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Importance of Effective Sand Management - DTI View

Importance of Effective Sand Management - DTI View. Colin Cranfield Reservoir Engineer Licensing & Consents Unit, Aberdeen. Outline. • UKCS context – Production targets • General observations – Environmental aspects • DTI initiatives – Mature fields – Production efficiency

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Importance of Effective Sand Management - DTI View

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  1. Importance of Effective Sand Management - DTI View Colin Cranfield Reservoir Engineer Licensing & Consents Unit, Aberdeen

  2. Outline • UKCS context – Production targets • General observations – Environmental aspects • DTI initiatives – Mature fields – Production efficiency • Conclusions slide no. 2

  3. Structure of DTI’s Energy Group Nuclear and Coal Liabilities Unit Energy Strategy Unit British Energy Director General Energy Markets Unit Energy Innovation and Business Unit Licensing and Consents Unit slide no. 3

  4. LCU – organisation & objectives • Field development – London- & Aberdeen-based field teams – Plus: consents & measurement • Environmental – Aberdeen-based teams – Environmental management & inspection • Aims – Maximise UKCS economic recovery – Minimise environmental impact slide no. 4

  5. DTI / PILOT - vision & challenges • PILOT targets for 2005 & 2010 slide no. 5

  6. UKCS production forecast (MM boe/d) Total UKCS Oil and Gas Production from discovered reserves (million boe/day) 5 4 3 2 Possible new developments Probable new developments - upside Probable new developments Brown field growth Producing fields Proven + Probable PILOT targets 1 0 2003 2004 2005 2006 2007 2008 2009 2010 slide no. 6

  7. Shrinking window of opportunity 2002 2014 2020 slide no. 7

  8. DTI / PILOT - vision & challenges • PILOT targets for 2005 & 2010 • Production increments needed from – Brown fields – New developments – Exploration success slide no. 8

  9. Sand – effect on production / facilities • Monitoring and controlling sand – Typically choke wells back • Fluctuating separator performance – Less residence time – Liquid carry-over • Sand clean-out – Online preferable – Offline • Requires human intervention • Shut-downs to clean out separators • Replacement of worn items • Lowered production efficiency slide no. 9

  10. Sand – effect on flow measurement • Liquids carry-over from separator – Affects ability to meter accurately GAS • Orifice plates – Significant under-estimation possible – 0.3% error represents loss of one day’s production p.a. – Ultra-sonic meter tubes • Change in surface roughness can cause inaccuracies OIL • Turbine meters – More frequent meter proving slide no. 10

  11. Sand – typical operator approaches • Focus on down-hole issues – Optimising well completion strategies – Well location • Less focus on sand issues at surface • Best practice - totally integrated – Sand prediction, monitoring and control – Well sanding limits – Defined and optimised procedures – Down-hole sand control within overall strategy slide no. 11

  12. Environmental considerations • Sand disposal – Volumes – Increased weight • Legislation – Hydrocarbon contamination • Water-washing required – Exemption required for discharge to sea – Dealt with by DTI environmental inspectors • Erosion – Increased corrosion rates – Potential for loss of integrity • Hydrocarbon discharge slide no. 12

  13. DTI initiatives / support NEW DEVELOPMENTS & EXPLORATION • Fallow blocks / Fallow discoveries • Shortened licence terms for new licences • Access to infrastructure • “Promote” licences slide no. 13

  14. DTI initiatives / industry support NEW DEVELOPMENTS & EXPLORATION • Fallow blocks / Fallow discoveries • Shortened licence terms for new licences • Access to infrastructure • “Promote” licences MATURE FIELDS • Brown field work group – Bench-marking study • DTI action on production efficiency slide no. 14

  15. Production efficiency - overview DRIVERS • Maximise Brown field potential • Mature infrastructure • Security of (gas) supply • Environmental & safety considerations PROCESS • Consultation process completed 1Q 2003 • Establish base line / agree definitions • Formulate plan of action slide no. 15

  16. Size of production efficiency prize (according to Brown field work group) slide no. 16

  17. Intervention tool box • Compression • Corrosion • High water-cut • Liquid hold-up • Slugging • Sand control • Set points, valves & controls • Weir heights • Power generation • Water injection slide no. 17

  18. Conclusions • Sand management is important • Integrated approach is needed – Focus on overall system • Sub-surface and topsides – Consider overall cost / benefits • Collaborate / share best practices • More effective sand management will – Add value / lower costs / raise efficiencies – Help meet PILOT targets slide no. 18

  19. Further information / contacts www.og.dti.gov.uk Field development • colin.cranfield@dti.gsi.gov.uk Measurement • douglas.griffin@dti.gsi.gov.uk Production efficiency • ragbir.chana@dti.gsi.gov.uk Environmental • offshore.inspectorate@dti.gsi.gov.uk slide no. 19

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