forages profonds et géothermie - chgeol · swiss competence centre for deep geothermal energy 2 ....
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Forages profonds et
Géothermie
Olivier Zingg, chef de projet Suisse romande
CHGEOL, Zurich, le 27 mars 2014
CENTRE DE COMPÉTENCE SUISSE EN
GÉOTHERMIE PROFONDE POUR LA PRODUCTION
D’ÉLECTRICITÉ ET DE CHALEUR
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Company founded 2010 by 7 Swiss energy
providers to evaluate and develop the vast
potential of deep geothermal energy.
Currently planning or developing projects in
the canons of JU, TG, VD and LU
Geo-Energie Suisse AG Swiss competence centre for deep geothermal energy
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Basel reservoir: induced seismicity too
high, Permeability too low 3
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Key findings on induced seismicity (Serianex, 2009):
Magnitude increases with stimulated reservoir area
Detailed analysis of the Basel data set and numerical simulations
corroborate this general relationship from many data sets worldwide.
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Concept DHM Basel vs.
„new“ horizontal multi-stage system 5
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Drilling
Tricone drill bits
PDC bit
Weight on Bit
Rotary steerable
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Multi-stage completion string
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Completion and
Stimulation
Swellable packers
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Safety measures and groundwater
protection
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Conceptual design
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Deterministic study (Q-con)
Numerical modeling of ground motions
Conservative limit 3 mm/s
Mw=2.6
Damage < 5000 CHF Pgv [mm/s]
10
3 mm/s
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Traffic light system with lower thresholds
A system of predefined
thresholds allows an
automated stop before
damage occurs
safety buffer
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Probabilistic risk study
according to SED philosophy & ATLS
R=700m
R=300m
M=2
P(M>2.6)=5%
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Efficiency of the multi-stage vs. single
open-hole systems
Utilisation System Increase Factor of:
El. Power Costs
Vertical Single-Open-Hole-System, 1 fracture 1 1
Single-Open-Hole-System, 3 fractures 1.8 1.2
Multi-Stage-System; 50% failure rate of stages. 2.9 1.6
Multi-Stage-System; 30% failure rate of stages. 4.2 1.6
Multi-Stage-System; 0% failure rate of stages. 6.2 1.6
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Power plant contruction permit: Pmax = 5 MWel
Electrical Power will be sold to Swissgrid
plans: Kury&Staehelin
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Accompanying Group
Deliver detailed information to all stakeholders
Communication relay with the population
Project improvement driven by the group’s feedback
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Time plan Haute-Sorne
Preliminary impact and risk studies
- Accompanying groups
- Application for construction permit and
main environmental impact and risk studies
Examination by authorities
Risk guarantee BFE/Swissgrid
Drilling
Power plant working
2012
2013
2014
2015
2017
2020+
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Geothermie - Aus gutem Grund