At the end of 2004, the remaining oil reserves in Croatian oil fields amounted to 8.5 million m3 and that together with high oil prices on the market represents a good base for the implementation of enhanced oil recovery methods.

After the conducted laboratory tests and simulation studies of the carbon dioxide injection process, the Ivanić oil field was chosen as the first candidate for the application of this EOR method. In order to rebuild the Gamma 2/4 reservoir pressure before the pilot project, injection of water started in 2001. The WAG CO2 process is being conducted through five cycles derived from simulation studies. After building pilot project facilities on the Iva-28 well location, the first cycle of carbon dioxide injection started in November 2003 and finished in May 2004. The next stage of the first cycle was the injection of water until November 2004. The second cycle of carbon dioxide injection started in November 2004, and finished in June this year. The main goal of this paper is to present two-year results of the CO2 WAG process, and on a broader level the knowledge accumulated in that period.

Analytical and synthetic methods of pilot project results give us information which has been tooled by inductive and deductive methods for improved knowledge and a higher level of intellectual capital. In the course of 5 WAG cycles on the production oil wells IVA-11 and 19, 76.500 m3 of oil will be produced. Oil production during the first cycle was 1900 m3, which is a good base for continuing further pilot project cycles (5 alternating CO2 and water injection cycles).

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