -- | |
| 45.50 | 10.75 | 273.05 | 0.400 | 10.16 | -- | PSB | PSB | -- | -- | -- | -- | -- | |
| 51.00 | 10.75 | 273.05 | 0.450 | 11.43 | -- | PSB | PSB | PSB | PSB | PSB | PSB | -- | |
| 55.50 | 10.75 | 273.05 | 0.495 | 12.57 | -- | -- | PSB | PSB | PSB | PSB | PSB | -- | |
| 60.70 | 10.75 | 273.05 | 0.545 | 13.84 | -- | -- | -- | -- | -- | PSB | PSB | PSB | |
| 65.70 | 10.75 | 273.05 | 0.595 | 15.11 | -- | -- | -- | -- | -- | PSB | PSB | PSB | |
| 73.20 | 10.75 | 273.05 | 0.672 | 17.07 | -- | -- | -- | -- | -- | P | -- | -- | |
| 79.20 | 10.75 | 273.05 | 0.734 | 18.64 | -- | -- | -- | -- | -- | P | -- | -- | |
| 85.30 | 10.75 | 273.05 | 0.797 | 20.24 | -- | -- | -- | -- | -- | P | -- | -- | |
| 11 3/4” | 42.00 | 11.75 | 298.45 | 0.333 | 8.46 | PS | -- | -- | -- | -- | -- | -- | -- |
| 47.00 | 11.75 | 298.45 | 0.375 | 9.53 | -- | PSB | PSB | -- | -- | -- | -- | -- | |
| 54.00 | 11.75 | 298.45 | 0.435 | 11.05 | -- | PSB | PSB | -- | -- | -- | -- | -- | |
| 60.00 | 11.75 | 298.45 | 0.489 | 12.42 | -- | PSB | PSB | PSB | PSB | PSB | PSB | PSB | |
| 65.00 | 11.75 | 298.45 | 0.534 | 13.56 | -- | -- | -- | P | P | P | P | P | |
| 71.00 | 11.75 | 298.45 | 0.582 | 14.78 | -- | -- | -- | P | P | P | P | P | |
| 13 3/8” | 48.00 | 13.375 | 339.73 | 0.330 | 8.38 | PS | -- | -- | -- | -- | -- | -- | -- |
| 54.50 | 13.375 | 339.73 | 0.380 | 9.65 | -- | PSB | PSB | -- | -- | -- | -- | -- | |
| 61.00 | 13.375 | 339.73 | 0.430 | 10.92 | -- | PSB | PSB | -- | -- | -- | -- | -- | |
| 68.00 | 13.375 | 339.73 | 0.480 | 12.19 | -- | PSB | PSB | PSB | PSB | PSB | PSB | -- | |
| 72.00 | 13.375 | 339.73 | 0.514 | 13.06 | -- | -- | -- | PSB | PSB | PSB | PSB | PSB | |
| P-plain end; S-short round thread; L-long round thread; B-buttress thread. | |||||||||||||
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