OPTIMIZATION METHODS FOR ALLOCATION OF GAS LIFT INJECTION IN AN OIL FIELD

• Main Author: TAMAHALOHO (NIM. 22207008), EDDY
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/21864
• Institution: Institut Teknologi Bandung

In this study, the performance of an oil field with ten gas-lifted wells has been analyzed. The Equal Slope method from GLPC for each well was employed. Nodal System Analysis has been plotted with the inflow curve was straight line IPR curve and the outflow curves were the sensitivity parameter GLRtotal. From the intersection points we obtained the liquid flow rate for each GLRtotal. The Gas Lift Performance Curves (GLPC) were then can be plotted which showing the relationship between gas injection flow rate and liquid flow rate. Calculation of the gas lift allocation also has been done using the GAP software. <br /> <br /> <br /> The results show that if gas lift injected at 10 mmscf/d we will obtain an oil production rate of 16778 BOPD from the ES method, compared with 20255 BOPD calculated from GAP. Meanwhile, at a gas lift injection of 15 mmscf/d we obtained total oil flow rate of 17048 BOPD from the ES method, and 20385 BOPD from GAP. From both methods it is noticed that wells with higher PI received more gas lift injection. <br /> <br /> <br /> Economical analysis also included in this thesis, using NPV, IRR, and B/C as the key parameters. From the prediction result of oil flow rate for the next four years, we obtained that the gas lift injection of 20 mmscf/d give the most profitable NPV indicator, even though it is not far different from the result of 15 mmscf/d gas injection scenario.