Perpustakaan Digital ITB

This study aims to optimize the gas lift injection design to improve the performance of well X. The steps taken include evaluating the current gas lift system, determining the gas lift deepening design for future performance, sensitivity analysis of gas lift design parameters at well X, and determining the time required for optimum design gas lift system. The methodology used includes literature study, data collection, well modeling, and sensitivity analysis. Well X, which has been producing since 2020, uses a gas lift method with three gas lift mandrels installed at a certain depth. This study evaluates two gas lift deepening methods, namely using a siphon string and retrofit gas lift (RGL). The results show that both methods are not better than the existing gas lift system in the current condition. Sensitivity analysis on injection depth in both methods and coiled tubing size in RGL was conducted to obtain optimum results. Since in the present condition both methods of deepening the injection point in the gas lift are not better than the existing gas lift system, a sensitivity analysis of the gas lift design is carried out to improve the performance of well X in the future. Determining under what conditions the X well requires optimum design of the gas lift system. reservoir conditions with a pressure of 550 psi and a GOR of 172 SCF/STB, it was found that the well would not flow without deepening the gas lift. Deepening the gas lift under these conditions made the well flowable, using a siphon string at the injection points of 5176 ft MD and 6800 ft MD, obtained fluid rates of 385 BFPD and 696 BFPD, respectively. Using Retrofit gas lift (RGL), a rate of 452 BFPD was obtained for a deepening of 500 ft TVD and 729 BFPD for a deepening of 1000 ft TVD. The results of sensitivity analysis on RGL showed that the deeper the injection point, the greater the production rate obtained, but higher injection pressure is required. This study concludes that optimum gas lift deepening design can significantly improve the performance of well X under certain reservoir conditions, and provides guidance for further development in gas lift technology