Abstarct: Naturally fractured reservoirs compose a significant part of world’s hydrocarbon reserves, and oil production in these reservoirs is one of the highest challenges in oil industry. Low viscous fluids such as gasses or supercritical fluids are commonly used to enhance oil recovery. One of the important issues in oil and gas reservoirs are mobilization of residual oil in porous media, especially in water invaded zone, that is mainly achieved by EOR methods. In this project some applicable EOR methods by ECLIPSE software are simulated to extract entrapped oil in water invaded zone in one of the Iranian fractured reservoirs. In this research, initially gridding is made by FLOGRID software, then with using regression analysis in PVTi software, simulated reservoir fluid properties that shows a good agreement with experimental results. Maximum and minimum relative error with values of 5.37×10-2 and 11.54 respectively is related to the saturation pressure and dissolved gas oil ratio. In this research, alternating water and gas injection, simultaneously alternating water and gas injection, foam flooding and surfactant-polymer flooding methods are all investigated by ECLIPSE software in order to compare the oil recovery factor in water invaded zone, each of methods is baxsed on specific mechanism. Restoration of reservoir energy involves the frequently injection of gas and water to support reservoir pressure and also to provide a sweeping mechanism. Foam flooding increased oil recovery because of the alleviate channeling, increasing pressure and decreasing mobility of injected fluid, and surfactant-polymer flooding enhance the recovery by increasing the spontaneous imbibitions and lowering IFT. The results from simulation shows that the foam injection has the best recovery effect to produce oil in water invaded zones.