the - and prometheus-project: concepts for the extraction of heat from deep and tight sedimentary...
TRANSCRIPT
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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
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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
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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?.
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stimulated heat exchanger
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carboniferous rocks in a quarry south of well site faults and fractures from variscan orogeny
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extrapolated to 4000 m:
101C 115C 128C
conservative estimate
status: detailed feasibility study finished currently: planning of an exploratory well
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develop and test one well conceptsdirect use: range of few MWthermalpotentially economically attractive for numerous consumers
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Research well Horstberg Z1 (4100 m) for in-situ testing and concept developmentHannover site: pilot project for geothermal supply of GeoCenter
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Stimulation operations Injection of 20.000 m fresh water Creation of a large fracture with high conductivity
50 l/s 330 bar
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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
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deep vertical circulation concept
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deep vertical circulation concept
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deep vertical circulation concept
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Challenges at Hannover site (GeoCenter) deep drilling close to residential area water supply for stimulation frac-monitoring
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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!
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Cyclic operation sheme1) Injection of cold water into frac
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Cyclic operation sheme2) Heating up of water in frac
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Cyclic operation sheme3) Production of hot water from frac
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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