Tubing Head Spools & Adapters
Tubing head spools and adapters are the interface components that connect the individual elements of the wellhead stack — casing heads, tubing heads, and Christmas trees. They ensure pressure-rated, leak-free connections between components of different sizes, pressure ratings, or bore configurations. Selecting the correct spool or adapter is essential for wellhead stack integrity.
What Tubing Head Spools and Adapters Do
In a multi-string wellhead, each casing string lands on a separate spool or head. Spools provide the annular outlets, hanger landing profiles, and connection flanges between successive casing strings. Adapters bridge differences in flange size or pressure rating between adjacent wellhead components — for example, connecting a 3 000 PSI tubing head to a 5 000 PSI Christmas tree.
Getting the spool and adapter specification wrong causes flange mismatches, pressure rating inconsistencies, and wellhead stack integrity issues that are costly to correct after installation.
Product Range
Tubing Head Spools
Tubing head spools provide the landing and sealing point for the tubing hanger. They include side outlets for annulus access and a top flange for the Christmas tree or adapter. Available in 7 1/16″ flange with 3M and 5M pressure ratings, and bottom connections to suit the casing head or casing spool below.
Casing Spools
Casing spools land between successive casing strings in multi-string wells. They provide the hanger for the next casing string, seal the annulus between strings, and carry side outlets for annulus monitoring or intervention. Available in sizes to match all standard casing programmes.
Tubing Head Adapters
Tubing head adapters (THA) connect the tubing head to the Christmas tree, bridging differences in flange size, bore, or pressure rating. WNS Lowery L-W2W Profile Tubing Head is available with Slip Flange (max 3M), B1 Adapter Flange, and B2 Adapter Flange configurations.
Adapter Flanges
Adapter flanges connect wellhead components with different API flange sizes. All WNS Lowery API flanges are 100% American-made at their Oklahoma City facility.
Key Specifications
| Parameter | Details |
|---|---|
| — | — |
| Flange sizes | 7 1/16″ standard; other sizes on request |
| Pressure ratings | 1 500, 2 000, 3 000, 5 000 PSI |
| Bottom connection | Threaded or slip-on to match casing head |
| Side outlets | 2″ NPT standard |
| Material | High-strength forged carbon steel |
| Standard | API 6A |
Suppliers
| Supplier | Products | Notes |
|---|---|---|
| — | — | — |
| Wellhead Systems Inc. (via Power Flow) | Tubing head spools, casing spools, adapters | API 6A, matched to WSI wellhead systems |
| WNS Lowery (Marsh Bellofram Group) | L-W2W tubing head, adapter flanges | American-made, multiple flange configurations |
Why Source Through Proxima
Proxima supplies tubing head spools and adapters as part of a complete wellhead stack — ensuring dimensional and pressure rating compatibility across all components. We review your casing programme and wellhead configuration before supply to eliminate mismatch errors.
Frequently Asked Questions
Q: How do I specify the correct tubing head spool for my well?
Specify the casing size and weight below the spool, the tubing size above, the required pressure rating, and the Christmas tree flange size. Proxima engineers confirm the correct spool configuration from your wellhead programme.
Q: Can Proxima supply spools to match an existing wellhead from another manufacturer?
In many cases, yes. Provide the existing wellhead make, flange size, and pressure rating, and we will specify a compatible spool. Bore and flange compatibility are confirmed before supply.
Q: What is the lead time for tubing head spools?
Standard configurations are typically available within 8–12 weeks ex-works. Contact Proxima for current availability and lead times for your specific configuration.
