API 6A HPHT 25000psi (175MPa) Wellhead & Christmas Tree for Severe Sour Service (HH Grade)

  • Ultra-deep gas reservoirs and extreme sour environments (25,000Psi /172.5 MPa) cause severe valve seal degradation and casing integrity failure under intense thermal cycling.
  • Built upon 20+ years of high-pressure R&D, our API 6A certified 175 MPa wellhead Christmas trees and gate valves feature optimized finite-element mechanical modeling, premium HH-grade materials, and automated surface control.
  • Field-proven in critical deep gas exploration wells for continuous, high-integrity shut-in, testing, and production.
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Main Advantage & Solution

  • Catastrophic hydrogen embrittlement and sulfide stress cracking (SSC) under extreme 175MPa pressure.
    Solution: Built with severe-service forged alloy steel compliant with NACE MR0175, with critical components fully cladded using Austrian Fronius automated TIG overlaying systems (Material Grade up to HH-NL).
  • Violent abrasive erosion from high-velocity fracturing sand or flowback slurry.
    Solution: Gate and seat sealing surfaces are supersonic flame-sprayed (HVOF) with specialized Tungsten Carbide (WC), ensuring perfect

Application Scenarios

  • For HPHT Deep Well Explorations: Engineered for ultra-deep gas wells exceeding 140~175 MPa reservoir pressures, ensuring long-term pressure containment.
  • For Shale Gas Extreme Fracking: Master flow and pressure management during continuous, heavy-sand multi-stage fracturing backflows.
  • Automated Surface Well Testing & Flowback: Integrates with automated electric/hydraulic actuated gate valves and choke manifolds for dynamic well testing and automated shut-in controls.
  • Y-Type Tree Configurations: Optimized Y-type Christmas tree designs for high-velocity sour gas production with minimized fluid turbulence and erosion.

Technical Specifications

SpecificationDetails
Max Working Pressure25,000 Psi (172.5MPa / 175 MPa ultra-high pressure class)
Gate Valve Nominal Bore2-1/16” (52mm) to 7-1/16” (180mm)
Flange Size Range2-1/16” to 13-5/8”
Material ClassAA, BB, CC, DD, EE, FF, HH (Severe Sour Service)
Temperature ClassK – X (-60°C to 180°C)
PSL/PR VerificationPSL 3~4; DNV Witnessed Gas PR2 Certified

Our Advantages

Factory Strength

Backed by 20+ years of 140~175 MPa HPHT equipment R&D; holds national invention patents for electric choke control systems; fully equipped with heavy alloy steel forging, CRA inlay welding, and 25,000 Psi hydrostatic/gas test bays.

Customization Service

Customized wellhead configurations including Y-Type gas trees, motorized/electric gate valve actuation, specialized tubing head spools, and full Inconel 625 CRA cladding for extreme sour environments.

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