Interaction of Silica Glass Solubility and Metal Corrosion Under Supercritical Condition

Abstract

The experiment to estimate the interaction of dissolution behavior of silica glass and iron plate corrosion under supercritical condition (400-500 degree C, 40-96MPa) was carried out. Firstly, the dissolution rate of silica glass increased with pressure and temperature. But in the case of same pressure (60MPa), the Si concentration of fluid was higher at lower temperature due to higher fluid density. Secondary, in the case of the test with iron, the silica dissolution rate increased. But Si concentration was almost same. Fe concentration is higher than the case without iron. And at the surface of iron plate, fayalite (Fe2SiO4) and magnetite (Fe3O4) are precipitated. Then the increasing of silica dissolution was due to consuming of aqueous silica to precipitate fayalite and this suggest that the metal casing has possibility influence the reservoir rock dissolution.