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SOULTZ E.G.S. Pilot Plant Current status of the project January 2006 INTRODUCTION • The Soultz “Enhanced Geothermal System” (EGS) Pilot Plant : an European Project (EC) with the support of France (ADEME) and Germany (BMU), co-financed by Industrial Partners (ES, PW, EDF) • Starting of the investigation on the Soultz-sous-Forêts site : 1987 • First circulation test between GPK2 and GPK1 : 1997 • Current EGS Pilot Plant in 2 phases : – Phase I (2001-2005) : Drilling of the deep wells and reservoir stimulation – Phase II (2004-2008) : Circulation tests and production of electrical energy PARTNERS AND SCIENTIFIC COOPERATION • Funding Partners (Policy Group) • EEIG Partners (Consortium Agreement) European Commission (EC) ADEME (France) BMU (Germany) EEIG (contributing members) BRGM (France) CNRS (France) IFE (Norway) DHM (Switzerland) BGR (Germany) GGA (Germany) MeSy (Germany) GTC (Germany) • EEIG Members Electricité de Strasbourg (ÉS) Pfalzwerke (PW) Electricité de France (EDF) BESTEC (non contributing member) • Other Partners ARMINES (France) GEOWATT (Switzerland) EDF R&D (France & Germany) SCHEMATIC PRESENTATION OF THE EGS PILOT PLANT Secondary Loop (Surface) : 25MWth 25MWth GPK3 GPK2 GPK4 Expected surface temperature : 185 °C Heat exchanging system Available thermal energy : 50 MWth Surface power plant facilities Produced electrical energy : 5 MWe Sédiments 1500m Principle : Convert geothermal heat in useful energy (electricity) Granite Primary Loop (Underground) : 35 à 50 Kg/s 35 à 50 Kg/s 70 à 100Kg/s #4250m 5000m >200°C 2 production wells, 1 re-injection well “Closed” brine circulation Expected Flowrate : 70-100 l/s Depth : 4500-5000 m Bottom temperature : 200 °C Pumping system (EGS) #600m Principle : Extract geothermal heat from hot rocks FIRST HYDRAULIC CIRCULATION TEST (2005) • Circulation test between the 3 wells without production pumps (buoyancy effect), with a cooling system (heat exchanger, lagoon), and re-injection of the cooled geothermal brine in the central well • Closed loop under full automation • Duration of the test : 5 months (mid July – mid Dec.) • Tracing test by fluorescein spot in the injection well • Seismic monitoring RESULTS OF THE TEST Main results December 2005: Hydraulics GPK2 GPK3 GPK4 F2 = f2 + f3,2 F3=F2 + F4 F4 = f4+ f3,4 • Closed loop circulation test • Duration: > 5 Months • GPK2: f2 ∆P2 f3,2 ∆P3 f3,4 ∆P4 f4 Infinite natural geothermal reservoir No Production pumps: Only buoyancy effect Production Well head pressure kept between 0.5 and 1.2 MPa 165 000 m3 of brine produced from GPK2 40 000 m3 of brine produced from GPK4 – – F2 # 12 l/s Temp. #160°C Productivity Index # 10 l/s/MPa • GPK4: – – F4 # 3l/s Temp. #120°C Productivity Index # 3.5 l/s/MPa • GPK3: – – – F3=F2+F4 = 15 l/s Temp. #60°C (After cooling # 6MWth) Injectivity index # 2.5 l/s/MPa SN fluorescein concentration (µg/l) 1000 Main results December 2005: Fluorescein concentrations analyzed in the 900 fluid discharged from the well 800 GPK-2 Closed loop circulation test: 700 Tracing ,Fluid chemistry,Scaling 600 500 400 Production GPK2: 85% Brine Production GPK4: 78% Brine 300 200 100 0 07/07/05 27/07/05 16/08/05 05/09/05 25/09/05 15/10/05 04/11/05 24/11/05 14/12/05 Time (days) GPK2 1 SN fluorescein concentration (µg/l) 50 40 Fluorescein concentrations analyzed in the fluid discharged from the well GPK-4 2 30 GPK3 GPK4 3(?) Interpreted origins of the productions GPK4 20 10 GPK4 GPK4 injection of 150 kg of SN fluorescein dissolved in 950 l of fresh water Inflow of geothermal brine Inflow of geothermal brine 0 07/07/05 27/07/05 16/08/05 05/09/05 25/09/05 15/10/05 04/11/05 24/11/05 14/12/05 Time (days) Gaz composition: CO2: 56% (GPK2) to 61% (GPK4) N2 : 35% (GPK2) to 31% (GPK4) CH4: 6,3% (GPK2) to 5,8% (GPK4) He: 2% (GPK2) to 1,7% (GPK4) H2 : 1,9% (GPK2) to 2,8% (GPK4) All results from B. Sanjuan et al. Scaling composition: 67% Fe3O4(Magnetite) 12 % FeCO3(Siderite) 10% CaCO3 (Calcite) 3.5% PbS (Galena) 2% BaSO4 + SrSO4 2% SiO2 (Silica) 1% ZnS(Sphalerite Depth Depth Main results December 2005: Closed loop circulation test: Microseismicity: July to November 2005 CONCLUSIONS / CHALLENGES (2006 – 2007) • Main current challenge : to improve the productivity of GPK4 well (new stimulation) and also solve the issue of GPK3 poor injectivity • To order and install the production pumps (ESP and LSP technologies) in GPK2 and GPK4 in a remote and very aggressive medium (depth issue, HT, corrosion) • To consolidate the new closed loop system with the production pumps and an adapted cooling system • To design an install in parallel a first demonstrative power unit of 1.5 MWe MERCI / THANK YOU / DANKESCHÖN !