What makes a reservoir a good CO₂ candidate?
The following are initial screening parameters used to identify possible candidates:
• Good waterflood recovery > 25%
• Depth > 2500ft
• API > 25
• Residual Oil > 25%
• No significant gas cap

What makes an economic CO₂ Flood?
There are many factors that will affect the economic viability of a CO₂ flood. The following will have significant impact:
• Oil price
• Proximity to source of pure (>95%) CO₂
• Existing facilities and good wellbore integrity
• Optimal well spacing
• Reservoir sweep efficiency

How does it work?
CO₂ is pumped under high pressure into the reservoir through injection wells, creating a CO₂ flood bank.This CO₂ bank mixes with the oil remaining in the reservoir, causing it to become more mobile. The CO₂ acts as both a solvent by reducing oil viscosity and a swelling agent. As more oil is encountered, an oil bank forms and is pushed ahead of the CO₂ flood bank toward producing wells. The producing wells pump the oil to the surface where the CO₂ is separated from the oil and reinjected back underground.