Subsea intervention

Aker Solutions’ can offer one of the world’s most efficient subsea intervention solutions through its vessel Skandi Santos.
The subsea intervention system is qualified for use at 3 000 metres water depth.

The subsea intervention system is specially designed for quick installation and retrieval of subsea trees by using a fibre rope

The subsea intervention system is specially designed for quick installation and retrieval of subsea trees by using a fibre rope. It s also capable of running full functional testing and commissioning of the subsea equipment once it is installed. The subsea intervention system is qualified for use at 3 000 metres water depth.

The SOES
At the heart of the subsea intervention system is the SOES – a subsea orientation equipment system. The main benefit of the SOES is increased efficiency for installation and subsea testing of wellhead modules such as subsea tree, adapter base and subsea tree cap.
 
The purpose of the SOES can be listed as:

  • Assisting by maneuvering the subsea stack when installing
  • Subsea function test of tree and downhole functions
  • Subsea pressure tests with N2 and fluids
  • Testing and communicating with subsea tree and downhole sensors
  • Subsea MEG filling
     

The SOES consists of a topside control system with interface to the vessels ROV system, main frame with ROV docking porch and thrusters, subsea control system with subsea HPU, centre spool with interface to the vessels cursor system and subsea equipment, and an ROV skid.

The SOES is deployed on a fibre rope and receives its power (electrical and hydraulic) and control signals via a control ROV, which is docked to the SOES when at operational depth. This ROV is deployed separately and is linked to the surface by an umbilical cable that carries the power and signals needed to control both the ROV and the SOES. A second ROV is also in attendance as an observer, and can substitute for the control ROV. Together they will perform the installation task.

The SOES is equipped with four thrusters placed in the lower corners of the frame. The thrusters will be used to do the final orientation and rotation of the stack when installing. The SOES is normally using information from the ROV positioning system to navigate to the wellhead, but is also equipped with a gyro. Functions such as auto positioning and heading are also available. 

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