N80 steel pipe is a type of casing specifically designed for oil and gas drilling, primarily used for cementing operations and wellbore support. It conforms to standards such as API 5CT and SY/T6194-96. Its yield strength is 552-758 MPa, tensile strength ≥689 MPa, and the surface must be smooth, corrosion-resistant, and free of folds or cracks.
API 5CT N80 Casing is available in two thread types: short thread and long thread, with specifications including 244.5*11.05*R-2, and lengths in three grades: R-1 (4.88-7.62m), R-2 (7.62-10.36m), and R-3 (over 10.36m). Physical performance testing includes flattening tests, tensile tests, and API hydrostatic tests. Chemical composition requires sulfur and phosphorus content to be ≤0.045%. Couplings conform to API 5CT standards, are available in standard and special clearance types, and are treated with phosphating or blackening processes. Threaded ends must be cut at right angles and rounded.
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API 5CT N80 Casing PipeChemical Composition
|
Grade |
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Cu |
Mo |
|
N80 type 1 / Q |
0.34-0.38 |
0.20-0.35 |
1.45-1.70 |
0.020 |
0.015 |
0.15 |
/ |
/ |
/ |
API 5CT N80 Steel Casing Mechanical Property
|
Grades |
Yield Strength (Mpa) |
Tensile Strength (Mpa) |
Elongation under load, % |
|
N80 type 1 |
552-758 |
689 |
0.5 |
|
N80 type Q |
552-758 |
689 |
0.5 |
API 5CT N80 Oil Tubing Tolerance
|
Item |
Allowable tolerance |
|
|
Outer diameter |
Pipe body |
D≤101.60mm±0.79mm |
|
D≥114.30mm+1.0% |
||
|
-0.5% |
||
|
Wall thickness |
-12.5% |
|
|
Wight |
Single piece |
+6.5%+3.5% |
|
Total weight |
-1.75 |
|
API 5CT N80 Oil Casing Pipe
N80 oil well casing is the "lifeline" in oil and gas well construction, running throughout the entire process of drilling, completion, and production. Specific applications include:
Drilling Support: During drilling, N80 casing forms a stable channel by being run into the wellbore, preventing formation collapse, abnormal pore pressure, or drilling fluid loss, ensuring safe drilling operations. Its high strength (yield strength 552-758 MPa) and internal pressure resistance (≥69 MPa) can withstand the impact of complex geological conditions.
Completion Stage Isolation and Protection: After completion, N80 casing is cemented tightly to the formation, achieving the following functions:
Isolating Formation Fluids: Preventing cross-contamination between oil, gas, and water layers, avoiding resource contamination or production loss.
Constructing a Production Path: Providing support for subsequently run-in tubing, forming a complete flow path from the oil and gas layer to the wellhead.
Protecting Production Casing: In complex formations, technical casing (often made of N80 or higher grade steel) can seal collapsed layers, salt deposits, etc., extending the service life of the production casing.
Adaptation to Special Geological Conditions
High-Temperature and High-Pressure Wells: N80 casing undergoes heat treatment to optimize its metallographic structure, enabling it to withstand high-temperature (e.g., above 150℃) and high-pressure (e.g., above 100MPa) environments.
Corrosive Media Environments: For corrosive oil and gas fields containing H₂S and CO₂, N80 casing can be made of sulfur-resistant steel (e.g., N80Q) or surface coating technology (e.g., nickel-based alloy coating) to enhance corrosion resistance.
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