Plug and Abandonment Forum (PAF) Norsk olje og gass. Oljebransjens Bore & Riggkonferanse - BOR / Steinar Strøm - PDF

Plug and Abandonment Forum (PAF) Norsk olje og gass Oljebransjens Bore & Riggkonferanse - BOR / Steinar Strøm The Plug and Abandonment Forum PAF 2009: 9 members (initiative by ConocoPhillips)

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Plug and Abandonment Forum (PAF) Norsk olje og gass Oljebransjens Bore & Riggkonferanse - BOR / Steinar Strøm The Plug and Abandonment Forum PAF 2009: 9 members (initiative by ConocoPhillips) 2016: 15 members + 2 observers Members: BG Group Norge, BP, Centrica, ConocoPhillips, Det norske, Eni, ExxonMobil, ENGIE, Hess, Norske Shell, Petoro, Statoil, Repsol, Total, Wintershall Observers: PSA and UiS Goals Increase understanding for P&A Develop common understanding of regulations (work with PSA) Exchange experiences Raise the industry awareness for P&A Encourage P&A technology development Incorporate academia into our P&A world (education/recruiting) 2 3 Classification: Internal Plug and Abandonment in Statoil Background Focus areas Status Background Huge amount of Permanent P&A activities ahead of us Efforts to reduce time and cost in P&A Rigs per 5 year period on PP&A Average PP&A activities ahead of us: : On average 1 rig/yr Increasing trend until the top in , where 5-6 rigs will be occupied with P&A operations Improvement effort needs to address the major «time thieves» Casing, trip and milling 80% of time Focus areas for P&A improvement Minimize retrieval of old tubulars Minimize tripping Taking existing methods and technology into daily use Contribute to development of new game changing technology External orientation and exp. transfer Look for the best/most effective solutions Connect with authorities and technology providers to understand experience and verification requirements Ongoing programs and studies Program: P&A Qualification Program 1 Project: Evaluation of flow potential in overburden zones 1 Note: Many decisions are made based on lack of hard facts 7 Technology status Degree of change Cost reducing technologies P&A Improvement - Road map High Level 1 «Improvement» P&A Best practice by end of 2015 Level 2 «Technical Limit» P&A STEP improvement ambition - to be implemented in 2016 Ex: Huldra Level 3 «Game changing» P&A Disruptive technologies- to be implemented in 3-5 years Ex: Plasma steel removal Ex: Glitne Low (?) Year of implementation Lean P&A Team Drive culture for lean and safe P&A in Statoil Influence concept selection early to ensure cost efficient solutions. Implement Statoil s best practice Experience transfer Implement more efficient P&A technologies and methods. Enable more use of intervention methods for cost efficient P&A s Lean P&A Team Team Lead Initial PP&A/SR concept Planning support Multi skilled professional team Lean PP&A/SR concept Other Stakeholders (Internal/external) TECHNOLOGY INTRODUCTION Barrier risk assessment model Field and well specific data Flow model Risk assessment 6 each case studies are carried out Barrier length requirement Tubing as a work string to place cement Current experience Alternative to dress off and tag when setting 2 barriers inside casing Used on Heimdal PP&A campaign (several wells) The same method was also used on Statfjord Øst (2 subsea wells) 11 Alternative to logging as verification Cases in need of an alternative to logging: Execution Any well with a long moderate ( poor) log response PWC when big hole charges interferes with log interpretation Two annuli verification independent of barrier placement technique ( including PWC) Heterogeneity in creeping formation may be applicable Apply pressure above plug Monitor below plug (surface or real time read out) Water based fluid (preferred: seawater) 12 Field case: Solution based on thorough subsurface studies Traditional thinking Static conditions Dynamic condidtions Overburden evaluation Selected solution Final reservoir pressure simulation 13 PLUG AND ABANDONMENT Move activities from rig to vessel Ongoing activities Campaign to remove 13 well heads by use of vessel (Island Vanguard) with abrasive cutting Investigating to use existing methods from a vessel, examples are: Bullheading of cement Use tubing as work string to place cement (re. Heimdal/SFØ) Most likely a riser less solution is required Potential for joint effort with Decom project groups, particularly relevant for subsea decommissioning PLUG AND ABANDONMENT Summing up We are on the right track! Questions? Classification: Internal
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