Forage géothermique profond ECOGI

The Rittershoffen Case study (France)
Dr Albert Genter, ES-Géothermie
28/04/2016, Reykjavik Iceland
IGC2016 26-29 April 2016
Case Studies - Operability
Outline
The Rittershoffen heat project in the Upper Rhine Graben
 Why a successful geothermal story?
 Exploration, deep drilling and reservoir development
 Surface pipe deployment and geothermal plant construction
 Commissioning, inauguration ceremony and operatibility in 2016
Rittershoffen in the Upper Rhine Graben (URG)
Temperature data from Liag
Hurtig et al, 1992
Several large-scale thermal anomalies in Europe
Tertiary grabens (Upper Rhine Valley) with many geothermal projects
Temperature range > 150°C
EGS technology: a reality in the URG
No active volcanoes in the Upper Rhine Graben
No hydrothermal manifestations on surface
Convective cells in hard fractured rocks at depth (>1.5km)
High geothermal gradients from surface to 1.5km : 100°C/km
Convective cell modeling
(Magnenet et al., 2014)
Improving of well performance by applying thermal, chemical and hydraulic stimulations
Very low nuisance for the local population:
 Low induced seismicity activity (no IS event felt),
 Environmentally-free products were used for chemical treatments: dissolution of calcite minerals in
fractures
Provide heat for industry (steam)
Other geothermal projects (Heat, Electricity) are in the « tube » in Northern Alsace
The Rittershoffen Case Study
First geothermal project at high temperature (>150°C) in France for a heat application
(steam): 24 MWth
The Rittershoffen project = the ECOGI Project
Creation of a joint venture ECOGI (in French): Exploitation de la Chaleur d’Origine
Géothermale pour l’Industrie
ECOGI: Exploitation of geothermal heat for industrial applications
Enhancement Geothermal System project (EGS)
Improvement of the initial injectivity index by a factor 5 by applying thermo-chemical and
hydraulic stimulations
A poor productivity well could become a good post stimulation injectivity well
Development of expertise for stimulations, optimized well emplacement and hydraulic
testing of deep fractured hard rocks (granite, sandstone)
Location of the Rittershoffen Case study in France
Geological cross-section
Local map
Lessons learned from the Soultz-sous-Forêts EGS pilot project successfully
applied for enhancing permeability and targeting the second well
The Rittershoffen site: faults & reservoir
Geothermal target
Wells cross the fault system
Vertical fault off-set
250 m
Injection well
Vertical, 2600 m MD
Production well
Deviated to 37°, 3196m MD
Open hole section (OH)
Sandstone/Granite
OH length
600 to 1000 m
Geothermal Resource
K @ sediment/granite interface
Salinity
~100g/L
Temperature
177°C@3200 m MD
Sediments
OH
Large fractured reservoir with native brine: open system
Granite
ECOGI project: main technical phases
2011
2012
2013
2014
2015
2016
ECOGI
JV creation
Drilling
Platform construction
GRT1 Well @2560 m
Drilling and well development
Seismic
Survey
GRT2 Well @3196 m
Drilling and tracer tests
Technical Data:
2 Wells
2500-3000 m
deep
Operating hours
8.000 h/year
Temperature
170°C
Transport loop
15 km
Thermal power
24 MW
© ECOGI
Surface construction
Thermal plant
Transport loop
Bio-refinery
ECOGI plant
Commissioning
The application: bio-refinery
Roquette Frères bio-refinery in Beinheim
 Major player in starch manufacturing (3.1 B€ turnover, >8k





employees, >20 industrial sites)
Products: Sugar alcohols, Proteins & Derivatives, Starches
Markets: Nutrition, pharmacy, green chemistry
Beinheim site needs: ~ 100 MWth
Global strategy: reduction of the gas consumption by 70%:
geothermal energy, biomass, reduction of the demand
Saving about 39 000 tons per year of CO2 emission
The refinery is working 24h a day, all the year
No seasonality
Maximising the thermal recovery
The ECOGI joint venture
Joint venture: ES (40%), Roquette Frères (40%), Caisses des dépôts (20%)
55M€ total investment
25 M€ French incentive from Heat Renewable Fund (Ademe)
Short term guarantee covering 10% to 60%
Long term guarantee
Geothermal project: 25% of the energy demand
The ECOGI concept
In 2016, RF will convert 70% of its gas consumption with Renewable Energy
Geothermal energy
Biomass
Energy reduction
•
•
•
Over-heated pipeline from Rittershoffen and Beinheim
15 km length of pipes between Rittershoffen and Beinheim
A double-envelope pipe to lower energy losses (maximum 5°C)
ECOGI: a technical challenge
2 wells targeting fractures at 2500m TVD
COMPLETED (177°C at 3196 m MD)
Plant construction
Will be finished in May 2016
 Commissioning planned for June 2016
15 km pipes
Losses less than 5°C
COMPLETED
ECOGI: a technical challenge
2 wells targeting fractures at 2500m TVD
COMPLETED (177°C at 3196 m MD)
Plant construction
Will be finished in May 2016
 Commissioning planned for June 2016
15 km pipes
Losses less than 5°C
COMPLETED
ECOGI: a technical challenge
2 wells targeting fractures at 2500m TVD
COMPLETED (177°C at 3196 m MD)
Plant construction
Will be finished in May 2016
 Commissioning planned for June 2016
15 km pipes
Losses less than 5°C
COMPLETED
Over-heated pipeline from Rittershoffen and Beinheim
High temperature pipe:
Steel cased pipe with
vacuum, pre-loaded pipe
ID: 250 mm
OD: 450 mm
Heat loss: 4°C/15km
Return pipe:
Insulated pipe
ID:250 mm
OD: 450 mm
Heat loss: <3°C/15km
17
Examples of civil works for constructing the thermal loop
The geothermal plant
An Upper Rhine Valley alliance
ÉCOGI is a new geothermal project in France which benefits from the know-how of
the German-French pilote project of Soultz-sous-Forêts
ÉCOGI highlights the French know-how in deep geothermal energy and contributes to
the development of industry in Northern Alsace
For drilling activities, French companies are involved: drilling operations, borehole
supervision and prime contractor, well testing, cementing, geological & fluid data
Project owner delegate: ÉS Géothermie, a daughter company from Groupe ÉS, is
specialized in the technical supervision of geothermal energy project
German expertise is involved through the reservoir development program
Local support from academic research for seismic monitoring from Strasbourg
university (EOST-LABEX in Deep Geothermal energy) and Karlsruhle with KIT
Pipe construction & geothermal plant construction (heat exchanger, filters, electricity,
production and injection pumps, and civil works)
Geothermal plant commissioning: April to June 2016
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