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Rigless P&A of Subsea wells in Norwegian and Danish Waters - 2009-2014
Decom North Sea Lunch and Learn
November 12th 2014
Øystein Kanestrøm
2010 – Wellhead removal & X-mas tree recovery
• Client: Det norske, Premier,
Nexen
• Scope: 5 wellhead removals,
X-mas trees recovery (for
resuse), survey
2011 – Wellhead removal & CAN recovery
• Client: Det norske, Petro Canada (Suncor), Premier,
• Scope: 7 wellhead removals, cement flushing, survey, and 1 spud CAN
2012 – Wellhead removal & CAN recovery
• Client: Det norske, Statoil, Total,
Noreco, Centrica
• Scope: 5 wellheads, hydrate
washing, fishing of WF cutting
tool, recovery of dropped
drillpipe, CAN recovery and
survey, rescue fishing vessel
• Offshore campaign divided in 4
Phases– Phase 1 – Access to wells
– Phase 2 – Remove TA caps and
Top up cement
– Phase 3 – Cut wells below seabed,
– Phase 4 - Clear seabed and final
survey
• 9 wells finally abandoned in 2013
• survey of 4 wells for 2014 scope
(15 wells planned for 2014)
Island Valiant Pipe Handling System
2013 – Mærsk Oil and Gas P&A of Suspended Subsea wells
• Offshore campaign divided in 5
Phases– Phase 1 – Access to wells
– Phase 2 – Remove TA caps /
Wireline operations / scraping
– Phase 3 – Cut and recover casing
– Phase 4 - Cementing
– Phase 5 - Cut and recover wells and
clear seabed (2015)
• 14 wells
2014 – Mærsk Oil and Gas P&A of Suspended Subsea wells
Phase 1
Access the wells
Phase 2
TA caps / scraping
Phase 3
Cut and pull casing Phase 4
Cementing
Phase 5
WH cut and recovery
2014 – Phase 1- Access to wells
Flushing 500m^3 /min@8 bars - vessel ballast
pumps
Jetting 5-8m^3/min@300-500 bars - cement pumps
Jetting 1m^3/min@1000 bars HP pumps
Downhole video cameras
Various type of flushing heads and jetting nozzles
2014 – Phase 2 - TA caps recovery and wireline operations
Wireline operations:
- Lubricator
- Slickline jar (prong
recovery)
- CBL and CCL
logging
- Bridge plug setting
• Pump and pull - hose and cement stinger
• Flush back to 35ft BML
• Weight test
• Batchwork
2014 – Phase 4 - Cementing the wells
For more information, please visit:
www.oceaneering.no
All space related photos are courtesy of NASA
Thank You for Your Attention!
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