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Abstract
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Gas injection, especially in miscibility, is considered to be one of the most optimal methods ofincreasing extraction from oil reservoirs. The minimum miscibility pressure is considered animportant parameter in gas miscible injection processes, its accurate determination along withthe choice of the type and composition of injection fluid percentage in the design of injectionfacilities as well as the investment perspective of various projects is very vital. The methodpresented in this project to estimate the minimum miscibility pressure (MMP) is based on theequation of state of Pc-Saft, whose accuracy is better than the common calculation methods forthis estimation. This method includes a fast and powerful algorithm in such a way that itcalculates the minimum miscibility pressure with a low percentage of error due to the effect ofthe pore volume by changing the different percentages of oil constituents as well as the amountof injected gas. The dimensionless function of the tangent plane distance (TPD) is used in theenvironment of reduced variables to calculate the composition of phases. whose main advantageis the presence of only one minimum in the TPD function. In this study, for more accuracy and toapproach the conditions of experiments and equations, the effect of the Pores volume has also
been considered and new equations have been created. Many previous studies have beenconducted on estimating the minimum miscibility pressure without considering the pore volume.But according to the equations obtained in this research, it can be seen that considering thischaracteristic of reservoirs can bring our results to a more accurate pressure
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