Investigating the enhanced oil recovery leads to optimal production, protection and reduction of lateral impacts. Low salinity water injection (LSWI) is one of the significantly improved oil recovery (IOR) techniques for changing the amount of wettability in the carbonate fractured reservoirs. The utilization of this methodology in terms of high efficiency in displacing light crude oils to the medium-gravity crude oils, water sources availability and its sustainability for pushing the oil which

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... leads to appropriate economic occasions, are being compared with other IOR/EOR techniques. In this study, the best injection modelling pattern is based on the highest rate of recovery factor. Comparison of "high and low salinity water injection method" with "pure water injection method" is performed in an oil reservoir. Overall, analyzing the sensitivity on the high and low salinity according to the moderately low recovery factor of high and low salinity among the injection scenarios illustrates the low sensitivity of this parameter on a fractured carbonate reservoir. By reviewing different scenarios, it could be demonstrated that if the water injection could be applied to the reservoir from the preliminary times of production, the recovery factor rate would be increased. Thereby, higher appropriate efficiency and better supplement have resulted. Pure water injection has a high recovery factor than salty water injection. By the way, these two methods have little differences in calculating recovery methods. Besides, this parameter is significantly depended on wellhead equipment properties, safety factor and economic issues (water production).