S.M. Seyyedsar - Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O. Box ۱۱۳۶۵-۹۴۶۵, Tehran, Iran
M. Assareh - Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O. Box ۱۱۳۶۵-۹۴۶۵, Tehran, Iran
C. Ghotbi - Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O. Box ۱۱۳۶۵-۹۴۶۵, Tehran, Iran

Multicontact miscible displacement occurs in systems when either the initial tie line or the injection tie line is a critical tie line. The oil recovery decreases sharply, with the system pressure, below the minimum miscibility pressure (MMP). Therefore the estimation of MMP is an important issue in reservoir fluid phase behavior modeling for the reservoirs with miscible gas injection. There are several approaches for MMP estimation.In this work, Multiple Contact Test (thermodynamic modeling) and Compositional Simulation (fluid flow modeling) are compared to experimental data for their capability to estimate MMP. Phase behavior and MMP calculation are performed on several oil samples from published data and the advantages and disadvantages of each method are discussed. For most of the cases, predictions of the Multiple Contact Test results are in better agreement with the experimental PVT data. In addition there is no need for pseudo-component generation and detailed system information can be preserved for both reservoir fluid and injected gas.

Multiple Contact Displacement, Compositional Simulation, Minimum Miscibility Pressure, PVT, Equation of state