Challenge: Drill an S-type well to TD in a drilling environment with known high-erratic torque and stick/slip risks.
Solution: Use the PowerDrive vorteX powered rotary steerable system, comprising a PowerDrive Xceed ruggedized rotary steerable system and a PowerPak steerable motor, to mitigate known risks while improving ROP.
Saka Indonesia Pangkah needed to drill an S-type well offshore Indonesia in a difficult environment. The well (UPB-12) was planned to be the first S-type well to drill to 9,618-ft TVD (Ngimbang carbonate formation) with a 61° inclination in Ujung Pangkah field. It was also going to be the field's deepest well—nearly double the depth at TD. However, the drilling environment posed high erratic torque and stick/slip risks.
Schlumberger suggested using the PowerDrive vorteX system to mitigate these risks while improving ROP and reducing the friction factor. The PowerDrive vorteX system is made up of a PowerDrive Xceed RSS and a PowerPak motor and is extremely reliable in abrasive, hot, and high-shock environments.
Saka Indonesia Pangkah planned to use the PowerDrive vorteX system, combined with a customized PDC bit as torque risk prevention, to drill the 8 1/2-in section of the well. The plan entailed dropping the angle from 43° at 7,944-ft MD (5,685-ft TVD) to vertical with a 2.6° dogleg severity until planned TD at 11,900-ft MD (9,618-ft TVD).
Drilling torque ranged from 5,000 to 7,000 ft.lbf with a consistent WOB throughout the process. The stick/slip ratio was reduced to a maximum of 100%, which enables the operator to mitigate stick/slip even when using a more aggressive bit. The average friction factor during rotation was reduced by
18% from 0.28 to 0.23.
By using the PowerDrive vorteX system, Saka Indonesia Pangkah was able to increase ROP by 130% compared with ROP from a standalone BHA and 154% compared with the well plan. The PowerDrive vorteX system significantly improved drilling efficiency, saving rig time and reducing overall cost.
The PowerDrive vorteX system increased ROP 130% and feet per circulating hour 194% compared with conventional systems, even over a longer distance.
Download: Saka Indonesia Pangkah Improves On-Bottom ROP by 130% While Drilling High-Angle S-Type Well (0.15 MB PDF)