Can you explain the difference between primary, secondary, and tertiary recovery methods in oil production?

Primary recovery refers to the natural flow of oil to the surface due to reservoir pressure.

Secondary recovery involves injecting water or gas into the reservoir to increase pressure and push the oil toward production wells.

Tertiary recovery, also known as enhanced oil recovery (EOR), involves injecting specialized chemicals, steam, or CO2 to improve the flow of oil and increase recovery rates.