Pemilihan Metode, Desain, Dan Implementasi Artificial Lift DI Lapangan L Dengan Metode Permodelan Produksi Terintegrasi

Abstract

Field L is still capable of producing under natural flow conditions. However, its production rate is not yet optimal, therefore efforts to enhance production are required through the implementation of an artificial lift method. Field L is one of the important assets in the oil and gas industry that is currently experiencing a decline in reservoir pressure, resulting in insufficient natural energy to lift fluids to the surface optimally. This condition necessitates the implementation of an artificial lift method to maintain and enhance production. Based on technical considerations, gas lift was selected due to the availability of gas supply, its suitability for multiphase fluids, and its effectiveness in medium to deep wells. This study aims to determine the appropriate artificial lift method, design a gas lift system, and develop an integrated model for Field L using the Integrated Production Modelling (IPM) approach. The methodology involves integrating reservoir, well, and surface network models to comprehensively evaluate the performance of gas lift distribution. The results indicate that under natural flow conditions, well L-12 is still capable of producing. However, the production rate is not optimal due to high fluid density and pressure losses within the tubing. The implementation of gas lift successfully reduces fluid density, shifts the Vertical Lift Performance (VLP) curve, and increases the production rate by improving the operating point based on nodal analysis. The gas lift design in well L-12 consists of two unloading valves and one orifice, strategically placed to support gradual unloading until stable flow conditions are achieved. Gas injection rate optimization shows that increasing the injection rate up to approximately 5 MMscf/day significantly improves production, reaching a maximum of around 4,450 STB/day. However, further increases beyond this rate do not result in substantial production gains due to the dominance of frictional pressure losses. Therefore, the application of IPM in gas lift design and optimization proves to be effective in enhancing production performance and determining optimal operating conditions in Field L