Perpustakaan Digital ITB

Sand production is one of the primary challenges in developing gas fields with unconsolidated reservoir rocks. To mitigate this issue, gravel pack methods are widely implemented as an effective sand control technique. However, the installation of a gravel pack can also introduce additional flow resistance, represented by increased skin. This study aims to analyze the effect of gravel pack permeability variation on total skin and gas well performance, using data from a well in the Tunu Field, East Kalimantan. Simulations were conducted using PROSPER software, with sensitivity analysis on gravel pack and reservoir permeability to observe their impact on the well's Absolute Open Flow (AOF). The results show that at high reservoir permeability, using high gravel pack permeability can significantly reduce total skin, while in low-permeability formations, the reduction becomes less significant beyond an optimum Kgp value. Analysis of the Kgp/Kres ratio against the AOF after/before ratio indicates that higher ratios generally yield better productivity, although in low-permeability formations, high productivity can still be achieved even with relatively small Kgp values. An empirical correlation between the Kgp/Kres ratio and the AOF after/before ratio follows a logarithmic trend with a determination coefficient of 0.8091. These findings highlight the importance of optimizing gravel pack design to specific reservoir conditions to ensure both effective sand control and optimal gas well performance.