Perpustakaan Digital ITB

Geothermal drilling in multi-fractured formations often faces a significant challenge, namely loss circulation, which can impede drilling progress. This study presents an analysis of an aerated drilling operation conducted on a geothermal well in Field XX, located in a multi-fractured zone in West Java. The primary objective of implementing aerated drilling is to mitigate total loss circulation issues by reducing the Equivalent Circulating Density (ECD), thereby achieving a hydrostatic pressure lower than the formation pressure and enhancing cuttings lifting capability. Aerated drilling was applied to the 12-1/4” and 9-7/8” sections, particularly after encountering Total Loss Circulation (TLC) at a depth of approximately 2,530 mMD. Operational results indicate that aerated drilling successfully reached the well's Total Depth (TD) of 3,004 mMD despite persistent total loss circulation conditions. The method proved effective in enhancing drilling efficiency, achieving a maximum Rate of Penetration (ROP) of 13.1 m/hour in the 9-7/8” section. The enhanced ROP enabled the completion of drilling in 39.77 days, 15.23 days ahead of the 55-day schedule, resulting in cost savings of 1.6 million USD. Therefore, it is expected that this study will provide in-depth insights into the potential of aerated drilling as a sustainable solution within the geothermal industry.