Oil & Gas UK Decommissioning Insight 2014
DECOMMISSIONING INSIGHT 2014
Subsea Infrastructure Decommissioning on the UK Continental Shelf
The years of high subsea infrastructure decommissioning activity in the CNS and NNS areas are from 2019 to 2022, while in the SNS and IS they are from 2016 to 2020. The decommissioning of mattresses and removal of other subsea infrastructure typically occur in the same year (see figure 17 and 18). Mattresses are usually removed from the seabed at decommissioning although they can be decommissioned in situ if badly degraded and approval has been obtained from the Department of Energy & Climate Change (DECC). Other subsea infrastructure includes manifolds, christmas trees, risers, spools, jumpers, anchors and subsea isolation valves (SSIVs). Pipelines are discussed in section 6.4. Due to the inclusion of additional subsea projects in the CNS and NNS areas in the 2014 survey, the number of mattresses and weight of subsea infrastructure have more than trebled the forecast in the 2013 report. Figure 17: Forecast of Mattress and other Subsea Infrastructure Decommissioning in the Central and Northern North Sea from 2014 to 2023
30,000
1,200
Increased Uncertainty in Forecasts
25,000
1,000
Increased Uncertainty in Forecasts
20,000
800
15,000
600
Removed
400
10,000
Number of Mattresses
200
5,000
Tonnage of Subsea Infrastructure to be
0
0
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Source: Oil & Gas UK
Number/Weight 2014 to 2023
Total Expenditure 2014 to 2023
Mattresses and subsea infrastructure
-
£330 million
Mattresses
2,800
- -
Subsea infrastructure
54,100 tonnes
32
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