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API Tubing Coupling

Product introduct: Couplings are short lengths of casing or tubing pipe which used to connect two joints of tubing or casing. They are manufactured in accordance with API 5CT & 5B specifications.
Standard: API SPEC 5CT
Thread: EUE、NUE
Size: 1.050”~4-1/2”

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Product Description

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Product Description

API Tubing Couplings are precision-engineered connectors designed to join tubing strings in oil and gas wells, ensuring leak-proof integrity under high-pressure, high-temperature (HPHT), and corrosive conditions. Manufactured to API 5CT/5B standards, these couplings enable secure connections for production tubing, injection strings, and completions equipment. Their robust design minimizes failure risks in critical applications like sour gas wells, deepwater drilling, and hydraulic fracturing.

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Key Features

API-Compliant Threads

Precision-machined to API 5CT/5B standards (e.g., EUE, NU, Vam® Premium).

High-Strength Materials

Forged from alloy steel (e.g., J55, K55, L80, P110), 13Cr, Duplex 2205, or Inconel®.

Robust Sealing

Metal-to-metal or elastomer-enhanced seals for gas-tight performance.

Corrosion Resistance

NACE MR0175-compliant materials for H₂S/CO₂ environments.

Customization

Tailored OD/ID, thread types, and lengths for unique well requirements.

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Applications

Production Tubing: Connect tubing strings in oil, gas, and geothermal wells.
Sour Gas Wells: Duplex/Inconel couplings resist H₂S-induced cracking.
Hydraulic Fracturing: Withstand high-pressure fracturing fluids.
CO2 Injection: Durable in corrosive CO2-enhanced recovery projects.
Deepwater Completions: Engineered for subsea HPHT environments.

| Technical Specifications

Parameter	Specifications
Material	L80, P110, 13Cr, Duplex 2205, Inconel 625
Size Range	1.9″ to 4.5″ OD (standard API tubing sizes)
Thread Types	API EUE, NU, Vam®, Hydril Wedge, Premium
Pressure Rating	5,000 – 20,000 psi
Temperature	-50°F to 400°F (-45°C to 204°C)
Standards	API 5CT/5B, ISO 11960, NACE MR0175

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Comment & FAQ

1. What’s the difference between EUE and NU thread couplings?

A: EUE (External Upset End) has thicker walls at the ends for strength, while NU (Non-Upset) maintains uniform OD.

2. Can API tubing couplings be reused?

A: No – thread deformation post-installation compromises integrity. Always use new couplings.

3. Are couplings compatible with automated torque machines?

A: Yes – precision threads align with robotic make-up systems.

4. Do you provide NACE compliance documentation?

A: Yes – material test reports (MTRs) and NACE MR0175 certifications are included.

5. What’s the lead time for custom sizes?

A: 4–6 weeks for non-stock sizes, depending on material availability.

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Customer Reviews

⭐⭐⭐⭐⭐
“Switched to Vam® Premium couplings in our deepwater wells. Zero leaks and seamless make-up every time.”
– Offshore Drilling Engineer, Brazil

“The 13Cr API 5CT couplings performed flawlessly for 18 months.”

– Project Manager, UAE

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Production package

By carton, wooden case, wooden pallet, or as customer's requirements.