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Help CenterSteel Pipe & Tube & Petroleum Steel Pipe，H40/J55/K55、N80、L80、C90/T95、P110、Q125/V140/V150
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Steel Pipe & Tube & Petroleum Steel Pipe，H40/J55/K55、N80、L80、C90/T95、P110、Q125/V140/V150NegotiableMOQ: 5 Metric Tons -
Steel Pipe & Tube & Petroleum Steel Pipe，H40/J55/K55、N80、L80、C90/T95、P110、Q125/V140/V150NegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & Petroleum Steel Pipe，H40/J55/K55、N80、L80、C90/T95、P110、Q125/V140/V150NegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & Petroleum Steel Pipe，H40/J55/K55、N80、L80、C90/T95、P110、Q125/V140/V150NegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & Petroleum Steel Pipe，H40/J55/K55、N80、L80、C90/T95、P110、Q125/V140/V150NegotiableMOQ: 5 Metric Tons
Detailed Description of Petroleum Pipes
Petroleum pipes, also known as oilfield pipes, are core special steel pipes for oil and gas exploration and development. They mainly include Casing, Tubing, Drill Pipe and Line Pipe, widely used in drilling, well completion, oil and gas transmission and other projects. They can stably serve in underground environments with high temperature, high pressure, strong corrosion and complex stress conditions. Below is a full introduction covering classification, steel grades, specifications, standards, performance, production process and application scope.
1. Main Classification & Applications
1.1 Oil Casing
It is steel pipe used to support oil and gas well walls, prevent well wall collapse, isolate formation fluids and protect wellhead facilities. It is a major consumable pipe accounting for over 70% of total oilfield pipe consumption.
Conductor Casing: Outermost layer, fix wellhead and prevent shallow stratum collapse, outer diameter: 406.4–508mm
Surface Casing: Isolate shallow water layer and protect fresh water resources, outer diameter: 244.5–339.7mm
Intermediate Casing: Separate complex formations such as salt rock and high-pressure water layer, outer diameter: 139.7–193.7mm
Production Casing: Form main channel for oil and gas exploitation, directly affect production capacity, outer diameter: 114.3–139.7mm
1.2 Oil Tubing
Suspended inside casing, used to transport underground oil and gas to the ground with reusable features. Classified into Non-upset Tubing (NU) and External-upset Tubing (EU) for different pressure working conditions.
1.3 Drill Pipe
Connect drilling rig and drill bit, transmit torque and circulate drilling fluid, including drill collar, kelly bar and other matching parts.
1.4 Line Pipe
Applied for long-distance oil and gas transmission on land and seabed, divided into seamless pipe and welded pipe (ERW/SAW).
2. Material & Steel Grade (API 5CT Standard)
Common Steel Grades and Features
| Steel Grade | Yield Strength (MPa) | Application |
|---|---|---|
| H40/J55/K55 | 276–379 | Shallow wells, low pressure wells, economical type |
| N80 | 552–758 | Medium-deep wells, conventional oil & gas wells |
| L80 | 552–655 | Medium-deep wells, slight corrosion resistance, general mainstream grade |
| C90/T95 | 621–758 | Hydrogen sulfide containing acidic environment, anti-sulfur and anti-cracking |
| P110 | 758–965 | Deep wells & ultra-deep wells, high strength for high pressure |
| Q125/V140/V150 | 862–1172 | Super deep wells, ultra-high pressure extreme working conditions |
Special Anti-corrosion Materials
13Cr / Super 13Cr: Good carbon dioxide corrosion resistance
22Cr / 25Cr: Resist mixed corrosion of CO₂ and H₂S
Nickel-based alloy: Applied in extremely severe corrosion environments
High collapse resistance series: Ideal for salt rock and loose sandstone formations
3. Main Specifications
Oil Casing
Outer diameter: 114.3–508mm (4.5"–20"), wall thickness: 5.0–15.9mm, length: 5.5–22.23m, unit weight: 15–150kg/m
Oil Tubing
Outer diameter: 48.36–114.3mm (1.9"–4.5"), wall thickness: 4.83–9.52mm, length: 6–12.5m, unit weight: 6–30kg/m
Line Pipe (API 5L)
Outer diameter: 60.3–1422mm, wall thickness: 2.5–25mm, steel grade: X42–X80 (L290–L555)
4. Implementation Standards
International Standards
API SPEC 5CT: Core standard for casing and tubing, divided into PSL-1/PSL-2/PSL-3 quality levels
API SPEC 5B: Standard for thread processing and inspection
API 5L: Standard for petroleum line pipes
ISO 11960: Equivalent to API 5CT, widely used in European markets
NACE MR0175: Hydrogen sulfide corrosion resistance certification, mandatory for acidic oil wells
Domestic Standards
GB/T 19830: Chinese standard for oil casing and tubing, equivalent to API 5CT
SY/T 6194: Special standard for petroleum casing pipes
GB/T 9711: Domestic standard for line pipes, consistent with API 5L
5. Core Performance Advantages
High Mechanical Strength: Excellent tensile, compressive and torsional resistance to adapt to complex underground stress
Strong Collapse Resistance: Effectively resist external formation pressure to avoid pipe collapse
Superior Corrosion Resistance: Resist erosion of hydrogen sulfide, carbon dioxide and chloride ions to prevent pipe cracking and damage
Excellent Sealing Performance: Adopt API standard round thread and buttress thread; special premium thread ensures stable connection and zero leakage
High Dimensional Accuracy: Strict tolerance control ensures smooth on-site installation and matching
6. Production Technology
Seamless Petroleum Pipe (Mainstream Product)
Round steel billet heating → piercing → pipe rolling → sizing & reducing → heat treatment (normalizing, quenching and tempering) → precise thread machining → surface treatment → full inspection
Welded Petroleum Pipe
Steel strip forming → high-frequency welding → heat treatment → fixed diameter shaping → thread processing, low cost and stable quality for medium and low pressure use
7. Surface Treatment & Packaging
Surface treatment: Anti-rust paint, internal anti-corrosion coating, epoxy coating
Packaging: Thread protector at both ends, bundled firmly with moisture-proof packing to prevent damage in transit
8. Application Scope
Onshore conventional oil & gas wells: J55, N80, L80 steel grade pipes
Deep & ultra-deep wells: High-strength P110, Q125 series pipes
Acidic corrosive oil & gas fields: Anti-sulfur and anti-corrosion special steel pipes
Long-distance fluid transportation: API 5L standard high-pressure line pipes
Delivery Information
Delivery cycle: 5-7 working days
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