API 5CT N80 oilfield casing is primarily used for drilling and transporting oil and gas in oil and gas wells. Oilfield casing mainly supports the wellbore during drilling and after completion, ensuring the smooth operation of the well and its continued operation after completion. Oilfield casing is the lifeline for maintaining oil well operation. Due to varying geological conditions and complex downhole stress states, tensile, compressive, bending, and torsional stresses act on the casing, placing high demands on its quality. Damage to the casing for any reason can lead to reduced production or even the abandonment of the entire well.
1. Specifications: Outer Diameter: 114.3mm - 508mm (4 1/2" - 20") Wall Thickness: 5.21mm - 16.13mm (9.5PPF - 133PPF)
2. Materials: H40, J55, K55, N80-1, N80-Q, L80-1, L80-9Cr, L80-13Cr, P110, Q125, etc.
3. Standards: API 5CT, GB, ISO11960, GOST
4. Connection Types: STC, LTC, BTC, XC, and Premium connection
5. Length: R1, R2, R3
6. Inspection: NDT and other related rules of API 5CT and 5B
7. Types: Seamless steel pipe, straight seam steel pipe
Mechanical properties
|
Grade |
Tensile Strength(MPa) |
Yield strength(MPa) |
|
N80 |
≥689 |
552～758 |
Specification
|
Steel Grade |
OD (mm) |
WT(mm) |
|||||||
|
- |
- |
Long thread | Short thread | ||||||
|
N80 |
139.7 |
7.72 |
9.17 |
10.54 |
- |
- |
- |
- |
- |
|
- |
177.8 |
4.05 |
9.19 |
10.36 |
11.51 |
12.65 |
13.72 |
- |
- |
|
- |
219.1 |
10.16 |
11.43 |
12.72 |
14.15 |
- |
- |
- |
- |
|
- |
244.5 |
10.03 |
11.05 |
11.99 |
13.44 |
- |
- |
11.43 |
12.57 |
|
- |
273 |
- |
- |
- |
- |
- |
- |
12.19 |
13.06 |
|
- |
339.7 |
- |
- |
- |
- |
- |
- |
- |
- |
