PERFORMANCE ANALYSIS OF WATER INJECTION NETWORK IN RIAU PROVINCE OIL FIELD

• Main Author: Aldila, Migel
• Format: Theses
• Language: Indonesia
• Subjects: Teknik kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/81231
• Institution: Institut Teknologi Bandung

The oil fields in Riau contribute 24% to the overall oil production in Indonesia. The waste generated from oil wells predominantly consists of produced water, which accounts for 98% of the total liquid output. Injecting the produced water back into the earth through injection wells effectively manages this issue. This study examines various factors affecting the flow rate of the produced water injection. By gaining insight into these factors, the water injection system can be improved to handle the excess produced water more efficiently. ASPEN HYSYS software was utilized to conduct modeling and simulation in a steady state. Two types of injection system network models were developed: the prototype and the existing models. The prototype model comprised seven injection wells, an injection pump, and a control valve positioned ahead of the pump. Among the variables investigated in this study are control valve opening, header pipe diameter, control valve diameter, number of injection wells, and injection well placement. The existing injection system has a 12-inch diameter control valve and a 16-inch diameter header pipe. Simulation results of the prototype model revealed that the opening of the control valve is the most significant factor contributing to the injection flow rate. The larger the control valve opening, the higher the injection water flow rate. At 10% opening, the valve delivered 92,680 barrels per day to the wellhead at the minimum pressure of 850 psig and 79,125 barrels per day at the maximum pressure of 1,000 psig. The injection water flow rate was from 83,366 to 96,830 barrels per day when the valve was fully opened. However, since the existing model has been operated at a fully opened control valve, other methods were implemented to increase the injection flow rate. These include activating the inactive injection wells and selecting the location of an additional injection well close to the pump. Simulation results demonstrated that these measures boosted the injection flow rate from 86,606 barrels per day to 87,355 barrels per day, or an increase of approximately 1%.