Systematic Study of Geothermal Brine Reinjection for SaltPower Generation Purposes:Citric Acid as a Potential Iron Control Agent
| Autor: | Erik Gydesen Søgaard, Jacquelin E. Cobos |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0211 other engineering and technologies
02 engineering and technology Fluid-fluid interactions 010502 geochemistry & geophysics 01 natural sciences chemistry.chemical_compound Citric acid Brining 021108 energy Porosity Geothermal gradient 0105 earth and related environmental sciences Renewable Energy Sustainability and the Environment Chemistry SaltPower generation Geology Geotechnical Engineering and Engineering Geology Dilution Salinity Permeability (earth sciences) Hypersaline fluids Chemical engineering Geothermal brine Formation damage Porous medium Rock-fluid interactions |
| Zdroj: | Cobos, J E & Søgaard, E G 2021, ' Systematic Study of Geothermal Brine Reinjection for SaltPower Generation Purposes : Citric Acid as a Potential Iron Control Agent ', Geothermics, vol. 95, 102116 . https://doi.org/10.1016/j.geothermics.2021.102116 |
| DOI: | 10.1016/j.geothermics.2021.102116 |
| Popis: | Geothermal brines are concentrated, saline fluids that could be mixed with fresh water to produce “green energy”. By exploiting the large salinity gradient between those fluids, more energy could be harnessed from heat depleted geothermal brines. This study is an attempt to determine the feasibility of adding citric acid to a geothermal brine before dilution. The possible rock-fluid and fluid-fluid interactions that could take place upon reinjection are analyzed though isothermal titration calorimetry (ITC) and core flooding experiments. The results from the ITC experiments show that citric acid in the diluted geothermal brine dissolves iron bearing-carbonate cement. The direct implication of those dynamic interactions is an increment in the rock properties (porosity and permeability), which was also confirmed by coreflooding experiments. Formation damage is only observed when Sonderborg brine and diluted Sonderborg brine were injected into a Berea sandstone core plugs. Those results confirm that the precipitation of Fe(III) oxides inside the porous media could be avoided by the help of citric acid. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|