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Influence of argillaceous particles on the conditions for reinjection of cooled geothermal fluid

The project aimed to investigate the mechanisms and phenomena occurring during the reinjection of cooled formation water into the sandstone reservoir of the Madrid basin, and to devise ways to avoid very low or reduced injectivity into geothermal systems.

Since geothermal water usually contains salts and gases, it is usual to reinject the fluid after the heat has been extracted. Reinjection is often made into the same reservoir, at a certain distance from the production well, in order to maintain reservoir pressure and ensure the continuation of the geothermal water supply. The main problem with this process is that the reinjected water often contains fine particles. Studies carried out in various sedimentary basins, in particular France, have shown that, as the water is reinjected, these particles cause blockages in the pore spaces. Eventually the pore spaces lose their conductivity altogether, with the result that flow rates within the reservoir rapidly deteriorate. Studies have also shown that, even after decantation and filtration, a careful control of the particles in the fluid is necessary.

Reported by

Société de Prospection et d'Etudes Géothermiques
Place Honoré de Balzac 6 RES_OG_PCD 95101
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