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Published byBarrie Harvey Modified over 9 years ago
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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 rocks One step further: Extend geothermal energy extraction to deep and tight sedimentary rocks
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GeneSys & Prometheus sedimentary rocks low porosity & permeability create artificial geothermal systems (EGS) transfer waterfrac technology to sediments Is 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: 101°C – 115°C – 128°C conservative estimate status: detailed feasibility study finished currently: planning of an exploratory well
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develop and test one well concepts direct use: range of few MW thermal potentially economically attractive for numerous consumers
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F. Böker, 1994 Research well Horstberg Z1 (4100 m) for in-situ testing and concept development Hannover site: pilot project for geothermal supply of GeoCenter
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Stimulation operations Injection of 20.000 m³ fresh water Creation of a large fracture with high conductivity 50 l/s ≈ 330 bar
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Cyclic operation sheme 1) 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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Challenges at Hannover site (GeoCenter) deep drilling close to residential area water supply for stimulation frac-monitoring F. Böker, 1994
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Conclusions/Outlook projects aim to transfer EGS concepts to sediments one well concepts and „classical“ HDR Water frac technology applicable to sediments fracture: large area, high conductivity one well concepts proven Preparatory work for Hannover and Bochum site started drilling 2006/2007 Thank you!
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Cyclic operation sheme 1) Injection of cold water into frac
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Cyclic operation sheme 2) Heating up of water in frac
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Cyclic operation sheme 3) Production of hot water from frac
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Fracture height ≈ 200 m ! fracture propagates through claystone! Solling-Sdst. Detfurth-Sdst.
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