The "PF-A-I" - an undersaturated oil reservoir located in Hungary- is more than 50 years old. It was discovered in the late 1950’ years and put in production in 1960. The reservoir produced by depletion, then by CO2 injection, by WAG injection, afterwards by water injection and finally by "depletion" again.
The case study shows all production stages in detail – the most important data, what were the results of different type of injections, how saturations, pressure, recovery factor changed followed by the comparison of planned injection and production rates with facts by diagrams and maps.
It shows why the CO2 injection was more important than the experts thought and which type of injection was the most effective and gave the most extra oil.