Chemical study of a low temperature geothermal fluid in a triassic sandstone aquifer: Scaling potential and fluid treatment (Melleray, France)
| Autor: | Isabelle Czernichowski-Lauriol, François-David Vuataz, Sylvie Detoc, Christian Fouillac |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
geography
geography.geographical_feature_category Petroleum engineering Renewable Energy Sustainability and the Environment business.industry Geothermal energy Geology Aquifer Geotechnical Engineering and Engineering Geology law.invention Clogging Pilot plant Decantation law Wellhead business Geothermal gradient Filtration |
| Zdroj: | Geothermics. 18:313-320 |
| ISSN: | 0375-6505 |
| Popis: | The Triassic sandstone aquifers offer a promising geothermal potential for space heating systems in western Europe and particularly in the Paris Basin. However severe reinjection problems at the Melleray geothermal exploitation, near Orleans, have delayed the use of such aquifers in France. A fluid with a TDS of 35g/1 at 72°C tapped by the production well of Melleray has been carefully studied. The reinjection problems are mainly due to gas bubbles and solid particles clogging the pores of the sandstones. These particles originate either from the formation or from chemical reactions in the geothermal loop. More than 50% of the total solid load of particles collected at the wellhead are between 0.1 and 0.01μUm in size, and, for a pumping rate of 150m3/h, 17kg of residues enter the heating plant daily. In order to establish a fluid treatment with a view to reinjectiion, a small-scale pilot plant has been designed. This pilot plant enables several physical and chemical fluid treatment procedures to be tested, including degassing, oxidation, decantation, filtration and injection of scaling and/or corrosion inhibitors. Degassing of the fluid looks particularly favorable to avoid rapid clogging by gas bubbles. However this process may induce carbonate scaling, especially as the geothermal fluid at depth is in chemical equilibrium with respect to calcite. In the case of fluid degassing, the scaling potential has been evaluated, using the computer code TPDEGAZ. It is shown that an appropriate choice of exploitation scheme combined with the use of crystal growth inhibitors would allow exploitation of the Melleray geothermal resource. |
| Databáze: | OpenAIRE |
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