Subsea Test Tree Components

Subsea Test Tree Components

Seahorse Energy® has collaboratively worked with PRT Offshore on the design and development of various subsea test tree components. Through PRT’s field experience and input, specifications were developed. And, throughout the engineering process, these specifications were refined and enhanced. This has resulted in leading-edge equipment with unequaled system functionality.

Latch

The latch is a disconnect mechanism within a subsea test tree system. It is the latch that enables a safe disconnect and reconnect for both the landing string and the control lines if the subsea test tree is parted at the shear joint.

Circulation Sleeve

The purpose of the circulation sleeve is to selectively allow the flow of fluids between the bore and the annulus of a subsea test tree. When the subsea test tree is being deployed, the circulation sleeve provides a high-pressure 15,000 psi barrier. When desired, the circulation sleeve is “opened” which allows fluid to be circulated between the bore and the annulus through a large diameter. Because of the innovative design, the sleeve can be opened under full 15,000 psi pressure differential.

Vent Sleeve

Similar to the circulation sleeve, the purpose of the vent sleeve is to selectively allow the pressure to vent between the bore and the annulus of a subsea test tree.

Jumpers

Jumpers

Jumper End Kits

There was a need for a new subsea tieback into the Troika manifold using a unique subsea connection system.  This connector utilizes a multi-bore horizontal connection system.  The main elements to the system are 2 hubs, a connector and the special running tool.  The connector is made up of a clamp and a seal plate.  The purpose of the running tool is to pull the 2 hubs together, “sandwiching” the seal plate and clamp between them.  Then, the running tool is used to torque the 2 drive screws on the clamp, which preloads the system.  Seahorse Energy® worked with the operator to utilize existing customer property where possible (to reduce costs) and engineer, manufacture and test new equipment where needed in order to deliver a new jumper end kit for the subsea tieback.

Refurbishment

Refurbishment

Debris / Pressure Cap and Connector Refurbishment

As jumpers are pulled from the old fields, new debris / pressure caps and connectors are needed.  The operator can have this equipment in their customer property, but they oftentimes are not well maintained.  Seahorse Energy® has the capability and expertise to refurbish this equipment to “like new” service.  Seahorse will disassemble, inspect the parts, design and/or order new parts where required, coat the components, and reassemble and test in a matter of weeks.

Subsea Debris/Pressure Cap

Subsea Connector

Specialty Tooling & Intervention Equipment

Specialty Tooling and Intervention Equipment

Subsea Dispersant System

In the event of a deepwater blowout multiple problems must be assessed and solved in a short period of time.  One important effort is to inject dispersant fluid at the source of the leak.  Seahorse Energy® was contracted to design, manufacture and deliver 1,500’ long hose dispersant systems.  In the event of a blowout, a hose skid is set on the seabed such that the dispersant fluid vessel can be kept at a safe distance.  ROV’s are used to connect the dispersant hose to a coiled tubing manifold hung from the vessel.  ROV’s are then used to deploy the dispersant hose from the “figure 8” skid to the leak where dispersant fluid can be injected.

Vertical Hydraulic Stab Tool

On the Yukon project, there was a desire to unlock the tubing head with the tree still installed (vertical tree system with the tree installed on a tubing head). The original design of the tubing head requires a guidebase-type running tool to interface with a vertical hydraulic mandrel in the “corner” of the tubing head frame. With the tree in place, this was not possible with the existing running tool. Seahorse designed a short, light-weight ROV tool that could be flown onto the vertical mandrel, locked in place, and able to mechanically establish communication with the hydraulic controls. The Vertical Hydraulic Stab Tool was designed, manufactured and delivered in 9 weeks.

ROV Panels

ROV panels are a critical aspect of any intervention.  They are the interface between the subsea equipment and the ROV, providing a means of functioning valves, pressure testing, establishing hydraulic access, and more.  Seahorse Energy® designs, manufactures, plumbs and tests all of the ROV panels for our intervention equipment.

Storage and Maintenance

Storage and Maintenance

Seahorse Energy® Shop

Shop Capabilities

Subsea Connectors and Sealing Systems

Subsea Connectors, Caps and Sealing Systems

Knock-On Cap

After removing a subsea tree from its manifold, protection is needed for the manifold piping, valves and seal surfaces for long-term preservation.  Seahorse Energy® engineered, manufactured and tested a new pressure cap (Knock-On Cap) to meet these needs – and this was done in 11 weeks.  The pressure rating was 5,000 psi for each passageway in the multi-bore hub, and the nominal connector size was 18”.  The resulting pressure end loads were over 400,000 pounds.  Because of this, it was critical for the design to be efficient and light weight.  The Knock-On Cap is a great example of the connector expertise that exists at Seahorse Energy®.

Pompano Subsea Connection System Connector

The Pompano project uses a unique subsea connection with a multi-bore horizontal connection system.  The main elements to the system are 2 hubs, a connector and the special running tool.  The connector is made up of a clamp and a seal plate.  The purpose of the running tool is to pull the 2 hubs together, “sandwiching” the seal plate and clamp between them.  Then, the running tool is used to torque the 2 drive screws on the clamp, which preloads the system.  For this project, a new connector was needed(seal plate and clamp).  Seahorse Energy® engineered, manufactured and tested a new connector for the Pompano subsea tieback.

SEI V-Seal System

New seals were needed for the seal  plate associated with the Troika Jumper end kit (see associated project description).  These included V-seals (metal-to-metal and elastomer) as well as a production bore seal.  Seahorse Energy® engineered, manufactured and tested new seals to function in the existing customer property geometry.  Because of extensive sealing experience, Seahorse has successfully developed these new seals in a fraction of the time of a traditional new seal delivery (weeks vs. months).

Previous Next
Close
Test Caption
Test Description goes like this