API 5CT Steel Seamless OCTG Tubings
API 5CT Seamless Steel Tubing Product Description
As a vital component of Oil Country Tubular Goods (OCTG), API 5CT Tubing works as the inner production string installed inside casing, forming an integrated OCTG system with casing instead of two separate products. Casing acts as a structural wellbore liner for support and zonal isolation post-cementing, while tubing is a retrievable flow conduit for conveying produced fluids.
Our API 5CT Tubing strictly complies with the latest API SPEC 5CT 11th Edition (released Dec 2023, effective Dec 19, 2024) and ISO 11960 standards. It is a specialized seamless steel pipe, made via precision hot rolling and cold drawing processes with a weldless structure, enabling it to withstand extreme downhole conditions-high pressure, high temperature (HPHT), corrosive media (CO₂, H₂S), and mechanical stress.
Its core function is to form a sealed flow path between the reservoir and the surface, ensuring safe and efficient hydrocarbon transportation. It also supports downhole equipment and maintains wellbore integrity, making it indispensable for oil and gas well drilling, completion, production, as well as geothermal and water wells. We are committed to providing reliable, high-performance tubing, with every piece undergoing rigorous testing to meet international standards and customer needs.
Whether you need standard OCTG API 5CT Tubing or customized solutions for special working conditions, our professional team is ready to serve you. Feel free to contact us to get a competitive quote, detailed technical parameters, and personalized product recommendations!
OCTG Tubing Pipe Core Technical Requirements
| Category | Core Technical Requirements & Parameter Details |
|---|---|
| Chemical Composition | Strictly controlled element content.1. Conventional grades: Carbon: 0.34–0.43%; Phosphorus ≤0.030%; Sulfur ≤0.030%.2. L80-13Cr: Chromium: 12–13.5%.3. Niobium (Nb) content is listed in all material test certificates. |
| Mechanical Properties |
Yield Strength: 379MPa – 965MPa. Tensile Strength: ≥517MPa. Elongation: 18%–32%. Coupling impact energy of C90, T95 and other grades is greatly optimized. |
| Dimensional Tolerance |
1. Outer Diameter (≤101.6mm): Tolerance ±0.79mm. 2. Wall Thickness Tolerance: 0 ~ -12.5%. 3. Pipe end ovality after sizing: ≤0.5%. |
| Mandatory Testing | Each pipe joint is subject to 8 rigorous tests, including hydrostatic pressure test, flattening test, sulfide stress corrosion cracking (SSC) test, tensile test and thread inspection, to ensure zero product defects. |
| Full Lifecycle Traceability | Each pipe is marked with steel grade, dimension, manufacturer, heat number and other information. The heat number is in one-to-one correspondence with performance data to realize full lifecycle traceability. |
Tubing Pipe Core Product Parameters: Steel Grades, Specifications & Thread Types
Our OCTG API 5CT Tubing covers a full range of steel grades, specifications, and thread types, customizable according to customer-specific working conditions (well depth, pressure, medium corrosiveness). Key parameters of our Seamless Tubing API 5CT Steel are as follows:
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Steel Grade Classification (Suitable for Different Working Conditions)
|
Steel Grade Type |
Specific Steel Grades |
Core Performance |
Application Scenarios |
|---|---|---|---|
|
Conventional Strength Grade |
Yield strength 379MPa, conventional corrosion resistance, cost-effective, suitable for mass production of API 5CT Seamless Tubing (Steel) |
H40: Low-pressure shallow wells (<1500m); J55/K55: Medium-pressure conventional wells, general oilfield operations |
|
|
Corrosion-Resistant Grade |
L80 Series (L80-3Cr, L80-9Cr, L80-13Cr) |
Excellent resistance to CO₂/H₂S corrosion, surface treated with environmentally friendly coating, high toughness, a premium option of Steel Seamless Tubings API 5CT |
Highly corrosive oil and gas fields, sour-service wells; L80-13Cr can withstand H₂S partial pressure >0.0003MPa environments |
|
High-Strength Grade |
N80 (Ordinary/Tempered Type), P110 |
N80: Yield strength 552-758MPa; P110: Yield strength 758-965MPa, high pressure-bearing capacity, the high-strength type of API 5CT Grade Seamless Steel Tubing |
N80: Medium-deep wells (1500-4000m); P110: Ultra-deep wells, HPHT wells, harsh downhole conditions |
|
Special High-Strength Grade |
C90, T95, Q125, C125 |
Q125: Maximum yield strength 1034MPa; C125: Tensile strength ≥862MPa, extreme pressure resistance |
Ultra-deep wells, extreme HPHT environments, complex geological conditions, critical oilfield operations |
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Specifications (Customizable)
| Item | Technical Specifications |
|---|---|
| Outer Diameter (OD) | 1.050" – 4.5" (26.67mm – 114.3mm)Conventional range: 2.375" – 4.5" (60.3mm – 114.3mm) |
| Wall Thickness | 0.133" – 0.500" (3.38mm – 12.7mm)Tolerance: 0 ~ -12.5% (compliant with API 5CT) |
| Length | R1: 6.10–7.32mR2: 8.53–9.75mR3: 11.58–12.80mCustomized lengths are available upon request |
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Thread Types (Compliant with API 5B Standard)
Non-Upset Tubing (NUE): Suitable for low to medium pressure scenarios, specifications 1.050TBG to 4.5TBG, simple structure and easy installation.
External Upset Tubing (EUE): Thickened thread design, higher joint strength and pressure-bearing capacity, suitable for high-pressure wells and deep wells, the most commonly used thread type.
Premium Gas-Tight Connections: Optional for high-pressure gas wells and sour-service wells, replacing VAM Top, New VAM, and other premium connections to ensure leak-tight performance.
All threads feature a 60° thread angle and 1:16 taper, with pitch tolerance ±0.051mm, ensuring reliable sealing and interchangeability.
Why Choose Our OCTG API 5CT Tubing?
- Strict Standard Compliance: Fully meets API SPEC 5CT 11th Edition and ISO 11960 standards, with API certification available; supports third-party inspection (SGS, BV, etc.) to ensure product qualification.
- Superior Performance: Weldless structure ensures high pressure-bearing capacity and corrosion resistance; customizable steel grades and specifications to adapt to various harsh downhole conditions (HPHT, sour service, ultra-deep wells).
- Precision Manufacturing: Adopts advanced hot rolling and cold drawing processes, with precise dimensional control and smooth surface; strict pipe end treatment and thread machining ensure leak-tight connections and avoid stress concentration.
- Reliable Quality Control: Every joint undergoes comprehensive testing (hydrostatic, NDT, tensile, SSC, etc.); full lifecycle traceability system ensures product quality is controllable and traceable at every stage.
- Cost-Effective & Customizable: Competitive pricing with no middlemen; supports custom steel grades, specifications, lengths, and surface treatments (anti-corrosion coating) to meet unique customer needs, reducing operational costs and improving efficiency.
- Wide Application Range: Suitable for onshore/offshore oil and gas wells, shallow/deep/ultra-deep wells, sour-service wells, HPHT wells, geothermal wells, and water wells, covering the entire oil and gas extraction process.
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FAQ
Q: What is the key difference between API 5CT Tubing and Casing Pipe in terms of application and service life?
A: The core difference lies in their roles and service cycles. API 5CT Tubing is the inner production string, used to transport produced fluids (crude oil, natural gas) from the well to the surface, and it is retrievable for workover operations. Casing Pipe is a structural liner下入 the wellbore, cemented in place to stabilize the wellbore and isolate formations, and it remains permanently in the well for its entire service life. Additionally, tubing focuses on fluid conveyance, while casing focuses on wellbore protection.
Q: How do the mechanical properties of different API 5CT Tubing steel grades differ, and how to choose the right one for my well conditions?
A: Mechanical properties vary by steel grade: H40/J55 (yield strength 379-552MPa) for low/medium-pressure shallow wells; L80 series (552-758MPa) for corrosive sour-service wells; N80/P110 (552-965MPa) for medium-deep/ultra-deep wells; Q125/C125 (862-1034MPa) for extreme HPHT environments. Choose based on well depth, downhole pressure/temperature, and medium corrosiveness (e.g., CO₂/H₂S content).
Q: What is the difference between API 5CT Tubing and Drill Pipe, and can they be used interchangeably?
A: They cannot be used interchangeably. API 5CT Tubing serves the production phase, acting as a retrievable fluid conduit with strict corrosion and pressure resistance requirements. Drill Pipe serves the drilling phase, connecting the drill bit and surface equipment to transmit power and drilling fluid, focusing on torsion, bending, and vibration resistance. Their material, mechanical properties, and structural design are tailored to their respective working scenarios.
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