Excellence in Engineering & Project Management Services

Tristan 11

Client: Frazer Drilling Services/Bridge Energy

CONSUB supported Frazer Drilling Services on the subsea engineering planning and procedures and offshore supervision of work for the successful recovery of the subsea tree.

Background

Frazer Drilling Services was contracted by Bridge Energy to manage the jack up rig operations during the well abandonment and recovery of the tree. CONSUB supported Frazer Drilling Services on the subsea engineering planning and procedures and offshore supervision of work for the recovery of the subsea tree.

The water depth was 20 m, and visibility was very poor due to currents running at 2 knots and sediment disturbance from the ROV thrusters.

The recovery was executed using a combination of ROVs and diver intervention.

Scope

We were contracted to provide subsea engineering expertise for planning the operation, which included performing an EFAT/SIT on a similar subsea tree which had been procured but not installed and was available in storage at a yard in Aberdeen.

Our personnel attended on the rig and oversaw the offshore operations interfacing with the WROV crew and the dive team as appropriate.

Recovery was successful despite weather related delays and visibility difficulties.

Other Projects

Our Offering

CONSUB is a leading provider of engineering and project management services to the renewables sector. We offer a comprehensive range of services throughout all stages of a development, from supporting developers in the early stages of a project, to providing long-term operational support.

CWP AMAN P2X

CONSUB developed a proprietary model using the Python programming language to screen various options for a P2X system to produce green hydrogen and liquid ammonia.

Offshore Green Hydrogen

CONSUB undertook a study on how to achieve the UK Government’s ambition to install 5 GW of electrolytic (green) hydrogen production capacity by 2030.