Stability of CO2-brine immiscible displacement

► Characterization of CO2-brine primary drainage on basis of experimental data. ► Criteria for instable displacement in two-phase flow: mobility, capillarity, gravity. ► CO2-brine displacement is stabilized on experimental scale by capillary pressure. ► Upscaling to field scale-instable displacement on field scale possible. ► Gravity overrun dominates fingering pattern in gravity-dominated, instable system.