The Investigation of Feasibility Study of Water/Gas-Based Enhanced Oil Recovery (EOR) Methods in one of the Bangestan Reservoirs of Oil Fields in the South of the Country

Immediately after the exploration, with drilling of production wells the production in oil reservoirs is commenced by natural reservoir forces, but the reservoir pressure gradually declines, and throughout the well exploitation life some methods are needed to maintain the reservoir pressure. Eventually, if the residual oil is not recoverable by the reservoir pressure maintenance methods, the residual oil in the reservoir would be minimized by changing the reservoir properties, using the specific EOR methods. The water/gas-based methods are common in the EOR processes. In the industrial studies on candidate base reservoirs, usually the function of each EOR method is explained separately and the technical and economic studies of the methods with the approach of the short-term and long-term investigation is not performed concurrently. In this research, at first, the most appropriate EOR methods are determined using primary screening, and their dynamic simulations are performed on the initialized model. Then, the calculations of economic model are performed according to the production and injection profiles in order to obtain the technically and economically optimum method. Results show that the immiscible gas injection method has a greater NPV than the water-based method by increasing the injection time and changing the production control parameter.