API 5CT N80 oil well casing pipe
Usage:Oil Gas Sewage Transport
MOQ:1 Ton
Packing:Standard Seaworthy Packing
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API 5CT N80 oil well casing pipe
N80 oil well casing is typically used in medium-deep wells or oil and gas extraction environments with relatively stable geological conditions. Its good mechanical properties and moderate cost make it a cost-effective option in conventional oil and gas field development. During installation, N80 casing is connected by threads to form a continuous tubing string. After being run into the wellbore, it is cemented to provide permanent support to the wellbore. Compared to higher grades such as P110, N80 has slightly lower tensile strength and crush resistance, but superior ductility and weldability, making it suitable for complex well configurations.
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| N80 | ≥689 | 552–758 | ≥0.5 | -- |
Chemical Composition
| Element | C | Si | Mn | P | S | V | Cr/Ni/Cu/Mo (Total) |
|---|---|---|---|---|---|---|---|
| Content (%) | 0.34–0.38 | 0.20–0.35 | 1.45–1.70 | ≤0.020 | ≤0.015 | 0.11–0.16 | ≤0.15 |
Common Dimensions and Sizes
| Grade | Outer Diameter (mm) | Wall Thickness (mm) – Long Thread | Wall Thickness (mm) – Short Thread |
|---|---|---|---|
| N80 | 139.7 | 7.72, 9.17, 10.54 | - |
| N80 | 177.8 | 4.05, 9.19, 10.36, 11.51, 12.65, 13.72 | - |
| N80 | 219.1 | 10.16, 11.43, 12.72, 14.15 | - |
| N80 | 244.5 | 10.03, 11.05, 11.99, 13.44 | 11.43, 12.57 |
| N80 | 273.0 | - | 12.19, 13.06 |
API 5CT Casing Pipe Technical Parameters Comparison (J55 VS N80 VS P110)
| Parameter | J55 | N80 | P110 |
|---|---|---|---|
| Grade Definition | Low-strength casing for shallow to medium-depth wells | Medium-strength casing for moderate depth and higher pressure | High-strength casing for deep and ultra-deep wells |
| Yield Strength (MPa) | 379 – 552 | 552 – 758 | 862 – 1034 |
| Tensile Strength (MPa) | ≥552 | ≥689 | ≥931 |
| Elongation (%) | ≥20 | ≥0.5 | ≥18 |
| Hardness (HB) | -- | -- | ≤300 (typical) |
| Chemical Composition (Max, %) C / S / P |
C≤0.35 S≤0.045 P≤0.045 |
C≤0.38 S≤0.015 P≤0.020 |
C≤0.35 S≤0.015 P≤0.015 |
| Typical Alloying Elements | - | V, Mn (microalloyed) | Cr, Mo, Ni, V (high-alloy design) |
| Common Applications | Conventional oil/gas wells, low-corrosion environments | Medium-depth wells, higher pressure zones | Ultra-deep wells, HPHT (high pressure & high temperature), offshore platforms |
| Corrosion Resistance | Standard | Moderate | Enhanced (especially with Cr/Mo variants) |
| Cost Level | Low | Medium | High |
| Manufacturing Process | Seamless / ERW / HFW | Seamless / ERW / HFW (economic N80 available) | Seamless / HFW with strict heat treatment |
FAQ
What size is N80 casing?
N80 casing covers a variety of sizes from small to large diameters. Common outer diameters for N80 casing are: 4-1/2", 5-1/2", 6-5/8", 7", 9-5/8", and 13-3/8". Common outer diameters for N80 tubing are: 2-3/8", 2-7/8", 3-1/2", 4", and 4-1/2".
What is the yield strength of N80?
Yield Strength: N80 has a minimum yield strength of 80,000 psi, making it suitable for medium to high-pressure oil and gas wells. Chemical Composition: It is alloyed with elements such as chromium and nickel to enhance its mechanical properties and corrosion resistance.
What are the grades of API 5CT?
According to American Petroleum Institute Standard API SPEC 5CT1988 1st edition, the steel grade of API 5CT oil casing pipe can be divided into ten types, including H-40, J-55, K-55, N-80, C-75, L-80, C-90, C-95, P-110 and Q-125.
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