API 5CT TUBING AND CASINGS

We can supply you with all kinds of OCTG of API standard as well as premium connections. Such as Casing of VAM, BTC, LTC, STC; Tubing of EUE, NUE. With steel grades of J55, K55, L80, N80, P110 and so on.

1. Product Definition

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  Casing: Structural pipe (OD 4.5"–20") with SC/LC/BC connections, cemented to stabilize formations and isolate pressure zones. Grades: J55 (shallow), P110 (ultra-deep)

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  Tubing: Conduit (OD 2⅜"–4½") with NU/EU ends, transporting hydrocarbons. L80-13Cr resists H₂S corrosion; P110 handles high-pressure flows

• 2. Key Applications
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  Casing:

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    Surface: J55 in shallow wells (≤1,500m) for aquifer protection

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    Intermediate: L80 BC in salt-gypsum layers (Middle East)

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  Tubing:

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    Sour Gas Wells: L80-13Cr EU (Sichuan Field, H₂S >0.1MPa)

    
    
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    Thermal Wells: P110 EU for steam injection (≤300°C, Canadian oil sands).

3. Standards & Compliance

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  API 5CT PSL-2/3: Mandates SSC testing (NACE TM0177) for sour service

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  Dimensional Tolerance: OD ≤101.60mm: ±0.79mm; OD ≥114.30mm: +1.0%/-0.5%