| Customization: | Available |
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| After-sales Service: | as Per Client′s Design |
| Warranty: | 1 Years |
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API 5CT Carbon Steel Pipe
1. Overview
API 5CT is a globally recognized standard by the American Petroleum Institute (API) for carbon and alloy steel casing and tubing used in oil and gas well drilling and completion. These pipes are engineered to withstand extreme downhole conditions, including high pressure, corrosive environments, and mechanical stress. API 5CT pipes are critical for maintaining well integrity and ensuring efficient hydrocarbon extraction.
2. Key Features
Material Grades:
Common grades: H40, J55, K55, N80, L80, C90, T95, P110.
Group 1: Standard grades (e.g., J55, N80).
Group 2/3: High-strength, corrosion-resistant grades (e.g., L80, C90, T95).
Yield Strength: Ranges from 40 ksi (276 MPa) for H40 to 110 ksi (758 MPa) for P110.
Manufacturing Processes:
Seamless: Produced via hot rolling or cold drawing for superior strength and uniformity.
Welded: ERW (Electric Resistance Welded) or SAW (Submerged Arc Welded) for cost-effective solutions in non-critical applications.
Mechanical Properties:
High tensile and collapse resistance to handle downhole pressures.
Impact toughness for dynamic loads during drilling and production.
Corrosion Resistance:
L80, C90, T95: Sulfide Stress Cracking (SSC) resistant for sour service (H2S environments).
Optional coatings (e.g., epoxy, zinc) for enhanced corrosion protection.
Dimensional Specifications:
Casing Sizes: 4.5″ to 20″ OD, wall thickness up to 1.5″.
Tubing Sizes: 1.05″ to 4.5″ OD, wall thickness 0.125″ to 0.75″.
Thread Types:
API round, buttress, or premium connections (e.g., Hydril) for leak-proof performance.
3. Applications
Oil & Gas Wells:
Casing: Stabilizes wellbores and prevents collapse.
Tubing: Transports oil, gas, or injection fluids.
Sour Service: HS-rich reservoirs (e.g., L80-13Cr for corrosion resistance).
Hydraulic Fracturing: High-pressure fluid delivery in shale gas operations.
Geothermal Wells: High-temperature steam and brine transport.
4. Advantages Over Alternatives
API Compliance: Guaranteed performance under ISO 11960 and API Monogram certification.
Tailored Solutions: Grades optimized for depth, pressure, and environmental challenges.
Cost Efficiency: Welded options reduce costs for shallow or non-critical wells.
Global Acceptance: Preferred in North American shale, Middle Eastern oilfields, and offshore projects.
5. Limitations
Cost: High-grade seamless pipes (e.g., P110) are expensive.
Welded Pipe Restrictions: Limited to low-pressure or non-sour applications.
Weight Handling: Thick-walled casing requires heavy machinery for installation.
6. Standards & Certifications
API 5CT 10th Edition: Specifies chemical composition, mechanical tests, and inspection protocols.
NACE MR0175/ISO 15156: Compliance for sour service environments.
Non-Destructive Testing (NDT): Ultrasonic, hydrostatic, and electromagnetic inspection.
7. Market Positioning
API 5CT pipes dominate the oil and gas sector, particularly in:
Shale Exploration: High-volume hydraulic fracturing in North America.
Offshore Drilling: Corrosion-resistant grades for subsea wells.
Middle East & Asia: Conventional oilfield development and enhanced recovery projects.
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