INTRODUCING GEOWATT AG

Geothermal Energy utilization

Engineering

Hydrogeology

Numerics

• Resource Evaluation• Generic studies High- and Low-Enthalpy Systems• Courses at University and Engineering Schools

• Dimensioning Heatng/Cooling (BHE-Felder)• Reservoir Engineering• Measurements

• Tunneling: Inflow sceanario• Flow system

• Coupled 3D-FE calculations• Data bank• Specific simulation tools

INTRODUCING GEOWATT AG

BHE Engineering

Expl. Grand Hotel Dolder in Zürich

1 GWh/yr heating and 1 GWh/yr coolingusing 81 BHE of totally 10‘000 m length

INTRODUCING GEOWATT AG

Hydraulic & Tunnelling

Expl. Koralm-Tunnel

• water inflow to tunnel• change of mountain water table

Tunnel

Western model area

Eastern model area

Relevant faults along the tunnel

Water inflow into the tunnel

XY

Z

Cut through west model

ORION

WinFra

INTRODUCING GEOWATT AG

Reservoir Engineering

pT-Simulator HEX-B• Bsp. Europ. EGS Project Soultz-sous-Forêts, France• Stimulation GPK3, 2003

Bohrlochköpfe GPK2/GPK3

Berechnung des

Temp./Druck-Profils

mit HEX-B

ca. 10 Tage

p(z,t)tmp(z,t)

Flow Exit/Entry points

Q [l/s]

HEX-B

INTRODUCING GEOWATT AG

Reservoir Engineering Stimulations-Code HEX-S

• Bsp. EGS Project Coso, USA• Hydromechanisch gekoppelter Code

Deterministische Strukturen (UBI)

Stochastische Strukturen ( UBI)

HEX-S

Pressure distribution & seismic events in reservoir after24 hrs injektion

time [s]

Pdh[P

a]

Flo

wra

te[l/s]

0 100000 200000 3000000

5E+06

1E+07

1.5E+07

2E+07

2.5E+07

0

10

20

30

40

50

60

70

80

90

100

Pdh B1

Qinj [l/s]

Pdh C2

Pdh C3

GPK4 Stimulation Sep.2004; Modell b1/cx

IImodl : 6.9-7.4 IImodl : 9.7-10.7

Wellhead-Pressure

Y

X

Z

1.70E+071.60E+071.50E+071.40E+071.30E+071.20E+071.10E+071.00E+079.00E+068.00E+067.00E+066.00E+065.00E+064.00E+063.00E+062.00E+061.00E+06

INTRODUCING GEOWATT AG

Resource Evaluation

Construction of 3D geological model

Discretization in a 3D representation model

Integration of petrophysical data

Numerical simulation Temperature data analysis

Data collection

GeoProd

Utilization fract. aquiferExample: Doublet plant Riehen, CH

Injection: Production:Riehen1 Riehen2

•network of fracture zones with 100 m spacing•hydraulic conductivity 105 times higher than matrix

Riehen 1Production

Riehen 2Injection

West East

fracture zones

Riehen 1Production

100 m spacing0

height 20 m

Riehen 2Injection

Riehen 1Production

WEST EAST

m.a.s.l. m.a.s.l.

Riehen 2Injection

Riehen 1Production

WEST EAST

m.a.s.l. m.a.s.l.

FRACTure

Analysis of fractured dataExample: Coso stimulation prediction

Analysis of fracture characteristics of flowing zones

Hydro-mechanical simulations• Deterministic• Stochastic fracture

HEX-S

ENGINE Contributions

Contributions foreseen in

– WP4: Drilling, stimulation and reservoir assessment– WP6: Expertise on investigation of Unconventional

Geothermal Systems and Enhanced Geothermal Systems– WP9: Risk evaluation for the development of geothermal en

ergy

Workshop "Stimulation of Reservoir and Induced Microseismicity"

29. June – 30. June 2006

Kartause Ittingen, Warth, Switzerland

1. July 2006: Excursion "Grimsel Test Site"

Registration deadline: 25. March 2006