#TITLE_ALTERNATIVE#

• Main Author: PARDAMEAN SAMOSIR (NIM 10104102), DANIEL
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/10162
• Institution: Institut Teknologi Bandung

Gas lift method is one of the artificial methods which are commonly applied in oil production fields. After certain period of time, oil production rate in production fields will decrease as the result of decreasing reservoir pressure. Gas lift method is used to reduce the pressure lost along tubing so that the oil can still be lifted to surface with the existing reservoir pressure. The fluctuation in compressor and the decreasing of reservoir pressure can cause instability in gas lift system. Reservoir pressure can not be controlled but it can be predicted. The compressor pressure can be controlled because compressor is installed on surface. The purpose of this final project is to analyze the effect of decreasing of reservoir pressure and fluctuation in compressor to stability of gas lift system. Fluid flow from compressor to injection point, the multiphase fluid flow in tubing, and the stability of gas lift method are being analyzed in this final project. Analysis of fluid flow from compressor to injection point produces a relation between reservoir pressure, compressor pressure, gas injection rate, and oil production rate. The equation of pressure lost with boundary value problems is obtained from multiphase fluid in tubing. This equation can be solved numerically using runge kutta orde 4 and shooting method. The numerical solution in the form of a relation between gas injection rate, oil production rate, and reservoir pressure is represented in a curve called Gas Lift Performance Curve. The stability of gas lift method in this final project is based on the criterion that is developed by Alhanati. The relation between compressor pressure, reservoir pressure, and oil production rate at stable condition is obtained from these three analyses. This relation can be used as a control mechanism in gas lift system to anticipate disturbance from compressor and reservoir to maintain optimum oil production.