Simulation of Slim Tube Test for Gas Enriched with NGL in the Reservoir Oil in One of the Southern Fields of Iran

One of the methods of increasing oil production is miscible gas injection. The most important parameter in the design of miscible injection method is to determine and calculate the minimum miscibility pressure. In order to obtain the best oil production, the injection operation pressure or the range of miscibility pressure should be at above. Moreover, in this method, the calculation and prediction of the minimum miscibility pressure is a very important parameter. In this study, to simulate the process of gas injection in to the reservoir and to investigate the condition of miscibility, the available laboratory information and model of slim tube were used in Petrel (Eclipse 300) software in a single porosity model. After modeling fluid properties using Winprop Software, the appropriate outputs were made to be used with Eclipse 300 Simulator. Then by simulating the injection of fluids with different composition in the reservoir fluid, the MMP value was calculated for each of the modes. In order to do that, the gas was combined with different proportion of gas condensate, and by considering the reservoir pressure, the optimum injection composition in the reservoir oil was determined. Finally. the sensitivity analysis was made on the parameters which influence the gas injection process.