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Help CenterSteel Pipe & Tube & Petroleum Steel Pipe，H40/J55/K55、N80(N80-1/N80Q)、L80 (13Cr-L80)、C90/T95、P110/Q125
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Steel Pipe & Tube & Petroleum Steel Pipe，H40/J55/K55、N80(N80-1/N80Q)、L80 (13Cr-L80)、C90/T95、P110/Q125NegotiableMOQ: 5 Metric Tons -
Steel Pipe & Tube & Petroleum Steel Pipe，H40/J55/K55、N80(N80-1/N80Q)、L80 (13Cr-L80)、C90/T95、P110/Q125NegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & Petroleum Steel Pipe，H40/J55/K55、N80(N80-1/N80Q)、L80 (13Cr-L80)、C90/T95、P110/Q125NegotiableMOQ: 5 Metric Tons
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Product Specification for Oil Country Tubular Goods (OCTG)
Ⅰ. Product Overview
Oil Country Tubular Goods (OCTG) refer to seamless steel pipes specially used for oil & gas well service, mainly divided into Casing and Tubing, which are core materials for oil & gas drilling, well completion and oil production. Manufactured via hot rolling / hot expanding seamless process in strict compliance with API 5CT, API 5B, GB/T19830 and ISO11960, the products are applicable for onshore oilfields, offshore oil & gas wells, shale gas fracturing wells and sour crude wells with corrosive formation fluid.Stock available at Tianjin warehouse; delivery lead time: 5~7 working days; shipped in full container loads with 25MT per container.
1.1 Classification & Application
(1) Casing (Wellbore Supporting Pipe, over 70% of total OCTG consumption)
Conductor Casing: Large outer diameter for wellhead fixation, isolating shallow surface water and loose formation to prevent shallow well collapse, available in sizes from 4-1/2″ to 20″ (114.3mm~508mm).
Intermediate Casing: Seals off complicated formations, high-pressure aquifers and lost-circulation strata to guarantee smooth drilling mud circulation, ideal for deep wells and salt formation wells.
Production Casing: Run into hydrocarbon pay zones and secured by cementing to isolate different oil, gas and water layers, serving as outer protection for downhole tubing.
(2) Tubing (Downhole Fluid Conveyance Pipe)
Installed inside casing to form flow paths for crude oil, natural gas and formation water lifting; also used for downhole water injection and gas injection stimulation. Three end configurations available: Non-Upset End (NU), External Upset End (EU) and Integral Joint (IJ), conventional OD range: 1.9″~4-1/2″ (60.3mm~114.3mm).
Ⅱ. Applicable Standards
American Standard: API Spec 5CT (11th Edition, 2023) (governing chemical composition and mechanical property of pipes), API Spec 5B (governing thread machining, coupling and thread inspection)
Chinese National Standard: GB/T19830-2011 Casing and Tubing for Oil and Gas Wells, fully aligned with technical indicators of API 5CT
Extra specification for corrosive service: NACE MR0175 (for H₂S hydrogen sulfide & CO₂ carbon dioxide corrosion resistance)
Ⅲ. Main Steel Grades & Service Condition
| Grade | Yield Strength (MPa) | Applicable Well Environment |
|---|---|---|
| H40/J55/K55 | 275~379 | Shallow low-pressure conventional wells, fresh-water non-corrosive wells within 2000m depth |
| N80 (N80‑1/N80Q) | 552 | Medium-depth conventional wells; quenched & tempered N80Q features superior toughness for mild sour service |
| L80 (13Cr-L80) | 552 | CO₂ resistant medium & high-temperature wells; 13Cr stainless grade for severe CO₂ corrosive wells |
| C90/T95 | 621 | Medium-high H₂S sour oil & gas wells with resistance against Sulfide Stress Corrosion Cracking (SSCC) |
| P110/Q125 | 758~862 | Ultra-deep wells, high-pressure shale fracturing wells and high collapse resistant formations over 5000m depth |
Raw Round Billet: Premium Mn-alloy steel (37Mn5, 27MnCrV), refined via EAF + LF refining; impurity limit: S ≤0.03%, P ≤0.03%
Ⅳ. Dimension Specifications
4.1 Outer Diameter & Wall Thickness Range
Casing: OD Φ114.3~508mm (4.5"~20"), WT 5.21~22.2mm
Tubing: OD Φ60.3~114.3mm (2-3/8"~4-1/2"), WT 4.83~9.52mmDimensional Tolerance: OD +1.0%/-0.5%D; WT -12.5%; Unit weight +6.5%/-3.5% per API & GB requirements
4.2 Standard Length Range (API R1/R2/R3)
R1: 6.10~7.32m (short length)
R2: 8.53~9.75m (market mainstream, common production length:9.4~9.6m)
R3: 11.58~12.80m (extra long for ultra-deep well project)
4.3 Thread Types
STC: Short Thread Coupling: Cost-effective for shallow low-pressure wells
LTC: Long Thread Coupling: Longer thread engagement for medium-pressure service with better sealing performance than STC
BTC: Buttress Thread Coupling: Dominant grade for deep high-pressure wells with outstanding tensile & collapse resistance
Premium Thread (VAM/Hydril): Custom premium connection: Custom-made for ultra-deep and sour wells with superior gas tightness and anti-disengagement property
4.4 Matching Accessories
Same-grade seamless steel couplings, plastic thread protectors and anti-rust grease.
Ⅴ. Production Flow Chart
Steelmaking & refining → Round billet heating → Piercing & hot rolling → Sizing & straightening → Non-destructive Testing → Heat Treatment (Quench & Temper for N80 and above grades) → Thread machining → Coupling assembly → Hydrostatic pressure test & anti-rust treatment → Marking & warehousing
Full-range inspection: UT Ultrasonic Test, MT Magnetic Particle Test, Hydrostatic Test (Min.70MPa for casing, Min.55MPa for tubing), Charpy impact test and mechanical property verification.
Ⅵ. Product Advantages
High Collapse Resistance: Actual collapse strength exceeds 15% above API standard, effectively preventing pipe deformation in unconsolidated sandstone and ductile salt formation;
Graded Anti-corrosion Performance: Carbon steel grades (J55/N80) for normal wells; L80‑13Cr for CO₂ corrosion; C90/T95 for H₂S sour wells to cover all working conditions;
High Precision Thread: CNC thread turning with 100% full inspection by working & not-working gauges to eliminate downhole leakage risk;
Surface Protection: Exterior coated with black anti-corrosion paint; threads coated with anti-rust grease for moisture & rust prevention during ocean transportation.
Ⅶ. Packing, Shipment & Commercial Terms
Packing: Steel pipes bundled firmly with plastic thread protectors at both ends, loaded in full containers in bare package;
Loading Port & Warehouse: Tianjin Port & Tianjin Warehouse, ready for loading within 5~7 working days after order confirmation;
Payment Term: 30% TT deposit, balance paid before shipment;
Quality Warranty: Original mill test certificate & API inspection report attached for each batch; 12-month quality guarantee after delivery.
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