Surfactant Injection on Naturally Fractured Carbonate Reservoir: Simulation Modeling with Inverted 5-Spot Pattern

Abstrak

Study of Naturally Fractured Reservoir (NFR) in recent years began to be done, this is because the decrease of clastic reservoir reserves. NFR has unique characteristic that has a dual porosity and dual permeability system in its production mechanism. In NFR simulation modeling it is necessary to know parameter the quantities of Storage Capacitance Coefficient () which explains where the dominant fluid is contained in matrix or fractures and Interflow Porosity Coefficient (2) which explains how easily the matrix or fracture flows the fluid.
This research will held on naturally fractured carbonate reservoir with solution gas drive mechanism. Recovery Factor (RF) from this type of reservoir is very low due to the significant pressure drop in the reservoir system and in the presence of dual porosity and permeability increasingly its complexity. Therefore, as an effort to increase oil recovery, further study of Enhanced Oil Recovery (EOR) is required. Selection of EOR method to be applied in this model is by surfactant injection. Surfactant is an active agent that can decrease the inter facial tension between oil-water so that the capillary pressure in the pore narrowing area will decrease causing the residual oil can be displaced and produced. Modeling surfactant injection simulation in this case was performed using the CMG 2017 STARS Simulator with an inverted 5-spot pattern.
Simulation of surfactant injection as an enhanced oil recovery will result in increased recovery factor. Parameters required for increasing recovery are surfactant concentration, surfactant injection flow rate and surfactant injection scenario. The selection of the best scenario will be presented as an effort to increase the oil recovery.