Rigless P&A of Subsea wells in Norwegian and Danish Waters - 2009-2014

Decom North Sea Lunch and Learn

November 12th 2014

Øystein Kanestrøm

2

Oceaneering

HSE

3

Oceaneering Safety

4

Oceaneering Safety

5

Oceaneering Life of Field

2009 – The year it started

• Client: Det norske

• Scope: Wellhead removal and survey

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

2014 – Rig Chase

• Client: Det norske /GDF Suez,

Statoil, Total, Talisman

• Scope: 6 wellheads,

• 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

2014 – Phase 3 - Casing, scraping, cutting and recovery

Scraping the wells

• Pump and pull - hose and cement stinger

• Flush back to 35ft BML

• Weight test

• Batchwork

2014 – Phase 4 - Cementing the wells

Client reference list

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Oceaneering – Well abandonments

For more information, please visit:

www.oceaneering.no

All space related photos are courtesy of NASA

Thank You for Your Attention!