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Hydraulic stimulation of EGS: Comparison of the HDR-project Soultz and the

T. Tischner, R. Jung, J. Orzol. Hydraulic stimulation of EGS: Comparison of the HDR-project Soultz and the GeneSys-project Hannover. Content Basic concepts of both projects Stress field Stimulation operations Hydraulic and seismic observations Conceptual Models. HDR/EGS.

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Hydraulic stimulation of EGS: Comparison of the HDR-project Soultz and the

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  1. T. Tischner, R. Jung, J. Orzol Hydraulic stimulation of EGS: Comparison of the HDR-project Soultz and the GeneSys-project Hannover

  2. Content • Basic concepts of both projects • Stress field • Stimulation operations • Hydraulic and seismic observations • Conceptual Models

  3. HDR/EGS Pilot plant in Soultz The HDR base module 1.5 + 4.5 MWe GPK 2 GPK 4 Crystalline rocks Production Production 1400 m 50 kg/s 50 kg/s 100 kg/s GPK 3 5000m Depth 600 m 600 m 200 C o

  4. GeneSys: Original concept Reinjection Production zone fault Large Hydraulic Fracture

  5. 330 bar Stimulation Detfurth (50 l/s, 20 000m3) Stimulation Volpriehausen (600m3) 450 bar Well Horstberg (GeneSys) 3600m Salt Sandstone (Detfurth) Sandstone(Volpriehausen) Claystone Siltstone 4000m

  6. Stress profile Horstberg (GeneSys) Soultz • Shearing is more likely in Soultz ! • great stress differences in Horstberg

  7. Horstberg (GeneSys) Hydraulic Stimulation Soultz

  8. Horstberg • High conductive structure • Wellbore storage: 100 m3/bar • (Large tensile fracture: 100000 m2) Stimulation: Shut in • Soultz (GPK2) • High conductive structure • Wellbore storage: 1 m3/bar

  9. Horstberg 11 events: not localised Seismic events Soultz (GPK2) 30 000 events

  10. p ~ • Formation linear flow • Infinite conductive fracture Injection tests after stimulation Soultz (GPK2) Horstberg

  11. Wellbore storage: (below fracture pressure) 1 m3/bar (GPK 2) 0.1 m3/bar Soultz: Storage capacity (stiffness) remains unchanged Horstberg: Storage capacity decreases drastically after stimulation Injection tests / wellbore storage Soultz (GPK2) Horstberg Wellbore storage: (during stimulation) 1 m3/bar (GPK 2) 100 m3/bar

  12. Horstberg • Tensile fracturing • drastic change of storage • capacity • infinite conductive fracture Observations Soultz • Shearing • constant (fairly high) storage • capacity • infinite conductive fracture

  13. Siltstone/ Clay Sh Sandstone Sh Sh Siltstone/ Clay Conceptual Models Soultz (GPK2 and GPK3) (hydro-frac bounded by faults) Horstberg

  14. Injectivity during Stimulation [l/(s*bar)]: 0.4 0.3 0.2 Injectivity after Stimulation [l/(s*bar)]: (after 2 d) 0.5 0.35 0.2 Productivity/Injectivity GPK 2 GPK 3 GPK 4 Horstberg 0.4 0.08 Very effective hydraulic stimulation in Soultz !

  15. Summary • very successfull hydraulic stimulations in Soultz • succesfull application of the waterfrac concept to sandstone: • Infinite conductive fracture ! Thank you for your attention !

  16. GeneSys: Objectives • Provide 2 MWth for direct use • Single well concept • Sedimentary rocks with low permeability • Adoption water-frac technology to sediments

  17. Mohr-Circle Shearing is more likely in Soultz !

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