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

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

2

Basel reservoir: induced seismicity too

high, Permeability too low 3

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.

4

Concept DHM Basel vs.

„new“ horizontal multi-stage system 5

6

Drilling

Tricone drill bits

PDC bit

Weight on Bit

Rotary steerable

Multi-stage completion string

7

Completion and

Stimulation

Swellable packers

Safety measures and groundwater

protection

8

Conceptual design

9

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

Traffic light system with lower thresholds

A system of predefined

thresholds allows an

automated stop before

damage occurs

safety buffer

11

Probabilistic risk study

according to SED philosophy & ATLS

R=700m

R=300m

M=2

P(M>2.6)=5%

12

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

13

Project site Haute-Sorne, JU

14

Power plant contruction permit: Pmax = 5 MWel

Electrical Power will be sold to Swissgrid

plans: Kury&Staehelin

15

Accompanying Group

Deliver detailed information to all stakeholders

Communication relay with the population

Project improvement driven by the group’s feedback

16

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+

17

Geothermie - Aus gutem Grund