SenTREE 7 Subsea Test Tree | Schlumberger

SenTREE 7

Completion subsea test tree

Provides large-bore well access, well control, and a reliable landing-string disconnect in an emergency

The SenTREE 7 completion subsea test tree is the primary subsea well control solution for completion, flow testing, intervention, and other subsea well operations performed from a floating vessel.

This field-proven modular system consists of

  • ball valve module
  • integral flapper valve and reentry profile
  • hydraulic latch module
  • bleedoff valve module
  • retainer valve, which can be configured to suit the BOP stack and other subsea interfaces.

Uses dual-barrier well control to prevent fluid spills

The SenTREE 7 test tree provides large-bore (7.375-in [187-mm]) well access, dual-barrier well control, and a reliable means to disconnect the completion landing string in the event of an emergency.

Two independently controlled barriers—a ball valve and a flapper valve—govern wellbore fluid flow at the subsea BOP. These valves are fail closed to secure the wellbore if hydraulic control pressure is lost.

If required, the ball valve assembly can be used to cut a variety of media, including slickline, wireline, and coiled tubing. The ball valve can cut 2.0-in-OD coiled tubing (0.156-in wall thickness, 95,000-psi yield) in an emergency. An optional module can be added for increased cutting capability, if required. The retainer valve provides environmental protection by holding hydrocarbons in the landing string after disconnect.

Adapts to varying operating conditions

Operating system options for the SenTREE 7 test tree support operations performed from anchored or dynamically positioned vessels in water depths ranging from shallow to ultradeepwater.

Multiple hydraulic and electrical ports allow customization of the SenTREE 7 test tree for

  • control of tubing hanger running tool
  • subsurface safety valve and completion
  • equipment devices
  • downhole chemical injection
  • line integrity monitoring during running or retrieving operations.
SenTREE 7 system diagram.
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