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UH-2 Drill-Through Unihead System


The significant design innovation in the UH-2 Unihead system is the internal latch mechanism. The packoffs use an expanding latch ring to hold the casing hangers in place, replacing the need for lockdown screws. The latch ring and mating groove are designed to transfer casing load directly to the casing spool and conductor. The independent load shoulders allow greater weights of casing to be supported safely.

The UH-2 drill-through Unihead is a compact and unitized wellhead system that offers rig time savings, better well control, and safer operations for rig crews. This reliable and field proven system is installed as a single unit that allows drilling, running casing, cementing and installation of all the hangers and packoffs through BOP stack. This design minimizes BOP manipulation and saves significant rig time while improving safety. The UH-2 Unihead system can be used as an alternative to the UH-1 system and offers the following advantages:

- No lock-down screws

- Independent load shoulder for each casing string

- Improved rig safety and installation efficiency

- No need for personnel to work under suspended BOP stack

- Significant rig time savings due to through-bore Unihead design

- Hangers and packoffs are installed through BOP stack, saving rig time normally required to remove and reinstall the BOP stack during conventional wellhead installation

- No waiting on cement with mandrel casing hangers

- Split flange housing option for easy contingency operations

- Field proven and reliable design