Abstract
AbstractCrystallization of carbonates is a key process affecting the operation of geothermal facilities and aquifer heat storage systems. The crystals formed in an aquifer heat storage test in the Upper Jurassic carbonate aquifer were investigated at injection temperatures of $$65\,^{\circ }\hbox {C}$$65∘C to $$110\,^{\circ }\hbox {C}$$110∘C, with varying $$\hbox {CO}_{2}$$CO2 partial pressures, and varying Mg/Ca ratios. Water samples were directly filtrated, and analyzed by SEM/EDX. Complementary autoclave experiments were run. In the autoclave experiments with tap water, aragonite crystals dominated at all temperatures (45–110$$\,^{\circ }\hbox {C}$$∘C). In the autoclave experiments with ultra-pure water, calcite crystals dominated at the same temperatures. In the field test, mainly calcite crystals were found up to temperatures of $$90\,^{\circ }\hbox {C}$$90∘C. Only at very high temperatures of $$110\,^{\circ }\hbox {C}$$110∘C aragonite crystallization prevailed. $$\hbox {CO}_{2}$$CO2 partial pressure varied especially between injection and production stages. Mg/Ca ratio varied through all stages, and depended on the dissolution of the rock matrix. Together with the autoclave experiments, this study suggest that temperature and Mg/Ca ratio had no influence on the crystallization, and only supersaturation affected the $$\hbox {CaO}_{3}$$CaO3 polymorphs. We further assume that we produced initially injected crystals back during the following production stage. That results in the assumption that existing particles can maintain an equilibrium in the dispersion, and reduce precipitation on surfaces like pipes and heat exchangers.
Funder
Bayerisches Staatsministerium für Wirtschaft und Medien, Energie und Technologie
BWM Group
Publisher
Springer Science and Business Media LLC
Subject
Economic Geology,Geotechnical Engineering and Engineering Geology,Renewable Energy, Sustainability and the Environment
Reference45 articles.
1. Aggarwal PK, Gat JR, Froehlich KFO. Isotopes in the water cycle: past, present, and future of a developing science. Berlin: Springer; 2005.
2. Ahn J-W, Kim J-H, Park H-S, Kim J-A, Han C, Kim H. Synthesis of single phase aragonite precipitated calcium carbonate in $$\text{ Ca(OH) }_2\text{-Na }_{2}\text{ CO }_{3}\text{-NaOH }$$ reaction system. Kor J Chem Eng. 2005;22:852–6. https://doi.org/10.1007/BF02705664.
3. Andritsos N, Karabelas AJ. Calcium carbonate scaling in a plate heat exchanger in the presence of particles. Int J Heat Mass Transf. 2003;46(24):4613–27. https://doi.org/10.1016/S0017-9310(03)00308-9.
4. Appelo CAJ, Postma D. Geochemistry, groundwater and pollution. Amsterdam: A.A. Balkema Publishers; 2005.
5. Bartels J, Baumann T, Bohnsack D, Huber B, Schubert A, Steiner U, Ueckert M, Wenderoth F, Zosseder K. Forschungsvorhaben Hochtemperatur Aquiferspeicher Schlussbericht Phase 1. Tech. rep., Eine Kooperation der Aquasoil GmbH, Erdwerk GmbH und Technischen Universität München; 2015.
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