Simulating the Key Design Parameters of Oil Field Development

The Southwest Betara (SWB) field is located in the western area of the Jabung Block, South Sumatra Basin. The reservoir simulation study was done in this field to predict the reservoir performance, generate production forecast, and finally generate the optimum field of the development plan. To achieve these goals, integrated seismic interpretation, geological model, and reservoir engineering study has been conducted to create dynamic reservoir models. Several reservoir model realizations have been created according to the geological models. The model is validated with the available production history and reservoir pressure data. The PVT data have also been validated with more accurate oil and gas production data. To define optimum field development, sensitivities of the number of producing wells, and pressure maintenance to cumulative oil recovery were done. A total of three cases, base case-11 wells, case-1-18 wells, and case-218 wells plus 2 injectors, were run to optimize the future development of the SWB field. Results revealed that gas production rate in case-1 higher than the other cases. Because of in case-1 the reservoir pressure drops significantly under bubble point pressure. While the cumulative oil production from case-2 is higher than others. On average, the reservoir pressure drops by 800psia after 5 years of production in case-1. In water injection case (case-2), the reservoir pressure drop by 1200psia, it means that water injection can be used to maintain reservoir pressure in the SWB field. An estimated 14.56% oil recovery factor is generated from a reservoir simulation model in base case, 17.8 % from case-1, and 20.69 % from case-2.