MODELING OF SCALE FORMATION AND CORROSION FROM GEOTHERMAL WATER

Simulation of particle size evolution and of scale formation and corro sion along the flow path is of the greatest importance for data interp retation as well as for engineering applications (eg minimisation of t he scale formation) in geothermal and hot water plants. An equilibrium simulation algorithm and a computer program for calcite scale formati on in a CaCO3-H2O-CO2 system has been developed using the Davies and F itter activity calculation methods. An equilibrium simulation algorith m and a computer program for CaCO3, CaSO4, BaSO4, SrSO4 scale formatio n in a Na-K-Mg-Ca-H-Ba-Sr-Cl-Br-SO4-OH-HCO3-CO3-CO2-H2O system are als o constructed using the Davies and the Fitter activity calculation met hods. The program determines the Langelier and Ryznar saturation index es too, which are useful for the description of the scaling and corros ion characteristics in a solution. An equilibrium simulation algorithm and a computer program for the determination of the bubble point and of the partial pressure profiles of the gases CO2, CH4 and N-2 between the,bubble point depth and the well head in a geothermal well are con structed. (C) 1997 Elsevier Science Ltd.