Brent Field Wells
A significant proportion of decommissioning cost is incurred plugging and making safe the wells. This is one of the most significant areas of activity for any decommissioning project, and industry data suggests this typically accounts for 40% or more of all expenditure. Work on the Brent wells has been underway since 2006.
There are 154 wells across the four platforms – some are 40 years old – and hundreds of wellbores across the field. Every well has to be sealed with cement barriers after the casings and well control equipment have been removed. This is done to ensure that the wells are isolated with appropriate seals to ensure no hydrocarbons are released.
At the end of June 2014, our six-year plug and make safe campaign on Brent Delta was successfully completed. All 40 wells on the platform were sealed with impermeable layers and final monitoring was set up. The platform was declared reservoir hydrocarbon free after it was disconnected from the oil and gas export lines.
The decommissioning of all wells on Delta was completed by the end of 2014. We are now able to apply this knowledge to Bravo, Alpha and Charlie to make this process more efficient.
Did you know?
- Most people understand that Brent was named after the Brent goose, which is correct however the initials BRENT cover the Jurassic age Brent group that make up the field: Broom, Rannoch, Etive, Ness and Tarbert formations.
- 187 miles of steel tubes have been retrieved so far from the field – this would be enough to travel from Aberdeen to Berwick Upon Tweed by road.
- On Brent Delta alone, 105 miles of steel tubes have been retrieved – this is enough to cover the driving distance from Aberdeen to Inverness.
- During the process of plugging and making safe a well, tools may be deployed on a type of wire or cable. Over 1,500 miles of wireline has been unspooled and re-spooled during operations so far, enough to travel from Aberdeen to Barcelona by road.
Decommissioning the Brent Wells