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 this article, we look to explain some of the common enhanced or secondary/tertiary methods of oil recovery.
With oil hitting new highs every day, it is clear the cost benefit of utilizing technology to get at extra production makes sense. When oil was in the $10-20 range, the incremental cost of some enhanced oil recovery methods did not make economic sense.
One of the most common secondary recovery methods is a waterflood. Essentially, a waterflood is a reintroduction of water into the formation to create a drive to push more oil towards the wellbore. To increase the efficiency of a waterflood, new methods utilize Alkaline-Surfactant-Polymer floods and some explorers are introducing microbes into the wellbore to increase the sweep efficiency of the flood, both methods...
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