DECOMMISSIONING & ABANDONMENT
Enpro Subsea Enables Safe Removal of ‘Attic’ Oil From Brent Bravo’s Concrete Cells
Hunting Energy Services, Subsea Technologies division supporting DeepOcean has successfully completed another campaign in the North Sea using Enpro Subsea’s proven Field Decommissioning (F-Decom) system. The recent campaign on Shell UK Limited (Shell) Brent Bravo concrete structure was completed with no safety incidents, ahead of schedule and within budget.
Enpro’s patented technology enabled the safe access and removal of ‘attic’ oil from concrete storage cells at the base of the Brent Bravo platform in 140m water depth. The system, which on previous campaigns had been deployed direct from platform topsides, was this time deployed from a DeepOcean construction vessel, leading to a significant reduction in operating days per cell.
The F-Decom system is the only field proven system for securely accessing fluids within gravity-based structures (GBS) concrete cells assisting operators to safely meet their decommissioning regulatory obligations to protect Europe’s marine environment.
The project involved Enpro’s offshore engineers and onshore support teams working alongside DeepOcean’s operations and subsea teams onboard the construction vessel, the Maersk Forza. Enpro Subsea’s proprietary solution centres around their patented 'anchor hub' technology which mechanically locks into the concrete cell cap and allows a suite of tooling (i.e. drilling, sampling,
wireline, pumping) to be compact and lighter, thereby enabling it to be easily installed and operated using work class ROVs and operate within a broad weather window.
This is the fourth such campaign the company has undertaken for Shell to support its ongoing decommissioning programme in the Brent field, located north-east of the Shetland Islands.
Enpro Subsea Engineering Director Neil Rogerson said: “The system is well proven, and Shell have previously deployed our F-Decom technology on both their Brent Bravo and Brent Delta platforms. For the 2020 Bravo project, our collaboration with DeepOcean has allowed us to optimise
30
www.sosmagazine.biz November 2020
this same low risk system, specifically for working from a vessel, yielding significant operational efficiencies, and increasing value to our client. As a result, we now have extended the track record of the only field proven system, which can be configured to suit a variety AOR (Attic Oil Recovery) decommissioning programmes.”
Roy Nilsen, DeepOcean Project Manager said. “The attic oil recovery project on Shell’s Brent Bravo platform was a great project for DeepOcean and its success comes from the combination of Enpro Subsea’s F-Decom system and DeepOcean’s expert subsea engineering and WROV capabilities as well as the good collaboration between all parties involved.”
Enpro’s F-Decom tooling system deploying their ‘anchor hub’ onto a subsea cell top.
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52
