Design of Optimum Pontential Determining Ions (PDI) Composition of Low Salinity Water Injection In Sandstone Reservoir For I Structure At S Field

• Main Author: Adrian Pratama, Egi
• Format: Final Project
• Language: Indonesia
• Subjects: Pertambangan dan operasi berkaitan
• Online Access: https://digilib.itb.ac.id/gdl/view/45268
• Institution: Institut Teknologi Bandung

Natural production as a primary recovery can lift only 5% to 15% of initial oil in place. Many Industries try to enhance the oil recovery of their field through some Enhanced Oil Recovery (EOR) method, and still economic consideration delays the execution waiting for the oil price becomes more stable and high enough. Low Salinity Water Injection (LSWI) as the one of novel method in EOR becomes more attractive around researchers and industries in last decade due to its relatively low cost, simple design, and low enviromental impact. An Incremental oil recovery by using LSWI method has been proven through coreflood experimentals and field pilot projects, it is observed an addition recovery about 10% to 20% (Dang et al.,2015). For these reasons, more mature fields in Indonesia potentially are able to extent their economic life even for oil price is low relatively. The design of Low Salinity Water Injection is conducted to “S” field in Indonesia for potential forecasting of this method. In this case, Potential Determining Ions (PDI) composition of injection water will be designed from initial Formation Water (FW) such as 2x diluted of FW (SW1), 10x diluted of FW (SW2) and proposed design from authors (SW3 & SW4). The basic mechanism of Low Salinity Water Injection in microscopic scale which occurs in the reservoir will be presented to lead the basic idea of including the mechanism to numerical reservoir simulation. Reservoir simulation is executed by using CMG GEMTM to perform compositional fluid model combining with Low Salinity Water Injection Process Wizard. According to simuation results, SW2 (10x diluted of FW) is the optimum design of injection water type to create optimum reduction of oil residual saturation and oil recovery. Increasing of formation water (FW) diluting to design Low Salinity Water Injection will reduce oil residual saturation effectively. Lowering monovalent cation only to design Low Salinity Water Injection will reduce oil residual saturation more effective than before lowering but doesn’t provide more effective of sweeping ability than before lowering. Then, adding monovalent cation only to less salinity of LSWI doesn’t provide higher oil recovery.