On previous campaigns, the Enpro Subsea field decommissioning (F-Decom) system had been deployed direct from platform topsides. But this time it was deployed from a DeepOcean construction vessel, leading to a significant reduction in operating days per cell.
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 said that its proprietary solution centres around patented 'anchor hub' technology that mechanically locks into the concrete cell cap and allows a suite of tooling (that is, 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.