About CCS

Injection & storage

Injecting the CO2

Once on site, CO2 may need to have residue removed via suction scrubbers. Then it is compressed to supercritical state in order to be stored. At the time of site characterisation, the injectivity of the reservoir is determined. The CO2 is pumped into the reservoir at a pressure greater that the reservoir fluid pressure. The pressure must be enough to enable the CO2 to enter the formation, but not so great as to fracture the formation.

CO2 will be injected at depths below 0.8 km (2600 feet ). CO2 increases in density with depth and becomes a supercritical fluid below 0.8 km. Supercritical fluids take up much less space, as shown in this figure, and diffuse better than either gases or ordinary liquids through the tiny pore spaces in storage rocks. The blue numbers in this figure show the volume of CO2 at each depth compared to a volume of 100 at the surface.

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