Enhanced Oil Recovery, Secondary, and Tertiary Recovery

Did you know that much of the oil in the ground is still present after primary recovery? In the king's english that means there is still a lot of oil left in a well even after 10 years of pumping. The reason oil production slows is that the natural drive that once pushed oil aggressively towards the wellbore has subsided. Normally, the natural drive is either water or gas in the formation. In