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The typical standard geothermal well slotted liner is a 7", research on big hole slotted liner to increase steam production in geothermal fields. In the previous study the potential of geothermal field was 380 Mwe, while currently it has been produced at 39.79 Mwe, so that the field geothermal is feasible to be developed again. The current conditions there are 7 production wells with normal hole (7 "liners) that have been proven to produce continuously in developing this production will be simulated using the big-hole size slotted liner, starting at 8 5/8", 9 5/8 ", 10 ¾ ", 11 ¾", 13 3/8 "16", 20 ". With proven reservoir condition data, the geothermal field is feasible for production studies using big holes. The main parameters include Temperature, Preassure, mass flow and steam quality. The conceptual model is an interpretation of the condition of the reservoir so that the reservoir conditions in the well can be identified as data for the study. WellSim Simulator is used to predict pressure loss in the hole and bottom surface, and vice versa. The output is the pressure, mass flow rate, temperature, dryness and enthalpy of the wellhead so that various casing sizes can be simulated with the condition of the reservoir. The optimal size of the production liner developed in the geothermal field is 9 5/8 ".