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GE Oil and Gas introduced the Vetcogray DHXT deepwater horizontal tree and integral control system at the 2010 Offshore Technology Conference (OTC).

The DHXT operates in water depths up to 10,000ft (3,048m) and at pressures up to 15,000psi.

The streamlined design reduces standard industry horizontal tree footprint by 12 per cent (to 4.5 x 4.4m) and weight by 10 per cent (to 43.7 tonnes), delivering significant installation, maintenance and cost benefits for operators.

The D-Series package includes the integral Vetcogray Modpod, a subsea control module that is powered by Semstar5, representing a new generation of ultra-reliable, open-architecture subsea control and instrumentation systems.

The DHXT horizontal tree is a flexible solution and design-engineered as the result of continuous consultation and input from both major and independent oil companies.

This approach delivers improved functionality and flexibility by incorporating common project requirements to meet a range of customer standards.

The new Vetcogray DHXT has three primary configurations.

DHXT-SP is a standard production tree designed for lowest installed cost and reliability.

A modular concept is used for all major components of the tree.

This system delivers full deepwater capabilities in a compact, lightweight and flexible package.

DHXT-EP is an enhanced production tree system offering additional functionality.

The annulus wing block is extended to include additional valves and sensors for improved annulus pressure management.

DHXT-GP is a gas lift production tree system offering further functionality.

Additions to the standard system include a gas lift choke, dual-bore flow-line connector and sensors.

The new D-Series package includes the integral Vetcogray Modpod, powered by the Vetcogray Semstar5, a fifth-generation subsea electronics module.

Statoil will deploy it next year in the Tordis Vigdis Controls Modification (TVCM) project in the North Sea, off Norway.

Featuring a modular design approach, Semstar5 offers new levels of open-architecture IP-enabled communication capabilities and infrastructure to support the higher bandwidth requirements of modern instrumentation, while also offering high reliability.

The new DHXT and subsea system can be monitored remotely from GE’s new Smartcenter (Subsea Monitoring and Remote Technology Center), a remote-access data hub connected to subsea field control and instrumentation facilities around the world.

Officially opened in October 2009, the Smartcenter facility offers assistance and services to the field at every stage of development – from installation and commissioning, through field start up and onwards into routine operation for operational support, condition monitoring, diagnostics and production optimisation.

The DHXT deepwater tree with integral control system also features the option for a Semstar5-R, which is a freestanding subsea data hub package designed for installation on subsea trees, manifolds and process facilities.

The unit is deployed and retrieved by ROV, with connections to the subsea control and instrumentation system made with wet-mateable ROV-deployed jumpers – using either electrical or fibre-optic connections.

The external package is fully marinised for long-term subsea immersion and the internal data-hub multiplexing unit is an application-specific configuration of the innovative Vetcogray Semstar5 subsea electronics module.

GE will display its extensive and integrated subsea portfolio of solutions at OTC, including trees, controls, manifolds, connection systems, subsea power and processing.

All of these systems are designed to provide competitive lead times, benchmark reliability and lowest installed cost.

GE Oil and Gas

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