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Help CenterSteel Pipe & Tube & Petroleum Steel Pipe，J55, K55, N80, L80, C90, T95, P110, Q125
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Steel Pipe & Tube & Petroleum Steel Pipe，J55, K55, N80, L80, C90, T95, P110, Q125NegotiableMOQ: 5 Metric Tons -
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Petroleum Pipe Product Detailed Description
Petroleum pipe is the core special pipe used in the whole industrial chain of petroleum and natural gas exploration, development and transportation. It is divided into two major categories: Oil Country Tubular Goods (OCTG) and Line Pipe, manufactured in accordance with API and Chinese GB standards, featuring high strength, high toughness, corrosion resistance and reliable sealing.
1. Product Classification and Core Application
1.1 Oil Country Tubular Goods (OCTG) – Core for Drilling and Completion
CasingFunction: Reinforce well walls, prevent collapse, isolate formation layers and protect wellheads, accounting for over 70% of petroleum pipe consumption.Specification: Outer diameter 114.3–508mm, wall thickness 5–15.9mm, length 5.5–22.23m.
TubingFunction: Transport oil and gas from the bottom of the well to the ground, including plain end and upset end types.Specification: Outer diameter 48.36–114.3mm, wall thickness 4.83–9.52mm, length 6–12.5m.
Drill PipeFunction: Connect drill bits, transmit torque and drilling fluid, bearing combined loads of tension, compression, torsion and bending.Specification: Outer diameter 60.3–168.3mm, steel grade E75, X95, G105, S135.
1.2 Line Pipe – Long-distance Oil and Gas Transportation
Function: Transport crude oil and natural gas, applied to main pipelines and gathering and transportation pipelines.Specification: Outer diameter 60.3–1422mm, wall thickness 3.2–25.4mm, length 6–18m.
1.3 Other Special Pipes
Drill Collar / Heavy Weight Drill Pipe: Provide drilling pressure and stabilize the drill string.
Petroleum Cracking Pipe / Furnace Pipe: Used for heating furnaces and heat exchangers in refineries (GB 9948).
Geological Drilling Pipe: Used for exploration and coring (YB 235 standard).
2. Material and Steel Grade (API 5CT/5L)
2.1 Common Steel Grades and Properties
J55/K55: Low-pressure shallow well, Yield strength 379MPa, Tensile strength 517MPa.
N80: Medium and deep well, Yield strength 552MPa, Tensile strength 689MPa.
L80: Carbon dioxide corrosion resistance, Yield strength 552MPa, Tensile strength 689MPa.
C90/T95: Hydrogen sulfide stress corrosion resistance, Yield strength 621–655MPa.
P110: High-pressure deep well, Yield strength 758MPa, Tensile strength 862MPa.
Q125/V140: Ultra-deep well / High pressure, Yield strength 862–965MPa.
2.2 Special Materials
13Cr / Super 13Cr: Resist CO₂ corrosion, suitable for high temperature and high CO₂ content wells.
22Cr / 25Cr Duplex Steel: Resist Cl⁻, H₂S and CO₂, applied in severe corrosion environments.
Nickel-based Alloy (Inconel 718): Used for ultra-high temperature and severe corrosion wells.
3. Manufacturing Process and Executive Standards
3.1 Manufacturing Process
Seamless Pipe: Round billet heating → piercing → hot rolling / cold drawing → heat treatment → thread processing, applicable for high pressure and deep wells.
Welded Pipe (ERW/HFW): Steel strip forming → high frequency welding → heat treatment → thread processing, cost-effective, suitable for medium and low pressure wells.
3.2 Core Executive Standards
API 5CT: Specification for casing and tubing (internationally universal).
API 5B: Thread processing, gauging and inspection.
API 5L: Specification for line pipe (PSL1/PSL2).
GB/T 9711: Chinese line pipe standard (equivalent to API 5L).
SY/T 6194: Domestic standard for petroleum casing.
4. Thread Type and Connection Mode
4.1 API Standard Thread
STC (Short Round Thread): Shallow well and low pressure, ordinary sealing performance.
LTC (Long Round Thread): Medium and deep well, good sealing performance.
BTC (Buttress Thread): High-pressure deep well, excellent torsion and tension resistance.
4.2 Premium Special Thread
VAM TOP, BGT1, BGC: Metal-to-metal sealing, high air tightness, corrosion resistance, used for high pressure and sulfur-containing wells.
5. Performance Requirements and Quality Control
5.1 Mechanical Properties
Tensile Property: Yield strength, Tensile strength, Elongation.
Collapse Resistance: Casing external pressure collapse resistance, essential for salt rock layers and loose formations.
Impact Toughness: Charpy V-notch, low temperature crack resistance.
Hardness: HRC ≤23 (sulfur-resistant steel), prevent stress corrosion cracking.
5.2 Corrosion Resistance
H₂S Resistance (NACE MR0175): C90/T95/P110 sulfur-resistant steel.
CO₂ Resistance: L80-13Cr / Duplex Steel.
Cl⁻ Resistance: High chromium / Nickel-based alloy.
5.3 Quality Inspection
Non-destructive Testing: Ultrasonic Testing (UT), Magnetic Particle Testing (MT), Eddy Current Testing (ET).
Hydrostatic Pressure Test: Casing ≥34.5MPa, Tubing ≥69MPa.
Thread Inspection: Thread form, pitch, standoff and sealing surface inspection.
6. Surface Treatment and Coating
Bare Pipe: With anti-rust oil, for conventional environments.
Internal Coating: Epoxy coating (EP), drag reduction and corrosion prevention.
External Coating: 3PE/FBE, anti-corrosion for buried pipelines.
Copper Plating / Zinc Plating: Thread anti-galling and rust prevention.
7. Packaging and Marking
Packaging: Bundled (5–10 pieces per bundle), thread protectors equipped at both ends.
Marking: Steel grade, specification, standard, batch number, factory logo and production date.
8. Application Scenarios and Selection Suggestions
Shallow Well (≤2000m): J55/K55/N80, STC thread, Seamless / ERW pipe.
Medium & Deep Well (2000–4000m): L80/P110, BTC thread, Seamless pipe.
Sulfur-containing Well (H₂S): C90/T95, Special thread, Seamless pipe.
High CO₂ Content Well: 13Cr / Super 13Cr, Special thread.
Long-distance Transmission Pipeline: X60/X70/X80, 3PE coating, ERW / Seamless pipe.
9. Foreign Trade Delivery Core Parameters
Product Name: Oil Country Tubular Goods (OCTG) / Line Pipe
Steel Grade: J55, K55, N80, L80, C90, T95, P110, Q125
Specification: Outer Diameter (OD) × Wall Thickness (WT) × Length
Standard: API 5CT, API 5B, API 5L, GB/T 9711
Thread Type: STC, LTC, BTC, VAM TOP, BGT1
Material: Carbon Steel, Alloy Steel, 13Cr, Duplex Steel, Nickel-based Alloy
Surface Treatment: Bare, Epoxy Coating, 3PE, FBE
Packaging: Bundled with Thread Protectors
Delivery Time: 5–7 days
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