#TITLE_ALTERNATIVE#

• Main Author: FIRSTA BHAYANGKARI (NIM : 12214095), AGATHA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25094
• Institution: Institut Teknologi Bandung

In an effort to increase oil recovery, water flooding method is commonly applied as primary recovery with a mechanism of increasing macroscopic sweep efficiency of the reservoir. Similiarly, gas injection method is often applied to improve the microscopic sweep efficiency and reduce the oil-gas interfacial tension, especially for high viscosity oil reservoirs. However, the application of both methods individually has several disadvantages, among which are rapid increase of watercut in water flooding method and the unfavourable mobility ratio in gas injection due to large viscosity difference between the injected gas and the reservoir oil. To overcome these problems while still get the benefits from both water flooding and gas injection method, water alternating gas injection method is being introduced. <br /> <br /> The application of water alternating gas injection method on high viscosity oil is affected by various factors. Using a reservoir simulator, sensitivity analysis on increasing oil recovery factor was conducted for several technical parameters, such as viscosity, density, injection rate, injection time, and injection pressure, followed by analysis using design of experiment method. The results show that viscosity is a very influential parameter to water alternating gas injection, regardless of the applied operating condition. Comparison of water flooding, gas injection, and water alternating gas injection method is then conducted to the value of oil recovery factor, oil production rate, and watercut. Water alternating gas injection method gives the biggest oil recovery factor of 28.02%, followed by water flooding and gas injection method that gives oil recovery factor of 25.13% and 12.3% respectively. In keeping the decrease of oil production rate and the increase of watercut, water alternating gas method also shows superiority compared with the other two methods.