COMPOSITION OF NANOFLUID FOR ENHANCING CARBON DIOXIDE DIFFUSION

Abstract

The utility model relates to carbon dioxide capture and geological storage (CCS) technologies and can be used to enhance CO2 diffusion in highly mineralized brines. A nanofluid composition is proposed containing, by weight: surface-modified carbon nanotubes - 0.01; sodium chloride - 5.5; water - the rest. The nanofluid is obtained by mechanical mixing and ultrasonic homogenization. The technical result consists in increasing the CO2 diffusion coefficient from approximately 1.9×10-9 to 3.1×10-9 m2 / s under reservoir conditions (9.3 MPa, 40°C), which corresponds to an increase in diffusion efficiency by approximately 60%. The composition ensures dispersion stability and can be used in the underground storage of CO2 and the injection of carbonated water.