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Enhanced Horizontal Subsea Tree (EHXT)


Horizontal trees are known for their installation efficiency, being workover friendly, and offering easy access for tubing retrieval due to the horizontal positioning of the primary valves. FMC Technologies is a market leader in horizontal tree technology and has successfully installed more than 1,000 worldwide.  

The Enhanced Horizontal Christmas Tree (EHXT), introduced in 2002, offers an elongated tubing hanger incorporating two wireline plug profiles. This enhanced hanger along with the elimination of the internal tree cap removes the problem of trapped debris resulting in a cost effective and reliable tree solution. The tree has a modular design that allows easy manufacturability and offers flexibility for low to high functionality in accordance with operator requirements.

The broad product portfolio provides solutions for deepwater, shallow water, and template applications and is rated for up to 10,000 feet water depth. EHXTs are capable of operating at pressures up to 10,000 psi and 15,000 psi. In addition, the EHXT is available in the field proven large bore design and is configurable for gas lift operations and downhole ESP completions.

EHXT Advantages:

  • Traditional pressure containing internal tree cap has been eliminated, and the pressure barriers moved to an elongated tubing hanger resulting in more cost effective and reliable completions.
  • Well control and vertical access to downhole equipment are gained through a conventional marine drilling riser and subsea BOP eliminating the need for costly and specialized completion risers.
  • Large bore configuration allows installation and retrieval of downhole equipment without disturbing the tree or external connections to flowlines, service lines, or control umbilicals.
  • The tubing hanger is landed within the tree body making it possible to recover the completion without removal of the tree.
  • Patented and field proven solution for incorporation of downhole ESP penetrator.
  • Common tooling package across 10,000 psi and 15,000 psi EHXT systems improves availability and significantly reduces hardware costs and lead time on projects.