Description
What is API 5CT Casing?
API 5CT Casing is a vital component in the oil and gas industry, primarily used for well drilling operations. Manufactured according to the American Petroleum Institute (API) 5CT standard, this casing pipe provides structural integrity to the wellbore and prevents contamination of groundwater. API 5CT casing is designed to withstand extreme conditions, including high pressure, corrosive environments, and varying temperatures encountered in drilling applications.
Features of API 5CT Casing
- High Strength & Durability: Made from premium-grade carbon and alloy steel, API 5CT casing ensures exceptional mechanical strength and longevity.
- Corrosion & Wear Resistance: The casing undergoes advanced treatments such as heat treatment, galvanization, and anti-corrosion coatings, making it suitable for harsh environments.
- Precise Dimensions & Threading: Manufactured with strict adherence to API specifications, ensuring compatibility with various drilling equipment and couplings.
- Excellent Load-Bearing Capacity: Engineered to support heavy loads and resist external collapse pressures.
- Variety of Grades: Available in different grades such as J55, K55, N80, L80, P110, Q125, and more, catering to diverse operational needs.
API 5CT Casing Dimensions
| DN | O. D. | Weight | W. T. | End Machining Form | ||||||||
| Steel Grade | ||||||||||||
| Inch | mm | lb/ft | kg/m | Inch | mm | H40 | J55 | L80 | N80 | C90 | P110 | |
| K55 | T95 | |||||||||||
| 4 1/2 | 4.5 | 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 | 0.25 | 6.35 | – | PSLB | PLB | PLB | PLB | PLB | |||
| 13.5 | 20.09 | 0.29 | 7.37 | – | – | PLB | PLB | PLB | PLB | |||
| 15.1 | 22.47 | 0.337 | 9.56 | – | – | – | – | – | PLB | |||
| 5 | 5 | 127 | 11.5 | 17.11 | 0.22 | 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 | 0.5 | 12.7 | – | – | – | – | PLB | – | |||
| 5 1/2 | 5.5 | 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 | 0.5 | 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 | 0.75 | 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 | 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 | 0.54 | 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 | 0.75 | 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 | 0.3 | 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 | 0.43 | 10.92 | – | – | PLB | PLB | PLBE | PLB | |||
| 39 | 58.05 | 0.5 | 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 | 0.75 | 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 | 0.4 | 10.16 | – | PSLB | PLB | PLB | PLBE | PLB | |||
| 40 | 59.53 | 0.45 | 11.43 | – | – | PLB | PLB | PLBE | PLB | |||
| 44 | 65.48 | 0.5 | 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 | 10.75 | 273.05 | 32.75 | 48.74 | 0.279 | 7.09 | PS | – | – | – | – | – |
| 40.5 | 60.27 | 0.35 | 8.89 | PS | PSB | – | – | – | – | |||
| 15.5 | 67.71 | 0.4 | 10.16 | – | PSB | – | – | – | – | |||
| 51 | 75.9 | 0.45 | 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 | 11.75 | 298.45 | 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 | 0.33 | 8.38 | PS | – | – | – | – | – |
| 54.5 | 81.1 | 0.38 | 9.65 | – | PSB | – | – | – | – | |||
| 61 | 90.78 | 0.43 | 10.92 | – | PSB | – | – | – | – | |||
| 68 | 101.19 | 0.48 | 12.19 | – | PSB | PSB | PSB | PSB | PSB | |||
| 72 | 107.15 | 0.514 | 13.06 | – | – | PSB | PSB | PSB | PSB | |||
| 16 | 16 | 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 | 508 | 94 | 139.89 | 0.438 | 11.13 | PSL | PSLB | – | – | – | – |
| 106.5 | 158.49 | 0.5 | 12.7 | – | PSLB | – | – | – | – | |||
| 133 | 197.93 | 0.635 | 16.13 | – | PSLB | – | – | – | – | |||
API 5CT J55, K55, N80 type 1 and N80Q, L80, C90, T95, P110, and Q125 Chemical Composition
| Grade | C (Max) | Mn | P (Max) | S (Max) | Si (Max) | Mo (Max) | Cr (Max) | Ni (Max) | Cu (Max) | V (Max) |
| H40 | 0.22 | 0.30-1.00 | 0.03 | 0.03 | 0.45 | – | – | – | – | – |
| J55 | 0.26 | 0.30-1.35 | 0.03 | 0.03 | 0.45 | – | – | – | – | – |
| K55 | 0.26 | 0.30-1.35 | 0.03 | 0.03 | 0.45 | – | – | – | – | – |
| N80 | 0.34 | 0.30-1.50 | 0.03 | 0.03 | 0.45 | 0.2 | 0.5 | 0.5 | 0.5 | 0.08 |
| L80 | 0.43 | 0.30-1.50 | 0.03 | 0.03 | 0.45 | 0.25 | 0.75 | 0.75 | 0.35 | 0.08 |
| C90 | 0.45 | 0.30-1.50 | 0.03 | 0.03 | 0.45 | 0.35 | 1 | 0.5 | 0.5 | 0.1 |
| T95 | 0.45 | 0.30-1.50 | 0.03 | 0.03 | 0.45 | 0.35 | 1 | 0.5 | 0.5 | 0.1 |
| P110 | 0.4 | 0.30-1.50 | 0.03 | 0.03 | 0.45 | 0.35 | 1 | 0.5 | 0.5 | 0.1 |
| Q125 | 0.5 | 0.30-1.50 | 0.03 | 0.03 | 0.45 | 0.5 | 1.5 | 0.5 | 0.5 | 0.1 |
API 5CT J55, K55, N80 type 1 and N80Q, L80, C90, T95, P110, and Q125 Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
| H40 | ≥276 | 414-552 | ≥21 |
| J55 | ≥379 | 517-758 | ≥19 |
| K55 | ≥379 | 517-758 | ≥19 |
| N80 | ≥552 | 689-862 | ≥15 |
| L80 | ≥552 | 655-880 | ≥15 |
| C90 | ≥621 | 689-862 | ≥10 |
| T95 | ≥655 | 724-896 | ≥10 |
| P110 | ≥758 | 862-1034 | ≥10 |
| Q125 | ≥862 | 931-1207 | ≥10 |
Specifications
API 5CT casing is classified based on various parameters such as grade, outer diameter, wall thickness, length, and end finish. Below is a general specification outline:
- Standard: API 5CT
- Material Grades: J55, K55, N80, L80, C90, T95, P110, Q125
- Outer Diameter: Ranges from 4-1/2″ to 20″ (114.3mm to 508mm)
- Wall Thickness: 1.0mm – 30 mm
- Length Range: R1 (4.88m – 7.62m), R2 (7.62m – 10.36m), R3 (10.36m – 14.63m)
- End Types: BTC (Buttress Thread & Coupling), LTC (Long Thread & Coupling), STC (Short Thread & Coupling), and Premium Connections
Grades of API 5CT Casing & Their Applications
API 5CT casing is available in multiple grades, each suitable for specific drilling conditions:
- J55 & K55: Low-cost options with moderate strength, ideal for shallow wells and general-purpose applications.
- N80 (N80-1 & N80Q): Higher strength compared to J55 and K55, suitable for deeper wells.
- L80: Used in sour service wells due to its resistance to hydrogen sulfide (H2S) environments.
- C90 & T95: Designed for high-pressure and corrosive environments in deep well applications.
- P110: High-strength casing used in deep wells with extreme pressure conditions.
- Q125: The strongest casing grade, used for ultra-deep wells requiring maximum strength.
Manufacturing Process
The production of API 5CT casing involves multiple processes to ensure quality and performance:
- Raw Material Selection: High-quality carbon or alloy steel is chosen based on the desired grade.
- Pipe Forming: The steel is processed into seamless or ERW (Electric Resistance Welded) pipe.
- Heat Treatment: Includes normalizing, quenching, and tempering to achieve the required mechanical properties.
- Threading & Coupling: Threads are machined with high precision to ensure a perfect fit with other components.
- Inspection & Testing: Pipes undergo rigorous non-destructive testing (NDT), including ultrasonic testing, hydrostatic testing, and visual inspections.
- Surface Treatment: Pipes are coated or treated to enhance corrosion resistance.
Benefits
- Enhanced Well Integrity: Prevents well collapse and maintains stability.
- Long Service Life: Corrosion-resistant coatings and heat treatments ensure longevity.
- Compliance with API Standards: Ensures high reliability and safety.
- Customizable Specifications: Available in different sizes, grades, and end connections.
- Cost-Effective Solution: Provides durability and performance while reducing maintenance costs.
Applications
API 5CT casing is essential in the oil and gas industry and is used in various applications:
- Oil & Gas Well Construction: Provides structural support to wellbores during drilling and production.
- Deep Well Drilling: Used in high-pressure, high-temperature (HPHT) conditions.
- Onshore & Offshore Drilling: Suitable for both land-based and offshore drilling operations.
- Sour Service Environments: Specialized grades like L80 are resistant to H2S-induced corrosion.
- Geothermal Wells: Can be used for high-temperature geothermal energy extraction.
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