Simulasi Reservoir Heavy Oil dengan Multistaging Development Modifikasi Inverted 5-Spot Kombinasi Cyclic Steam Stimulation (CSS) dan Steamflooding

Abstract

Oil Field development with a heavy oil reservoir is needed by obtaining an advanced stage (Enhanched Oil Recovery / EOR). Steam Injection applied to the reservoir to increase heavy oil recovery. Thermal Enhanced Oil Recovery (Thermal EOR) is one of the methods in obtaining advanced heavy oil recovery. Generally, thermal injection is carried out to reduce the viscosity which has an effect on the mobility ratio. There are various mechanisms in thermal injection and one of them is the method of injection of steam into a reservoir. The purpose of this research is to provide a comparison between the performance of steamflooding and the combination of CSS and steamflooding using multistaging pattern development. In this reservoir modeling a comparison of 2 scenarios will be made where the first scenario is steamflooding and the second scenario is a combination of steamflooding with Cyclic Steam Stimulation (CSS). This modeling using CMG STARS 2015 software because it is one of the CMG parts for thermal injection. This modeling is carried out to plan fully, so that there is no history matching process to production data. Both of these methods are compared with basecase inverted 5-spot steamflooding without development. It is intended to see a comparison of the conditions of development and without development with the same complex. The final result of this reservoir simulation is comparing the steamflooding scenario and the combined scenario with the effect of the CSS stimulation method. The best scenario is obtained from a scenario that has high RF results and low CSOR. The steamflooding scenario produces RF 71.86%, Np 265645 bbl, and CSOR 8.268. The CSS and Steamflooding scenario produces RF 72.38%, Np 267555 bbl and CSOR 8.029. This multistaging pattern scenario succeeded in raising RF with a 5-spot basecase scenario for 25 years that only produced RF 16.88%, Np 62391.3 bbl, and CSOR 10.194.