The Casing Head is an adapter that connects the surface casing string to either the BOP stack or the wellhead. It can be attached via threaded, welded, or slip lock connections to the casing. Additionally, it may have a flanged or clamped connection to match the BOP stack or wellhead. Typically, casing heads are qualified to withstand up to 10,000 psi working pressure. The Casing Head plays a critical role by suspending the casing, packing off the next casing string, providing annular outlets, and supporting the BOP during the drilling of remaining stages. The straight bowl design prevents wedge-locking of bowl protectors, casing hangers, and test plugs, simplifying installation.

Features:

• API Spec 6A Compliant:

  • Designed and manufactured according to API Spec 6A for durability and performance in demanding environments.

• Versatile Casing Hanger Compatibility:

  • Accepts a wide variety of slip and mandrel casing hangers for flexibility in application.

• Three Types of Outlets:

  • Line Pipe, Flanged (Studded), and Extended Flanged outlets offer various connection options for different operational needs.

• Multiple Bottom Connection Options:

  • Available with various bottom connection types such as:

    • Slip-on weld

    • Slip-on weld with O-ring

    • Threaded

    • Sure Lock

• Testing & Quality Assurance:

  • 100% Testing includes:

    • Hardness Test

    • Hydrostatic Testing

    • Ultrasonic Inspection

    • Magnetic Particle (MT) Test

    • Paint Test

  • Comprehensive testing reports are provided for each unit.

Specifications:

 

• Connected Casing O.D.:

  • 7-5/8" ~ 13-3/8" (193.7 mm ~ 339.7 mm)

• Hanger Casing O.D.:

  • 4-1/2" ~ 9-5/8" (114.3 mm ~ 244.5 mm)

• Working Pressure:

  • Ranges from 2000 psi to 20000 psi (14 MPa ~ 140 MPa)

• Vertical Bore:

  • 178" ~ 12-1/2" (178 mm ~ 318 mm)

• Working Pressure (WP):

  • 2000 Psi – 20000 Psi (14 MPa ~ 140 MPa)

• Material Classes (M/C):

  • AA, BB, CC, DD, EE, FF, HH

• Temperature Class (T/C):

1. Design and Construction:

   • Outer Diameter: The dimensions would depend on the size of the flange required, usually based on the API 6A standards.

   • Thickness: The flange thickness will also be based on the size and material class.

   • Bolt Holes: These would be positioned around the perimeter of the flange (the number and size of holes depend on the specific standard and size of the flange).

   • Gasket Sealing Surface: This area would be machined to ensure a proper seal when installed.

   • No Central Hole: The key difference from regular flanges—no opening to allow fluid to pass through.

2. Material Classes and Specifications:

   • Material Classes: BB, CC, DD, EE, FF (various materials like carbon steel, stainless steel, alloy steel).

   • Performance Requirements: PR1, PR2, depending on pressure and temperature requirements.

   • Temperature Class: L-U (used for a specific temperature range).

   • Product Specification Level: PSL1, PSL2, PSL3, PSL4, indicating the quality level and testing requirements.

3. Testing and Quality Assurance:

   • Hardness Test: Ensures the material hardness meets specified standards.

   • MT (Magnetic Test): Ensures there are no surface defects.

   • NT (Nondestructive Testing): Ensures structural integrity without damaging the material.

   • Hydrostatic Test: Checks the pressure withstand capability of the flange.

Now, I’ll outline how to create the drawing:

• View: A side profile and top-down view of the blind flange.

• Dimensions: Include bolt hole locations, outer diameter, thickness, gasket sealing area, and material specifications.

• Labeling: Proper labeling for each feature (e.g., bolt holes, gasket surface, thickness, etc.), and note the material class, temperature class, and testing methods.

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