‘Attic’ Oil Removed From Shell Bravo Concrete Storage

Deepocean recently completed the removal of “attic” oil from concrete storage cells at the foot of Shell’s Brent Bravo platform in 140 meters of water in the British North Sea with Enpro Subsea as a subcontractor.

An underwater construction ship from DeepOcean used the F-Decom system from Enpro Subsea to remove loft oil from concrete storage cells at the base of the platform.

“The system, which was deployed directly from the top of the platform in previous campaigns, was this time deployed from a DeepOcean construction ship, which resulted in a significant reduction in operating days per cell,” said DeepOcean.

Notably, the giant tops of the Shell Bravo platform have been removed from the giant Pioneer Spirit Ship in June 2019. The Brent Bravo platform consisted of a top supported by three reinforced concrete legs with a diameter of 12 meters.

“Only” a tried and tested system

According to Enpro, the F-Decom system is the only field-tested system for safe access to liquids in concrete cells with gravity-based structures (GBS), “which helps operators safely comply with their decommissioning regulations to protect the European marine environment”.

Enpro’s offshore engineers and onshore support teams were involved in the project, working alongside the DeepOcean operations and subsea teams on board the Maersk Forza construction ship.

Enpro Subsea’s solution is based on patented “anchor hub” technology that mechanically locks into the concrete cell cap and allows a range of tools (i.e. drilling, sampling, wireline, pumping) to be compact and lightweight, making them simple Installed and Operated Use working class ROVs and operate in a wide weather window.

This is the fourth such campaign the company has run for Shell to support its ongoing decommissioning program in the Brent field, northeast of the Shetland Islands.

Technical Director of Enpro Subsea Neil Rogerson On this: “The system has proven itself, and Shell has already used our F-Decom technology on the Brent Bravo and Brent Delta platforms. For the Bravo Project 2020, through our collaboration with DeepOcean, we have optimized the same low-risk system, especially for working from a ship, to achieve significant operational efficiency and add value to our customer. As a result, we have now expanded the track record of the only field-tested system that can be configured for various AOR (Attic Oil Recovery) decommissioning programs. “

Roy NilsenSaid DeepOcean project manager. “The attic oil recovery project on Shell’s Brent Bravo platform has been a great project for DeepOcean. Its success is based on the combination of the F-Decom system from Enpro Subsea with the expert functions of DeepOcean for underwater technology and WROV, as well as the good cooperation between all those involved. ”

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