+8615674993216
sales@forever-steels.com
English
العربية
API 5CT Oil Tubing (OCTG)
Our API 5CT Tubing is the primary conduit used to transport crude oil and natural gas from the producing formation to the surface. Engineered for durability, our tubing strings are designed to withstand the combined stresses of high-pressure fluid flow, corrosive environments, and deep-well mechanical loads.
1. Technical Specifications
Outside Diameter (OD):1.050" to 4-1/2" (26.67mm – 114.3mm)
Wall Thickness (WT):2.87mm – 16.0mm
Length Range:R1 (6.10m-8.53m),R2 (8.53m-9.75m), R3 (9.75m-12.80m)
Manufacturing Process:Seamless (SMLS) or Electric Resistance Welded (ERW)
2. Material Grades & Service Environments
We offer a complete range of API grades tailored to specific downhole conditions:
Standard Service:H40, J55, K55, N80-1, N80-Q
Sour Service (H2S Resistance):L80-1, C90, T95
Corrosion Resistance (CO2/Brine):L80-9Cr, L80-13Cr
High Strength:P110
3. Connection & Threading Types
Available in non-upset (NUE) and external upset (EUE) configurations to ensure maximum joint strength:
EUE (External Upset End):Reinforced ends for higher tensile strength in deep wells.
NUE (Non-Upset End):Used for shallower or lower-pressure applications.
Premium Connections:Special gas-tight threads for high-pressure gas wells and thermal recovery.
4. Key Applications
Production Strings:The main flow path for oil and gas extraction.
Injection Wells:Used for water or gas injection in Enhanced Oil Recovery (EOR).
Workover & Completion:Essential for well maintenance and intervention services.
5. Quality Control & Surface Treatment
Testing:100% Non-Destructive Testing (NDT), Hydrostatic pressure testing, and Drift testing (Full Length Drift).
Surface Protection:External black painting, vanish coating, and internal lining (optional) for corrosion prevention.
Packaging:Steel-strapped bundles with heavy-duty thread protectors; color-coded bands for grade identification according to API 5CT.
Tubing pipe specifications chart
| Nominal OD (inch) | OD (mm) | Wall Thickness (mm) | Nominal Weight (lb/ft - PPF) | Linear Weight (kg/m) | Common Thread Types |
| 1.05 | 26.67 | 2.87 | 1.14 | 1.7 | NU |
| 1.315 | 33.4 | 3.38 | 1.7 | 2.53 | NU, EU |
| 1.66 | 42.16 | 3.56 | 2.3 | 3.42 | NU, EU |
| 1.9 | 48.26 | 3.68 | 2.75 | 4.09 | NU, EU |
| 2-1/16 | 52.4 | 3.91 | 3.25 | 4.84 | IJ (Integral Joint) |
| 2-3/8 | 60.33 | 4.24 | 4 | 5.95 | NU, EU, PH6, FJ |
| 2-3/8 | 60.33 | 4.83 | 4.6 | 6.85 | NU, EU, PH6 |
| 2-3/8 | 60.33 | 6.27 | 5.8 | 8.63 | EU, PH6, FJ |
| 2-7/8 | 73.03 | 5.51 | 6.4 | 9.52 | NU, EU, PH6, FJ |
| 2-7/8 | 73.03 | 7.01 | 7.9 | 11.76 | EU, PH6, FJ |
| 2-7/8 | 73.03 | 8.64 | 9.35 | 13.91 | EU, PH6 |
| 3-1/2 | 88.9 | 5.49 | 7.7 | 11.46 | NU |
| 3-1/2 | 88.9 | 6.45 | 9.2 | 13.69 | NU, EU, PH6, FJ |
| 3-1/2 | 88.9 | 7.34 | 10.2 | 15.18 | EU, PH6, FJ |
| 3-1/2 | 88.9 | 9.22 | 12.7 | 18.9 | EU, PH6, FJ |
| 3-1/2 | 88.9 | 11.4 | 15.5 | 23.07 | EU, PH6 |
| 4 | 101.6 | 5.74 | 9.5 | 14.14 | NU, EU |
| 4 | 101.6 | 6.65 | 11 | 16.37 | NU, EU, FJ |
| 4-1/2 | 114.3 | 5.69 | 10.5 | 15.63 | NU |
| 4-1/2 | 114.3 | 6.35 | 11.6 | 17.26 | NU, EU, BTC |
| 4-1/2 | 114.3 | 7.37 | 13.5 | 20.09 | EU, BTC, LTC |
| 4-1/2 | 114.3 | 8.56 | 15.1 | 22.47 | EU, BTC, LTC |
| 4-1/2 | 114.3 | 10.54 | 18.9 | 28.13 | EU, PH6 |
Mechanical properties of casing pipe
| Grade Group | Steel Grade | Yield Strength Rt 0.5% (psi) | Yield Strength (MPa) | Tensile Strength Rm (min psi) | Tensile Strength (min MPa) |
| Group 1 | H40 | 40,000 – 80,000 | 276 – 552 | 60,000 | 414 |
| J55 | 55,000 – 80,000 | 379 – 552 | 75,000 | 517 | |
| K55 | 55,000 – 80,000 | 379 – 552 | 95,000 | 655 | |
| N80-1 / N80-Q | 80,000 – 110,000 | 552 – 758 | 100,000 | 689 | |
| Group 2 | L80 (1/9Cr/13Cr) | 80,000 – 95,000 | 552 – 655 | 95,000 | 655 |
| C90 | 90,000 – 105,000 | 621 – 724 | 100,000 | 689 | |
| T95 | 95,000 – 110,000 | 655 – 758 | 105,000 | 724 | |
| C110 | 110,000 – 120,000 | 758 – 827 | 115,000 | 793 | |
| Group 3 | P110 | 110,000 – 140,000 | 758 – 965 | 125,000 | 862 |
| Group 4 | Q125 | 125,000 – 150,000 | 862 – 1,034 | 135,000 | 931 |
API 5CT Steel Grades_ Properties & Composition
| Chemical Components (%) | ||||||||
| Steel Grade | C | Mn | Mo | Cr | Ni | P (max) | S (max) | Si (max) |
| H40 | - | - | - | - | - | 0.03 | 0.03 | - |
| J55 | - | - | - | - | - | 0.03 | 0.03 | - |
| K55 | - | - | - | - | - | 0.03 | 0.03 | - |
| N80-1/Q | - | - | - | - | - | 0.03 | 0.03 | - |
| L80 (Type 1) | 0.43 | 1.9 | - | - | 0.25 | 0.03 | 0.03 | 0.45 |
| L80 (9Cr) | 0.15 | 0.30–0.60 | 0.90–1.10 | 8.0–10.0 | 0.5 | 0.02 | 0.01 | 1 |
| L80 (13Cr) | 0.15–0.22 | 0.25–1.00 | - | 12.0–14.0 | 0.5 | 0.02 | 0.01 | 1 |
| C90 (Type 1) | 0.35 | 1.2 | 0.25–0.85 | 1.5 | 0.99 | 0.02 | 0.01 | 0.45 |
| T95 (Type 1) | 0.35 | 1.2 | 0.25–0.85 | 1.5 | 0.99 | 0.02 | 0.01 | 0.45 |
| C110 | 0.35 | 1.2 | 0.50–1.00 | 0.40–1.50 | 0.99 | 0.02 | 0.01 | 0.45 |
| P110 | - | - | - | - | - | 0.03 | 0.03 | - |
| Q125 | 0.35* | 1.35 | 0.85 | 1.5 | 0.99 | 0.02 | 0.01 | 0.45 |
Oil Casing &Tubing (Octg) Production Process
