In which of the following case workover rig or mobile rig is not used?

In which of the following case workover rig or mobile rig is not used? Correct Answer CO2 flooding

For CO2 flooding workover rig or mobile rig is not used. gas-injection EOR projects in operation today use CO2 as the injected gas. It is an enhanced oil recovery (EOR) method in which carbon dioxide (CO2) is injected into a reservoir to increase production by reducing oil viscosity and providing a miscible or partially miscible displacement of the oil in oil and gas upstream industry.
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