ABSTRACT
The aim of this study is to investigate the perspectives for application different gas EOR methods in the “Sm” oil reservoirof the “X” oil-gas field in the southeastern part of the Pannonian Basin, Republic of Serbia. Special attention is given to the Water Alternating Gas (WAG) and Simultaneous Water Alternating Gas (SWAG) EOR techniques. Studied reservoir is a massive one, with a light oil in place. Reservoir rocks are the sandstones, alevrolites and the cap rocks are the clays and marls. Study is based on the hydrodynamic modeling of the oil displacement in case of water, gas (CO2, nitrogen, saturated gas) and water-gas mixtures injection. It includes the creation, initialization and calculation of the 3D compositional hydrodynamic model using the tNavigator 18.2 software. The model is created as a segment of the initial geological model of the reservoir. It is initialized with the PVT model of reservoir fluids and the petrophysical model of the reservoir rocks. Based on the simulation results and evaluation of the main development parameters (cumulative oil production and oil recovery factor on the first place), it is shown, that the “Sm” reservoir is perspective for the application of the gas EOR methodsin general. The best EOR cases with the maximum oil recovery (up to 46%, comparing with 25% without injection) are continuous gas injection, SWAG and WAG techniques with the use of are CO2 and saturated petroleum gas.
