Effect of Temperature and Acidification on Reinjection of Geothermal Water into Sandstone Geothermal Reservoirs: Laboratory Study

Geothermal reinjection is a new method of geothermal development which can maintain regional reservoir pressure, and it conducive to the sustainable utilization heat. However, blockage has always been problem that restricts utilization, causing reservoirs, especially attenuation sandstone reservoirs. Considering an example typical in Binzhou, this study, situ fluids borehole cores were collected conduct automatic rotary reactor experiments under different temperature acidification conditions laboratory studies. The chemical compositions core samples before after experiment compared. results show both acid have significant effects on water–rock interaction. effect mainly shown mineral solubility, while increased dissolution calcite feldspar minerals. Compared with high (65 °C) conditions, precipitation at low (45 largely reduced, but larger total volume changes, due formation montmorillonite. Therefore, from studies, recommended preform using low-temperature fluid, without adding acids.