The Influence of Chelating Agents on Clays of the Geothermal Cap Rock: Implications for Enhancing Geothermal Reservoir Quality : poster

Makungu Marco Madirisha*, C. Lievens, H.R.G.K. Hack, F.D. van der Meer

*Corresponding author for this work

Research output: Contribution to conferenceOther

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Abstract

Geothermal energy (Figure 1) is a green renewable energy source that h as potential to provide long-term energy with lower carbon footprint and maintenance costs than other renewable energy. A large portion of the world’s geothermal reserves is in sandstone reservoirs often characterized by quartz grains cemented with clays. Clays form also often the impervious boundary of the reservoir rock, the so-called caprock. Many geothermal reservoirs tend to lose permeability over time during production, therefore techniques are applied to enhance the reservoir quality in terms of fluid permeability. Partial dissolution of sand grains in the reservoir is a possibility to increase porosity and consequently permeability. However, the fluids used for dissolution should have limited reactions with the cementing clay minerals as this would cause collapse of the sandstone grain skeleton reducing permeability. Biodegradable chelating agents (BCA) compared to conventional chemicals (HF and HCl) have little reaction with clay, but can dissolve the sandstone grains; hence green
chemicals could be effective for enhancing reservoir quality. The emission of
dissolved CO2 from geothermal water becomes more of an issue recently.
Biodegradable chelating agents could reduce CO2 emission since they offer high
chelating capacities on a large variety of minerals including calcium-rich minerals. Calcium has the capacity to bond with CO2, proving to be effective for CO2 sequestration.
Original languageEnglish
Pagesposter
Publication statusPublished - 9 Aug 2019
EventInternational Conference on Energy, Aquatech and Sustainability 2019 - Nelson Mandela African Institute of Science and Technology, Arusha, Tanzania, United Republic of
Duration: 9 Aug 201913 Aug 2019
http://iceas.snu.ac.kr/

Conference

ConferenceInternational Conference on Energy, Aquatech and Sustainability 2019
Abbreviated titleICEAS 2019
CountryTanzania, United Republic of
CityArusha
Period9/08/1913/08/19
Internet address

Keywords

  • geothermal
  • chelating
  • clay cap
  • Reservoir
  • biodegradable
  • Permeability
  • CO2
  • ITC-GOLD

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    Madirisha, M. M., Lievens, C., Hack, H. R. G. K., & van der Meer, F. D. (2019). The Influence of Chelating Agents on Clays of the Geothermal Cap Rock: Implications for Enhancing Geothermal Reservoir Quality : poster. poster. International Conference on Energy, Aquatech and Sustainability 2019, Arusha, Tanzania, United Republic of.