Decommissioning Projects
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DNO NORTH SEA
Schooner
Field Type Location Water Depth (m) First Production Contact
Gas 44/26a 71 1996
Niall Anderson
UK Decommissioning procurement advisor
niall.anderson@dno.no
01224 650909
Project Summary
The Schooner SNS gas field is due to be decommissioned along with it's sister field, Ketch starting in September 2018. The project will take approximately 4 years to complete. The fields each have a normally unmanned platform on them, and an export pipeline taking produced gas to the nearby Murdoch platform, which is operated by ConocoPhillips. The Schooner platform has 11 wells drilled from it, and the Ketch has 9 wells. Ketch is in slightly shallower water at 54 metres, but the platforms are of identical design.

The abandonment effort will consist of plugging and abandoning all the platform wells plus one subsea completion (NW Schooner), cleaning and burying pipelines and the removal and disposal of both platform topsides (approx. 1,250 tonnes each) and jackets (approx. 2,000 tonnes each).

The Decommissioning Programmes for both platforms are with BEIS for review and the draft SCAP has been submitted to OGA and a follow up meeting held.

Gate review of well abandonment held in mid September and endorsement gained to advance into concept define.

Decision made to restrict size of Company PMT and to immediately tender for Well Management Company to support PMT and manage large areas of the work. SCAP to be updated accordingly.

Decision made to execute offshore scope sequentially utilising a single jack-up rig. Latest plan shows offshore start at Ketch in early Q4 2019, followed immediately by Schooner.

Discussions ongoing regarding potential reuse of redundant platforms after well abandonment as accommodation support to local wind farm developments.



Contracts Awarded

Title Contractor Name Contractor Primary Contact Date Awarded Contract Band Contact
Rig Hire EnscoRowan phil bellis 17-APR-2019 Large (>£25m)
phil.bellis@enscorowan.com
01224 786722
Well Abandonment Management Well Safe Solutions Phil Milton 05-JUN-2019 Medium (£10m-£25m)
phil.milton@wellsafesolutions.com
01224 548400


Challenges

Description Contact Name Telephone Number Email Address
BEIS has commented on the Project EIA that all pipeline mattresses where the concrete is bound by polypropylene rope have to be recovered and disposed of in an appropriate manner. This will add significant technical complexity to the Project and will have cost and schedule impacts. niall anderson 01224 650929 niall.anderson@faroe-petroleum.com
Continuing to examine potential "re use" options for platforms before committing to full removal. niall anderson 01224 650929 niall.anderson@dno.no
To evaluate potential cost benefit versus "manageability" of running 2 rigs in parallel as opposed to 1 executing work sequentially. niall anderson 01224 650929 niall.anderson@faroe-petroleum.com
Investigating removal of Ketch pipeline as opposed to burial. Taking account of commercial, ongoing liability and environmental considerations in arriving at "best solution" for Project. niall anderson 01224 650929 niall.anderson@dno.no
Potential deferment of tax benefit by reusing platform assets on "non oil and gas" basis. niall anderson 01224 650929 niall.anderson@faroe-petroleum.com
Defining best contracting "blend" of Company PMT, Rig Owner, Well Services Providers and Well Management Companies to provide cost and execution certainty. niall anderson 01224 650929 niall.anderson@faroe-petroleum.com
Last Updated: 01-JUL-2019 09:53:10


Every effort is made to ensure that the information given herein is accurate, but no legal responsibility is accepted for any efforts, omissions or is leading statements in that information caused by negligence or otherwise, and no responsibility is accepted in regard to the standing of any firms, companies, organisations or individuals mentioned.

For more information, please see the Decommissioning weblink.