Abstract: A method for sequestering CO2 in a subterranean formation and a method for sequestering CO2 in a subterranean formation during an enhanced oil recovery treatment include preparing a solution comprising CO2 and from 0.01% by weight (wt. %) to 10 wt. % of a CO2 soluble alkoxylate surfactant based on the total weight of CO2, processing the solution through a dispersing unit in fluid communication with an injection well, and injecting the dispersion into the injection well of the formation, thereby sequestering CO2 in the formation. The method for sequestering CO2 in a subterranean formation during an enhanced oil recovery treatment includes introducing an enhanced oil recovery treatment to the formation. A system for sequestering CO2 in a formation includes an injection well in fluid communication with a formation, an injection unit, and a dispersing unit that is in fluid communication with the injection unit and the injection well.

Abstract: Carbon dioxide may be stored by mineralization. An example method thereof may include: providing a first solution including a first aqueous fluid having dispersed therein a metal salt and a metal catalyst; dispersing carbon dioxide gas in a second solution including a second aqueous fluid, wherein the carbon dioxide gas forms dissolved carbon dioxide; introducing an electrical current to the second solution; generating, using the electrical current, nanobubble carbon dioxide; combining at least a portion of the first solution and at least a portion of the second solution to form a combined solution; and generating mineralized carbon dioxide from the dissolved carbon dioxide and the nanobubble carbon dioxide, wherein the generating at least partially comprises catalytically reacting, using the metal catalyst, the metal salt and one or more of the dissolved carbon dioxide and the nanobubble carbon dioxide, thereby forming the mineralized carbon dioxide.

Abstract: A device includes a microfluidic cell including a substrate and metal electrodes disposed on the substrate, a glass window disposed over the substrate, a current-voltage analyzer connected to the metal electrodes, and an inlet and an outlet in fluid communication with the microfluidic cell. A method of fabricating the device includes photolithographically exposing site for the metal electrodes utilizing a photoresist, depositing the metal electrodes on the substrate, and photolithographically patterning the substrate. A method of measuring pore throat size changes and oil mobilization includes connecting a current-voltage analyzer to a microfluidic cell and sweeping a current through the microfluidic cell via the current-voltage analyzer.

Abstract: Mineralizing carbon dioxide for storage may occur in a wellbore. For example, a method of mineralizing carbon dioxide may include: introducing, through a first wellbore to a subterranean formation, a first solution including a metal salt and a metal catalyst; introducing a second solution including a brine, wherein the second solution has nanobubble carbon dioxide at least partially dispersed therein, and wherein the second solution is introduced after introduction of the first solution; injecting carbon dioxide gas thereby at least partially dispersing the carbon dioxide gas in the first solution, thereby forming dissolved carbon dioxide; generating mineralized carbon dioxide from the dissolved carbon dioxide, wherein the generating includes catalytically reacting the metal salt and the dissolved carbon dioxide using the metal catalyst, thereby forming the mineralized carbon dioxide; and depositing the mineralized carbon dioxide within the subterranean formation.