In the world oil business practice the mitigation of the natural decline effect in the production of oil and gas is more prevalent as well as revitalization of an old and partially depleted reservoirs.
A method that has the largest application is the injection of carbon dioxide into oil reservoirs. INA's EOR project will be the first case of the application of tertiary methods in Croatia.
EOR (Enhanced Oil Recovery) is one of the INA's most important investment project in the continental Croatia. The project objective is the extraction of additional hydrocarbon on the Žutica and Ivanić oil field, on register units Ivanić Grad, Šarampov, Posavski Bregi, Topolje and Hrastilnica. The project involves the application of the one of the so-called tertiary methods of enhanced oil recovery: alternating injection of carbon dioxide and water in partially depleted oil reservoirs, which will increase the pressure in the reservoir. The project has also an environmental dimension, as it imprinted significant amounts of CO2 into the underground thusreducing emissions into the air. Planned project envisages the construction of system of gas pipelines, power line and signal cables for underground injection of CO2 in the soil layers on the existing production wells. Within the project, apart from the existing 85 kilometers long pipeline from the INA Molve fields to the Ivanić and Žutica INA's fields, , another 56 kilometers of new pipeline as well as two compressor stations will be built. Contracts for the EOR project were signed in May 2012.