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Help CenterSteel Pipe & Tube & Petroleum Steel Pipe，L245、L360、X60、X70、J55、N80、L80、P110
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1. Material System of Oil Tubing
The material of oil tubing is the core factor determining product performance. Different materials are applied to oil & gas transmission pipes and special petroleum pipes for various working conditions.
Our product range covers carbon steel, low-alloy steel and corrosion-resistant alloy steel, fully meeting the demands for oil tubing used in conventional oilfields as well as oilfields with high sulfur and severe corrosion.
Carbon steel oil tubing grades such as L245, L290 and L360 are mainstream materials for oil & gas transmission pipes. Featuring stable cost and excellent weldability, they are widely used in conventional gathering and transmission pipelines.
Low-alloy steel oil tubing including N80, L80 and P110 serves as the key material for special petroleum pipes. With added chromium, manganese, molybdenum and other elements, it boasts high strength, good toughness and excellent collapse resistance, suitable for complex stress environments downhole.
Corrosion-resistant alloy oil tubing like 13Cr, Super 13Cr and duplex stainless steel are customized for harsh working conditions. Such materials are ideal for oil & gas transmission pipes and special petroleum pipes in oilfields with high sulfur and carbon dioxide content, effectively resisting medium corrosion and extending service life.
All materials of oil tubing comply strictly with international standards including API, ASTM and ISO. Material analysis reports can be provided to guarantee compliance for overseas projects.
2. Model & Standards of Oil Tubing
2.1 Models for Oil & Gas Transmission Pipes
API 5L is the most widely adopted standard for oil & gas transmission pipes. It covers a full series of steel grades from L175 to X120, which is the preferred standard model of oil tubing for global long-distance oil and gas pipeline projects.
X42, X52, X60, X65, X70 and X80 are the most commonly used models of oil & gas transmission pipes in foreign trade orders. Each steel grade corresponds to specific pressure levels and transmission distances, applicable to onshore, subsea and other working scenarios.
Low-temperature resistant oil & gas transmission pipes under API 5L standard are available for cold regions. They are designed with improved low-temperature impact toughness to prevent brittle fracture of oil tubing.
2.2 Models for Special Petroleum Pipes
API 5CT is the core standard for special petroleum pipes, covering a complete range of steel grades for tubing and casing. It is the universal international standard for downhole oil tubing.
Mainstream models of special petroleum pipes include J55, K55, N80, L80, C90, T95, P110 and Q125, matching different downhole pressure and corrosion conditions. Among them, N80, L80 and P110 are the most popular special petroleum pipes for regular oilfield projects.
API 5DP is the dedicated standard for drill pipe type special petroleum pipes. Typical models such as E75, X95, G105 and S135 fit drilling operations at different depths, which are indispensable oil tubing for drilling engineering.
2.3 Custom Models
Apart from standard specifications, we can customize oil tubing with special steel grades and performance, including non-API oil & gas transmission pipes and special petroleum pipes to satisfy requirements of special oilfields and extreme working conditions.
3. Size & Dimension Parameters of Oil Tubing
3.1 Dimensions of Oil & Gas Transmission Pipes
Diameter: Seamless oil & gas transmission pipes range from DN15 to DN650. Welded oil & gas transmission pipes are available in DN200 to DN3000, covering pipeline demands from oilfield gathering lines to cross-regional long-distance pipelines.
Wall thickness: The wall thickness of oil & gas transmission pipes is 2.5mm to 60mm. Custom wall thickness is available according to transmission pressure and burial depth to ensure the strength and stability of oil tubing.
Length: Standard fixed lengths are 6m and 12m. Non-fixed length and customized fixed length are also acceptable to adapt to on-site installation.
3.2 Dimensions of Special Petroleum Pipes
Casing type special petroleum pipes: Outer diameter from 4-1/2" to 20", wall thickness 5.0mm to 25.4mm. Three standard length ranges: R1 (4.88~7.62m), R2 (7.62~10.36m), R3 (10.36~14.63m). Clients can select proper oil tubing based on well depth and borehole pressure.
Tubing type special petroleum pipes: Outer diameter from 1.05" to 4-1/2", wall thickness 3.18mm to 10.54mm. Thread types include EU (External Upset), NU (Non-Upset) and premium connections, meeting different oil production demands.
Drill pipe type special petroleum pipes: Outer diameter from 2-3/8" to 6-5/8", wall thickness 9.19mm to 15.49mm. Standard length is R2 (about 9.14m). This kind of oil tubing is the key component for torque transmission and mud circulation during drilling.
3.3 Custom Dimensions
We can produce non-standard oil tubing with customized diameter, wall thickness and length per drawings and working parameters. Custom processing such as thread and bevel is available for oil & gas transmission pipes and special petroleum pipes to realize one-stop procurement.
4. Matching Reference of Material, Model & Size
| Product Type | Steel Grade | Standard | Common Size Range | Application Scenario |
|---|---|---|---|---|
| Oil & Gas Transmission Pipe | L245, L360, X60, X70 | API 5L PSL1/PSL2 | DN200~DN1400, Wall Thickness: 6~25mm | Onshore long-distance pipeline, Oilfield gathering pipeline |
| Special Petroleum Pipe - Casing | J55, N80, L80, P110 | API 5CT | 7"~13-3/8", Wall Thickness: 7~15mm | Completion work for shallow, medium and deep oil wells |
| Special Petroleum Pipe - Tubing | N80, L80, 13Cr | API 5CT | 2-3/8"~3-1/2", Wall Thickness: 3~7mm | Fluid transmission and downhole operation for production wells |
| Special Petroleum Pipe - Drill Pipe | G105, S135 | API 5DP | 3-1/2"~5-1/2", Wall Thickness: 9~12mm | Regular and deep well drilling |
| Corrosion-resistant Oil & Gas Transmission Pipe | 13Cr, Duplex Stainless Steel | API 5L X65/X70 | DN100~DN800, Wall Thickness: 8~20mm | Pipeline for high-sulfur and corrosive oil & gas fields |
5. Foreign Trade Supporting Services & Delivery Cycle
Pre-processing services are provided for oil tubing, including beveling, threading and anti-corrosion coating. Oil & gas transmission pipes and special petroleum pipes can be put into use directly after arrival at project sites.
All oil tubing adopts export-grade packaging. Seamless oil & gas transmission pipes and special petroleum pipes are bundled with woven bags and steel strips. Large-diameter welded oil & gas transmission pipes are fitted with pipe end protectors and fixed on wooden supports to avoid deformation and thread damage during transit.
Complete foreign trade documents are supplied, including material certificates, API certificates, factory inspection reports, commodity inspection documents and customs declaration files. These documents ensure smooth customs clearance and timely commissioning of your purchased oil tubing, oil & gas transmission pipes and special petroleum pipes.
Delivery Cycle
Standard specifications of oil tubing, conventional oil & gas transmission pipes and regular special petroleum pipes in stock: Delivery within 3-7 working days after receiving deposit.
Standard products without stock: Production and delivery within 15-25 working days.
Customized oil tubing, special material, special size and high anti-corrosion oil & gas transmission pipes / special petroleum pipes: Delivery within 25-40 working days.
For large bulk orders, we can negotiate a flexible delivery schedule according to order quantity.
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