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DTI Perspective on Reservoir Surveillance

Colin Cranfield Reservoir Engineer Licensing and Consents Unit Aberdeen. DTI Perspective on Reservoir Surveillance. 15 September 2004. Quote from the late Laurie Dake*

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DTI Perspective on Reservoir Surveillance

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  1. Colin Cranfield Reservoir Engineer Licensing and Consents Unit Aberdeen DTI Perspective on Reservoir Surveillance 15 September 2004

  2. Quote from the late Laurie Dake* Thorough data acquisition is expensive (very expensive) and it is the duty of practising reservoir engineers to convince those who hold the purse strings of the necessity of the exercise. * “The Practice of Reservoir Engineering”

  3. Overview • DTI-LCU remit • PILOT initiatives • UKCS reserves • Brown field growth • Reservoir surveillance • General issues • Field observations • Conclusions

  4. DTI-LCU aim • Maximise economic recovery of UK oil & gas • while minimising environmental impact

  5. Pre-development discussions AFRs submitted / Addenda to FDP Field determination issued FDP approved Field start-up COP Phased development ? Reservoir surveillance is important throughout field life • Need to establish economic viability of reservoir, .e.g EWTs • Gain reservoir understanding for effective management • Establish that reservoir is uneconomic prior to abandonment

  6. PILOT targets • Government – industry partnership • Striving to meet 2010 target

  7. PILOT targets • Government – industry partnership • Striving to meet 2010 target • Can only be achieved via • New field development • Brown field growth • Exploration success

  8. Actual production Forecast UKCS oil and gas production 2003 - 2010 PILOT targets 2005 & 2010 Source DTI 2003 annual reserves review UK production forecast (mmboe/d)

  9. DTI initiatives • PILOT • Fallow process • Promote licences • Access to data • Infrastructure code of practice • Brown field work group • Plus • Work with ITF on technology development • IOR conferences, web sites, eNewsletter

  10. Key Oil Gas Production to date P+P Reserves Possible reserves Unrecovered - UKCS recovery factor distribution Northern North Sea Oil Recovery 43% (upside 45%) Central North Sea Oil Recovery 46% (upside 49%) Gas Recovery 65% (upside 71%) Southern North Sea Gas Recovery 74% (upside 78%) Source DTI

  11. Improving brown field recovery Source UK Oil & Gas Commemorative Volumes

  12. Brown field growth • Brown field WG addressing barriers • Typical success factors • Cost control • Combining technologies • Technological advances • Drilling & completion • Geo-steering • Sub-sea tie-back • Improved reservoir understanding • Integrated approach • 3D/4D advances

  13. By-passed & trapped oil • Causes • Reservoir compartmentalisation • Fault shadows • Heterogeneity • Attics • Opportunities • Better utilise injection • Infill / sidetrack locations • Well work / re-perforation / water or gas shut-off

  14. 1) Existing wells draining effectively?

  15. Massive sands – un-perforated intervals Existing B2 perforations 10383 – 10423 ft md Un-perforated 10423 – 10470 ft md Existing B2 perforations 10478 – 10498 ft md 1) Existing wells draining effectively?

  16. 2) Existing wells draining effectively?

  17. Channel sands – un-perforated interval Un-perforated interval 11,770 – 11,790 ft md 2) Existing wells draining effectively?

  18. Gamma ray spikes – could they be horizontal barriers? 3) Existing wells draining effectively?

  19. Typical surveillance approaches • Routine • RFT, LWD, logging • Production performance • Non-routine • 3D/4D, geochem, geomech, SrRSA • Permanent surveillance • Difficulty in estimating value • More advanced cost/benefit analysis?

  20. Andrew production & 4D surveys Water Rate Maximising Brown field Recovery OIL Rate Baseline 3D 2001 2002 2004 3D/4D Survey acquisition

  21. Surveillance challenges – past and present • Compartmentalisation • Impacted injection strategies • Hydraulic fracturing • Poorly controlled water injection • Marginal / sub-sea developments • Pre-drilled wells • Based on static data • Non-optimum well placement • Defer injection wells? • Inaccurate zonal allocation • Inability to model reservoir

  22. Key Developed P+P Developed Fields Possible SST P+P SST Possible Undeveloped Probable Undeveloped Possible Potential Additional UKCS reserves categorised by development type UKCS reserves 20 billion boe Undeveloped Platform Fields Subsea tiebacks FPFs/FPSOs Source DTI web page

  23. Way forward - reservoir surveillance • Continue to refine and improve surveillance • Down-hole flow- & pressure-meters • By zone • Continue to integrate data observations • More sophisticated analysis • Tailor strategy to specific reservoir situation • Address key uncertainties • Develop case for thorough data acquisition

  24. For DTI oil & gas information: Thank you for listening http://www.og.dti.gov.uk/ or contact: colin.cranfield@dti.gsi.gov.uk 01224 254066

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