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GEOTHERMAL RESERVOIR MANAGEMENT. A THIRTY YEAR PRACTICE IN THE PARIS BASIN

GEOTHERMAL RESERVOIR MANAGEMENT. A THIRTY YEAR PRACTICE IN THE PARIS BASIN. Pierre UNGEMACH and Miklos ANTICS GEOPRODUCTION CONSULTANTS (GPC) Paris Nord 2, 14 rue de la Perdrix, Lot 109, B.P. 50030 95946 ROISSY CDG CEDEX, France

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GEOTHERMAL RESERVOIR MANAGEMENT. A THIRTY YEAR PRACTICE IN THE PARIS BASIN

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  1. GEOTHERMAL RESERVOIR MANAGEMENT. A THIRTY YEAR PRACTICE IN THE PARIS BASIN Pierre UNGEMACH and Miklos ANTICS GEOPRODUCTION CONSULTANTS (GPC) Paris Nord 2, 14 rue de la Perdrix, Lot 109, B.P. 50030 95946 ROISSY CDG CEDEX, France e-mail : pierre.ungemach@geoproduction.fr , m.antics@geoproduction.fr

  2. SCOPE • INTRODUCTION • HISTORICAL OVERVIEW • RESOURCE AND RESERVOIR SETTING • DEVELOPMENT STATUS AND MILESTONES • TECHNOLOGY OUTLOOK • OPERATION AND MAITENANCE • RISK ASSESSMENT • RESERVOIR MANAGEMENT / ENGINEERING / SIMULATION • SUSTAINABILITY • CONCLUSIONS

  3. HISTORICAL OVERVIEW

  4. HISTORICAL OVERVIEW

  5. RESOURCE AND RESERVOIR SETTING

  6. DEVELOPMENT STATUS AND MILESTONESLOCATION OF GEOTHERMAL DISTRIC HEATING DOUBLETS

  7. DEVELOPMENT STATUS AND MILESTONESTARGETED, ACHIEVED, FORECASTED OBJECTIVES Target Achieved Forecast (1985) 1990 2000 2006 Operating doublets 55 43 34 34 Total installed capacity (MWt) 360 260 227 200 Produced heat (GWht/yr) 2,000 1,455 1,240 1,000 Unit capacity (MWt) 6.5 6.0 6.7 5.9 Unit yield (MWht/yr) 36,000 33,800 36,200 30,000 Artificial lift wells 49 36 27 22 Self-flowing wells 6 7 7 12

  8. TECHNOLOGY OUTLOOK (1)THE GEOTHERMAL WELL DOUBLET OF HEAT MINING

  9. TECHNOLOGY OUTLOOK (2)EQUIPMENT PERFORMANCE AND LIFETIME RECORD

  10. THERMOCHEMICAL SHORTCOMINGSCORROSION AND SCALINGDRIVING MECHANISMS OF CASING DAMAGEAQUEOS CO2/H2S ENVIRONMENT

  11. WELL DRILLING/COMPLETIONANTI-CORROSION PRODUCTION WELL DESIGN

  12. THERMOCHEMICAL SHORTCOMINGSCORROSION AND SCALINGDOWNHOLE CHEMICAL INJECTION LINESSETUPS IN ARTIFICIAL LIFT WELLS

  13. OPERATION AND MAINTENANCE (1)MONITORING/SURVEILLANCE OF PRODUCTION FACILITIES • geothermal fluid • loop parameters • well deliverabilities • pump and frequency converter characteristics • inhibitor efficiencies • inhibition equipment integrity • well head integrity • surface piping control • casing inspection

  14. OPERATION AND MAINTENANCE (2)WELL WORKOVERCORROSION AND SCALING ABATEMENT • WELL WORKOVER • casing clean up • lining of damaged tubulars • fishing • reservoir stimulation • CORROSION AND SCALING ABATEMENT • downhole chemical inhibition lines • corrosion, scaling, microbiological inhibitors

  15. OPERATION AND MAINTENANCE (3)DOGGER DATABASE • Hosted on ORACLE platform • Data instructed locally via ACCESS interface

  16. RISK ASSESSMENT • Exploration (mining, geological) • Exploitation (technical, managerial) • Economic/financial (market, institutional, managerial) • Social acceptance (image)

  17. INTEGRATED GEOTHERMAL RESERVOIR MANAGEMENT

  18. RESERVOIR ENGINEERING ASSESSMENT OF RESERVOIR STRUCTURE

  19. RESERVOIR ENGINEERING. RESERVOIR LAYER STACKING

  20. RESERVOIR ENGINEERING. TEMPERATURE DECLINE AT PRODUCTION WELL VS. RESERVOIR EQUIVALENTS

  21. RESERVOIR ENGINEERINGRESERVOIR SIMULATION • CORE • Calibrated regional model, online with the Dogger database, operated as a reservoir management tool • MODELLING STRATEGIES • Regional. Overall reservoir • Subregional. Multidoublet areas • Local. Single doublet systems • OBJECTIVES • Reservoir life • Hydrodynamic interferences • Solute transport • Sustainability assessments

  22. RESERVOIR SIMULATIONSUB REGIONAL DOMAIN TRANSMISSIVITY AND INITIAL PRESSURE/TEMPERATURE DISTRIBUTION

  23. RESERVOIR SIMULATIONSUB REGIONAL DOMAIN TEMPERATURE PATTERNS (YEAR 2005)

  24. RESERVOIR SIMULATIONSUB REGIONAL DOMAIN TEMPERATURE PATTERNS (YEAR 2030)

  25. SUSTAINABLE RESERVOIR DEVELOPMENTSIMULATED SCENARIOS • WORKING ASSUMPTIONS. DESIGN FEATURES • Single/multiple well doublet/triplet heat mining arrays • Homogeneus/heterogeneus reservoir settings • Well life = 20 – 25 yrs • Reservoir life = 20 – 30 yrs (doublet/triplet thermal breakthrough time) • Well spacing = 1000 – 1500 m • Heat mining schemes/schedules • Existing doublet: 0-25 years • Mixed well triplet array: 25-50 years • New well doublet: 50-75 years • DESIGN OBJECTIVE • Avoid undue premature cooling of producing wells • Achieve a minimum 75 years reservoir life

  26. SUSTAINABLE RESERVOIR DEVELOPMENTSIMULATED SCENARIOS THE MULTIDOUBLET/HETEROGENEOUS RESERVOIR CASE. SIMULATED AREA

  27. SUSTAINABLE RESERVOIR DEVELOPMENTSIMULATED SCENARIOSTHE MULTIDOUBLET/HETEROGENEOUS RESERVOIR CASE. SIMULATED OUTPUTS (YEAR 27)

  28. SUSTAINABLE RESERVOIR DEVELOPMENTSIMULATED SCENARIOSTHE MULTIDOUBLET/HETEROGENEOUS RESERVOIR CASE. SIMULATED OUTPUTS (YEAR 52)

  29. SUSTAINABLE RESERVOIR DEVELOPMENTSIMULATED SCENARIOSTHE MULTIDOUBLET/HETEROGENEOUS RESERVOIR CASE. SIMULATED OUTPUTS (YEAR 77)

  30. SUSTAINABILITY ISSUES (1)

  31. SUSTAINABILITY ISSUES (2)

  32. ECONOMY (1)

  33. CONCLUSIONS • GDH scored well • State/public sector involvement proved a decisive impetus • Operators exhibit mature technological and entrepreneurial skills • Exploration/exploitation risks mastered to date • Sound resource/reservoir management outline • Sustainable heat mining, up to 50-75 years ahead, secured • Improve image • Environmental, clean air, benefits to boost fiscally incentive measures.

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