Plug & Abandonment Forum (PAF) P&A in the past, present & in the future PAF Seminar 29 October 2015 Martin Straume, chairman PAF Lead P&A engineer, BP Norge
Plug & Abandonment Forum (PAF)
P&A in the past, present & in the futurePAF Seminar 29 October 2015
Martin Straume, chairman PAFLead P&A engineer, BP Norge
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Topics
1. P&A in the past
2. P&A at the present
3. P&A in the future – PAF
4. Future technology - P&A roadmap
5. Summary
P&A in the pastBest field P&A in Norway
• P&A Frigg with average of 5,3 days/well
• Wells P&A-ed with Mærsk Innovatorduring 2003 (1st campaign) and 2005
(2nd campaign)
• Drilling of these wells finished in 1979
• Wells designed with cemented casing fromcasing shoe to inside previous casing shoe
• Much of the P&A work was to set internalcement plugs
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P&A at the presentWell design changed at some point at NCS
• Directional wells, Longer wells, HPHT wells
• Primary cementing from casing shoe to 200mabove the casing shoe
• Open annulus from TOC and into previouscasing shoe
• New overburden knowledge may dictatebarriers where no cement is
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Knowing our overburden
• Today, we have better technology and tools to map the overburden sealscompared to the past
• Therefore - well design today could include annulus barriers in new wells where seals need to be at the time of P&A – some time in the future
• Some North Sea fields have swelling shales which seal after being drilledthrough. If they swell, or can be promoted to swell, new well design could plan for shale barrier at P&A time. Cap rock……………..
• Include P&A barrier schematics in drilling program
• Aim for P&A to become installation of internal barriers
• Think ”Cradle - to – Grave” when constructing new wells
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• With external casing barriers in place,……
• Wireline and coiled tubing can log,
set bridge plugs, set cement plugs, etc..
• Possible to cement A-annulus through tubing
• If we only could log 2 strings….…missing link
• Could delay rig P&A to the 13 3/8” shoe
• Rigless P&A has well control equipm. in place
• Rigless P&A gives flexibility in timing for P&A
P&A in the futureRigless P&A ?
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Plug & Abandonment – Technology
• Conventional P&A – yes• What’s new?• Shale Barriers• Perf – Wash – Cement technology
Roadmap for New P&A Technologies
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Optimize Perf Wash & Cement
Optimize Milling
Rigless P&A- High Capacity CT System- High Energy Solutions
(Melt/Burn)/Extreme Concept
Alternatives to cement- Creeping shale / Formation
effects- Sand/Rock/Natural
materials- Chemical materials- Steel
Improved Verification / Logging methods
Wireless technology(subsea wellheads)
Tubing left in hole
Ctrl line left in hole
Dual string: Cement bond logging Perf, Wash & Cement, Milling
Well Intervention technologyfor P&A
Tender Support P&A rigs/Modular Rigs
LIV CT Pilothole drilling/cementing
Rig/Process optimization
Drill Pipe Coil Tubing Through Tubing Wireline Rigless
2015 2016 2017 2018
Focus areas for 2015 - 2016 Futuristic Technologies
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Summary
1. Cradle to Grave well design. Design new wells to let P&A become internal barriers the next 40 yrs.
2. Make use of mother earth if possible (shale swelling). Best long term testedbarrier ever.
3. Key missing technology is logging through 2 strings.Verification of external barriers.
4. Potential to leave tubing in the hole.
5. More scope to rigless P&A could enable more flexibility around when rig P&A takes place.
6. Rigless P&A through X-mas tree keeps well control equipment in place.
7. P&A needs new technology to place quality barriers at reduced time and cost. Win – win for the industry and the nation.