Mineral precipitation in the test of hot spring ecogene system

Abstract

Material and precipitation test was carried out at Otari test field using the fluid of OT-2 well for hot spring ecogene system. Fluid temperature was 70°:C, pH was about 7 with high T-HCO₃, Cl and SO₄ concentration. In hot spring water path, copper change to chalcopyrite and iron react with CO₂. And aragonite, calcite and silica precipitated on heat exchanger. However in cooling water path, aragonite precipitated especially higher temperature area due to super-saturation by heating