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Journal Article

Hydraulic history and current state of the deep geothermal reservoir Groß Schönebeck

Authors
/persons/resource/bloech

Blöcher,  G.
ICGR International Center for Geothermal Research, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/reinsch

Reinsch,  Thomas
ICGR International Center for Geothermal Research, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/janhen

Henninges,  J.
4.1 Reservoir Technologies, 4.0 Chemistry and Material Cycles, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/milsch

Milsch,  H.
ICGR International Center for Geothermal Research, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/regens

Regenspurg,  Simona
ICGR International Center for Geothermal Research, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/jule

Kummerow,  Juliane
4.1 Reservoir Technologies, 4.0 Chemistry and Material Cycles, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/francke

Francke,  H.
ICGR International Center for Geothermal Research, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/kranz

Kranz,  S.
ICGR International Center for Geothermal Research, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/saadat

Saadat,  Ali
ICGR International Center for Geothermal Research, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/zimm

Zimmermann,  G.
ICGR International Center for Geothermal Research, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/huenges

Huenges,  Ernst
4.1 Reservoir Technologies, 4.0 Chemistry and Material Cycles, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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1284966.pdf
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Citation

Blöcher, G., Reinsch, T., Henninges, J., Milsch, H., Regenspurg, S., Kummerow, J., Francke, H., Kranz, S., Saadat, A., Zimmermann, G., Huenges, E. (2016): Hydraulic history and current state of the deep geothermal reservoir Groß Schönebeck. - Geothermics, 63, 27-43.
https://doi.org/10.1016/j.geothermics.2015.07.008


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1284966
Abstract
This study addresses the thermal–hydraulic–mechanical and chemical (THMC) behaviour of a research well doublet consisting of the injection well E GrSk 3/90 and the production well Gt GrSk 4/05 A(2) in the deep geothermal reservoir of Groß Schönebeck (north of Berlin, Germany). The reservoir is located between 3815 and 4247 m below sea level in the Lower Permian of the North German Basin (NGB).Both wells were hydraulically stimulated to enhance productivity. For the production well three stimulation treatments were performed in 2007: These three treatments result in a productivity increase from 2.4 m3/(h MPa) to 14.7 m3/(h MPa). The injection well was stimulated four times in 2002/2003, resulting in a corresponding productivity increase from 0.97 m3/(h MPa) to 7.5 m3/(h MPa).The necessary infrastructure for production and subsequent injection of geothermal fluid was established in June 2011. Between June 8, 2011 and November 8, 2013, 139 individual hydraulic tests were performed with produced/injected volumes ranging from 4.4 to 2567 m3. The productivity index decreased non-linearly from 8.9 m3/(h MPa) on June 8, 2011 to 0.6 m3/(h MPa) on November 8, 2013.Five possible reasons for the productivity decrease are discussed: wellbore fill, wellbore skin, the sustainability of induced fractures, two phase flow and compartmentalisation. For all hydraulic tests, the injectivity index remains almost constant at 4.0 m3/(h MPa). During 17 of 139 hydraulic tests a sudden increase of the productivity was observed. Possible reasons for this effect are discussed: accumulation of free gas and/or fines and scales within the fracture as well as changing hydraulic properties due to changing mechanical load on the fracture.