Perpustakaan Digital ITB

This study focuses on the continuous gas lift design for well “MESS-1” using a transient dynamic approach. A sensitivity analysis is conducted based on gathered data to evaluate the impact of various variables on fluid behavior within the wellbore. The main variables analyzed through transient dynamic modelling include the lift-gas injection rate, pressure, and tubing outer diameter (OD). The continuous gas lift system derived from steady-state modelling, serves as the basis for input into the transient dynamic model. This model will be evaluated based on day-to-day behavior over a 7 days period. The goal is to understand how these variables affect fluid behavior within the wellbore, providing insights that can enhance the efficiency and effectiveness of the gas lift design for well “MESS-1.” The optimum result from the transient dynamic model indicates an injection depth of 3000 ft MD using 2 7/8" tubing OD, with an injection pressure of 1200 psia and an injection rate of 1 MMSCF/day through 0.5” injection port. This configuration results in a more stable flow, with less flow pattern fluctuation and a dominant dispersed bubble flow pattern. Further optimization is possible by implementing other artificial lift methods, such as an Electric Submersible Pump (ESP), to provide even more stable flow and reduce the decline rate. However, it may result in a slightly lower day-to-day rate. This approach enables engineers to design gas-lift systems with greater precision and accurately predict the system's optimal range and fluctuations throughout its operational life.