ABSTRACT
Gas injection under gravity force is the significant oil recovery method known as Gas Assisted Gravity Drainage (GAGD). In this investigation, effect of three different configurations of fracture sides on recovery factor were examined. In the first configuration, the top and bottom parts of fractures were unblocked and open to injection and production. In the second configuration, the lower parts of fractures were blocked and direct production were just from the matrix. In the third configuration, the top and bottom parts of fractures were closed and only matrix directly contributed in injection and production. In this configuration, fractures contributed in injection and production only by perforated surface between matrix and fracture. Results showed that in the open fracture model, gas invaded into fractures and early gas breakthrough occurred and this was the reason of lower recovery factor at model with unblocked fracture sides. Also, higher final recovery achieved in the close fracture model. Therefore, in gas assisted gravity drainage process recovery improved if gas could not invade directly into fractures and oil could not produce from fractures.
