Improving pressure-limited CO2 storage capacity in saline formations by means of brine extraction

•For regional-scale or greater deployment, pressure buildup in saline formations could significantly constrain dynamic CO2 storage capacity.•Brine extraction could be necessary to increase the CO2 storage capacity of saline formations.•A function is derived to estimate the brine extraction rate that could be necessary to achieve a target rate of CO2 injection for a given scenario.•At least part of a “Beyond Two-degree Celsius Scenario” goal could be achieved with a volume ratio of brine extraction to CO2 injection as low as 1:4.