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  Barite Scale Formation and Injectivity Loss Models for Geothermal Systems

Tranter, M. A., De Lucia, M., Wolfgramm, M., Kühn, M. (2020): Barite Scale Formation and Injectivity Loss Models for Geothermal Systems. - Water, 12, 11, 3078.
https://doi.org/10.3390/w12113078

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Tranter, Morgan A1, Autor              
De Lucia, M.1, Autor              
Wolfgramm, Markus2, Autor
Kühn, M.1, Autor              
Affiliations:
13.4 Fluid Systems Modelling, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146047              
2External Organizations, ou_persistent22              

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Schlagwörter: reactive transport; radial flow; geothermal energy; scaling; phreeqc; formation damage
 Zusammenfassung: Barite scales in geothermal installations are a highly unwanted effect of circulating deep saline fluids. They build up in the reservoir if supersaturated fluids are re-injected, leading to irreversible loss of injectivity. A model is presented for calculating the total expected barite precipitation. To determine the related injectivity decline over time, the spatial precipitation distribution in the subsurface near the injection well is assessed by modelling barite growth kinetics in a radially diverging Darcy flow domain. Flow and reservoir properties as well as fluid chemistry are chosen to represent reservoirs subject to geothermal exploration located in the North German Basin (NGB) and the Upper Rhine Graben (URG) in Germany. Fluids encountered at similar depths are hotter in the URG, while they are more saline in the NGB. The associated scaling amount normalised to flow rate is similar for both regions. The predicted injectivity decline after 10 years, on the other hand, is far greater for the NGB (64%) compared to the URG (24%), due to the temperature- and salinity-dependent precipitation rate. The systems in the NGB are at higher risk. Finally, a lightweight score is developed for approximating the injectivity loss using the Damköhler number, flow rate and total barite scaling potential. This formula can be easily applied to geothermal installations without running complex reactive transport simulations.

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Sprache(n): eng - Englisch
 Datum: 2020-10-252020-10-012020-10-252020-11-032020
 Publikationsstatus: Final veröffentlicht
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 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Interne Begutachtung
 Identifikatoren: DOI: 10.3390/w12113078
GFZPOF: p3 PT5 Georesources
 Art des Abschluß: -

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Titel: Water
Genre der Quelle: Zeitschrift, SCI, Scopus, oa
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 12 (11) Artikelnummer: 3078 Start- / Endseite: - Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/140903
Publisher: MDPI