Perpustakaan Digital ITB

Horizontal well drilling has become a strategic solution to enhance reservoir contact, especially in thin reservoir zones or when the target reservoir is not located directly beneath the drilling rig. One of the key success factors in horizontal well drilling is the design of the bottom hole assembly (BHA), which ensures borehole quality and provides directional control for the driller to reach the target. This study aims to BHA design, focusing on bit and stabilizer selection, and drill collar and stabilizer placement using the principles of fulcrum and packed hole assembly to control inclination angles during drilling, while concerning its limitation. The result of this study shows that fulcrum assembly was applied to build angle in the 12¼” hole section. Meanwhile, packed hole assembly was utilized to maintain angle, which already formed up to 89.69° when drilling through reservoir zone in 8½” hole section. The result of the limitation calculation, such as critical weight on bit for each section are 15.76 kip, 15.24 kip, and 7.25 kip for sinusoidal buckling and 30.47 kip, 29.46 kip, and 14.02 kip for helical buckling, and critical rotating speed for each section are 188.14 rpm, 154.57 rpm, and 296.91 rpm. Also, the simulation showed that no BHA failure for the configurations in each section and the flow rates, which 900 gpm, 800gpm, and 260 gpm could lift all of cuttings to the surface with laminar flow. Furthermore, this study shows that PDC bit and integral blade stabilizer proved effective to drill the hard and abrasive formations.