Injection Triggered Occlusion of Flow Pathways in a Sedimentary Aquifer in Hungary

Maren Brehme, Kerstin Nowak, Marko Abel, Istvan Siklosi, Cees Willems, Ernst Huenges

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Abstract

Reasons for injectivity decline were investigated at a geothermal site located in Mezőberény, SE Hungary. Due to low injectivities, production rates must be reduced, and the site faces negative commercial implications. In addition to historical operation data, fluid and rock samples were investigated in the laboratory. Analysis and experiments focus on physical, chemical and biological processes and their interaction.
Results show different processes being responsible for injection-triggered occlusion of flow pathways. Fines migration is caused by washouts in loosely cemented rocks, from where fine sand or clay particles are transported and injected into lower aquifer layers. Precipitation of minerals is caused by cooling or oxygen exposure. Biological activity is seen at production and injection site.
In order to fully understand the processes taking place in the injection well, borehole measurements will be run in summer 2019.
After evaluating the results, a specially tailored stimulation concept will be applied in the injection well. A combined chemical-mechanical
treatment takes place at different depth. Borehole measurements and hydraulic tests will be done again after the stimulation to show the effect of the stimulation. A multiple monitoring and sampling program came along with activities onsite. Activities are taking place in the frame of the DESTRESS project. The DESTRESS project has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement No 691728.
Original languageEnglish
Publication statusAccepted/In press - 26 Apr 2020
EventWorld Geothermal Congress 2020 - Reykjavik, Iceland
Duration: 21 May 202026 May 2020
https://www.wgc2020.com/

Conference

ConferenceWorld Geothermal Congress 2020
Abbreviated titleWGC 2020
CountryIceland
CityReykjavik
Period21/05/2026/05/20
Internet address

Keywords

  • geothermal
  • Hot Sedimentary Aquifers
  • Injectivity
  • Scaling
  • Connectivity

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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