GEOCHEMICAL STUDIES ON A LOW-TEMPERATURE GEOTHERMAL WELL

This paper presents the results from a study of the composition of waters and the structure of depositions formed by direct heating utilization of geothermal waters. First, the chemical composition of geothermal waters from a selected low-temperature well was determined by standard methods. The silica enthalpy mixing model was used to find out the source temperature of the hot water component. The water - minerals equilibrium was studied by using a simulation program. The scales formed due to corrosion and deposition, during geothermal water utilization, were XRD analysed in order to identify them. The corrosion resistance of carbon steel was estimated using gravimetric and electrochemical methods as: chronopotentiometry and polarization curves, at the temperatures of 20°C, respectively 80°C, in static and dynamic conditions.