SOULTZ E.G.S. Pilot Plant Current status of the project January 2006

1. SOULTZ E.G.S. Pilot Plant Current status of the project January 2006

2. 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

3. PARTNERS AND SCIENTIFIC COOPERATION

4. SCHEMATIC PRESENTATION OF THE EGS PILOT PLANT Secondary Loop (Surface) : Expected surface temperature : 185 °C Heat exchanging system Available thermal energy : 50 MWth Surface power plant facilities Produced electrical energy : 5 MWe Principle : Convert geothermal heat in useful energy (electricity) Primary Loop (Underground) : 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) Principle : Extract geothermal heat from hot rocks

6. 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 

7. Main results December 2005:Hydraulics • Closed loop circulation test • Duration: > 5 Months • GPK2: • 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 GPK2 GPK3 GPK4 F2 = f2+ f3,2 F3=F2 + F4 F4 = f4+ f3,4 f2 f4 f3,2 f3,4 ∆P2 ∆P3 ∆P4 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

8. 50 40 30 SN fluorescein concentration (µg/l) 20 injection of 150 kg of SN fluorescein 10 dissolved in 950 l of fresh water 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) Main results December 2005: Closed loop circulation test: Tracing ,Fluid chemistry,Scaling Production GPK2: 85% Brine Production GPK4: 78% Brine Fluorescein concentrations analyzed in the fluid discharged from the wellGPK-4 Interpreted origins of the productions GPK4 GPK4 GPK4 Scaling composition: 67% Fe3O4(Magnetite) 12 % FeCO3(Siderite) 10% CaCO3 (Calcite) 3.5% PbS (Galena) 2% BaSO4 + SrSO4 2% SiO2 (Silica) 1% ZnS(Sphalerite 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.

9. Main results December 2005: Closed loop circulation test: Microseismicity: July to November 2005 Depth Depth

10. 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

11. MERCI / THANK YOU / DANKESCHÖN !