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Cyclic hydraulic stimulation design to develop Enhanced Geothermal Systems

Authors
/persons/resource/zimm

Zimmermann,  G.
6.2 Geothermal Energy Systems, 6.0 Geotechnologies, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/hannes

Hofmann,  Hannes
6.2 Geothermal Energy Systems, 6.0 Geotechnologies, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/zang

Zang,  A.
2.6 Seismic Hazard and Stress Field, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/ove

Stephansson,  Ove
2.6 Seismic Hazard and Stress Field, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/farkas

Farkas,  Marton Pal
6.2 Geothermal Energy Systems, 6.0 Geotechnologies, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/jsyoon

Yoon,  J.-S.
2.6 Seismic Hazard and Stress Field, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/huenges

Huenges,  E.
6.2 Geothermal Energy Systems, 6.0 Geotechnologies, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Zhuang,  L.
External Organizations (TEMPORARY!);

/persons/resource/kykim

Kim,  K. Y.
6.2 Geothermal Energy Systems, 6.0 Geotechnologies, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/kibok

Min,  Ki-Bok
6.2 Geothermal Energy Systems, 6.0 Geotechnologies, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Zimmermann, G., Hofmann, H., Zang, A., Stephansson, O., Farkas, M. P., Yoon, J.-S., Huenges, E., Zhuang, L., Kim, K. Y., Min, K.-B. (2018): Cyclic hydraulic stimulation design to develop Enhanced Geothermal Systems - Abstracts, International Workshop on Geothermal Energy (Manchester, UK 2018).


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_3742924
Abstract
Enhanced Geothermal Systems (EGS) are required to extract economic amounts of heat from low permeable geothermal reservoirs. We present hydraulic stimulation scenarios applying various cyclic stimulation design. The general aim is to reduce the risks of unwanted seismic events beyond a certain threshold depending on the vulnerability and exposure of people, buildings and infrastructure. The examples include hydraulic stimulation designs from modelling and from different scales of investigation. By discrete element modelling we could simulate the advantage of a cyclic stimulation design with a reduced seismic released energy compared to a conventional treatment. Experiments on the laboratory scale revealed a reduction of formation breakdown pressure for cyclic loading and were visualised by CT scans. A new advanced protocol of progressively increased cyclic injection and a pulsed injection design for hydraulic fracturing experiments were performed in the Hard Rock Laboratory in Äspö in Sweden and were accompanied by monitoring of acoustic emissions. The cyclic stimulation scheme of loading and unloading the fracturing net pressure led to a lower accompanied seismicity but simultaneously increase the permeability of the treated rock intervals. From all these experiences a specially adjusted protocol for a field experiment at the EGS site in Pohang, Republic of Korea, was developed and tested in August 2017. The general aim was to keep the seismicity below a tolerable magnitude and develop a suitable downhole heat exchanger for an economic electricity provision.