Modeling of Short-Term Stimulation and Long-Term Operation of EGS - PowerPoint PPT Presentation

Nov 18, 2023 •157 likes •236 views

Modeling of Short-Term Stimulation and Long-Term Operation of EGS Reservoirs T. Kohl & T. Mgel GEOWATT AG Dohlenweg 28, CH-8050 Zrich Contents Investigation of the dynamic response of an "Enhanced Geothermal Systems" to

Modeling of Short-Term Stimulation and Long-Term Operation of EGS Reservoirs T. Kohl & T. Mégel GEOWATT AG Dohlenweg 28, CH-8050 Zürich
Contents � Investigation of the dynamic response of an "Enhanced Geothermal Systems" to forced injection of cold fluid � Individual processes (pressure, temperature and stress) result in specific time-constants. � Extending the evaluation can usually only be carried out by numerical modeling • Deterministic reservoir models • Stochastic reservoir models � H-T-M evaluations calculated with the simulators FRACTure and HEX-S (identical FE kernel)
Experience on deterministic H-T-M simulations 3D Reservoir � 4 fracture zones � Poro-Elasticity & Thermo-Elasticity (Kohl, 1995) r 30 years � Normal aperture compliance Temperature � No shearing -> not suited for hydraulic stimulation X Y S 22 stress change
3D- Deterministic Fracture Geometry Dynamic Long Term Behaviour Situation after 10 years 0 0 z aperture [m] 2.5E-04 -20 -20 Synthetic example 2.4E-04 2.3E-04 -40 -40 aperture: a 0 =200 µ m 2.2E-04 2.1E-04 -60 -60 2.0E-04 -80 -80 t=10yrs -100 -100 -5100 -5100 -5050 -5050 -5000 -5000 -4950 -4950 y Situation after 30 years t=30yrs ∆ T [K] 0 0 z -5 -20 -20 -10 -15 -40 -40 -20 -25 -60 -60 -30 -35 -80 -80 -40 -45 -100 -100 -5100 -5100 -5050 -5050 -5000 -5000 -4950 -4950 Darcy-velocity y -1 1 m s
Example: Simulation GPK4 Development of aperture ( ≅ permeab.) 2.7 h 5 h 20 h 36 h 53 h Iso-Surface = 0.0001 m
Reservoir Pressure Distribution Simulated shearing events & pressure distribution GPK3 Z Y X Flow aligned along seismic 1.70E+07 1.60E+07 structures 1.50E+07 1.40E+07 1.30E+07 1.20E+07 1.10E+07 Seismicity connected to zones of 1.00E+07 9.00E+06 high pressure 8.00E+06 7.00E+06 6.00E+06 5.00E+06 4.00E+06 3.00E+06 2.00E+06 1.00E+06
Forecast GPK4 stimulation: HEX-S Hydraulic Model Predicted evolution of shearing events at GPK4 after 1 day stimulation View from West Plane View Events are not location-corrected Path of development

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