The decreasing number of discoveries of new large hydrocarbon reservoirs as well as the significant technical progress promote the use of enhanced oil recovery methods. One of the most popular is the sequestration of carbon dioxide in matured or depleted hydrocarbon reservoirs. It allows to achieve the synergistic effect of increased crude oil production and underground sequestration of injected gas. In this paper the model of development of the multi horizontal, oil & gas field using multilateral wells technology connected with simultaneously implementation of the EOR-CO2 methods was presented. Based on the performed model, ten-year productions forecasts were made, which results unambiguously confirmed the significant efficiency of the applied technological solutions with indication of the interesting prospects of their implementation in similar reservoirs.