The - and Prometheus-Project:

Concepts for the Extraction of Heat from Deep and Tight Sedimentary Rock

Jens Orzol (1), F. Rummel (2), R. Jung (1)

(1): GGA-Institute, (2): Ruhr-University Bochum/MeSy GmbH

Classically:

Geothermal energy use of Hydrothermal Resources and by HDR/EGS-technology in crystalline rocksOne step further:Extend geothermal energy extraction to deep and tight sedimentary rocks

GeneSys & Prometheussedimentary rockslow porosity & permeabilitycreate artificial geothermal systems (EGS)transfer waterfrac technology to sedimentsIs there a self propping mechanism for sediments?fracture propagation in layered sediments?.

stimulated heat exchanger

carboniferous rocks in a quarry south of well site faults and fractures from variscan orogeny

extrapolated to 4000 m:

101C 115C 128C

conservative estimate

status: detailed feasibility study finished currently: planning of an exploratory well

develop and test one well conceptsdirect use: range of few MWthermalpotentially economically attractive for numerous consumers

Research well Horstberg Z1 (4100 m) for in-situ testing and concept developmentHannover site: pilot project for geothermal supply of GeoCenter

Stimulation operations Injection of 20.000 m fresh water Creation of a large fracture with high conductivity

50 l/s 330 bar

Cyclic operation sheme1) Injection of cold water into frac

2) shut-in, where water heats up

3) production of hot water from frac

4) energy extraction by heat-exchanger

deep vertical circulation concept

deep vertical circulation concept

deep vertical circulation concept

Challenges at Hannover site (GeoCenter) deep drilling close to residential area water supply for stimulation frac-monitoring

Conclusions/Outlookprojects aim to transfer EGS concepts to sedimentsone well concepts and classical HDRWater frac technology applicable to sedimentsfracture: large area, high conductivity one well concepts provenPreparatory work for Hannover and Bochum site starteddrilling 2006/2007Thank you!

Cyclic operation sheme1) Injection of cold water into frac

Cyclic operation sheme2) Heating up of water in frac

Cyclic operation sheme3) Production of hot water from frac

Fracture height

fracture propagates through claystone!Solling-Sdst.Detfurth-Sdst.

Derived from simpe modelsNumerous assumptions & risks

available data from vicinity, extrapolated to 4000 m: 101 - 115 - 128 , derived from heat flow and thermal conductivities normal conditions. heat flow 54 -60 mW/m, conservative estimate