Waterflooding Development Prediction in Carbonate Reservoir at Field X using Reservoir Simulation

Abstract

Field X consist of a carbonate reservoir, producing since April 2014 with only 2 existing wells present, which is well NF-01 and NF-02. Production history of the field was performed from year 2014 until 2016. The original oil in place of Field X is 9.204 MMSTB (volumetric) and 9.0308 MMSTB (simulation). A method of optimizing Field X is Waterflooding after primary recovery has been done. In this study, the software used for the development of Field ‘X’ is Computer Modeling Group (CMG) IMEX Black Oil, by applying waterflooding as a method of optimizing the field, the optimization can be determined based on the consideration of various development scenarios. Reservoir simulation process consists of several steps which are; data preparation, model and grid construction, initialisation, history matching and prediction forecast. All the data up until history matching was given and the focus of this paper is to evaluate and predict several scenarios. The period of development is done for 19 years which is until December 2035. Several scenarios predicted were In-fill, conversion of wells, peripheral, 5-spot patterns and pilot studies. As the prediction developments were conducted, recovery from each scenario varies. These scenarios are then compared to be able to find the optimum result. After simulating several scenarios of as follows; infill-18 wells, infill-26 wells, infill-horizontal wells, covert all non-producing wells, peripheral wells, invert and normal 5-spot wells and comparing the recovery factor, it can be said that waterflooding implementation was insignificant as there were only a slight increase in recovery factor. The optimum scenario from waterflooding implementation is the peripheral pattern with a recovery factor of 38.17%.