Schlumberger

Tech Report: CNOOC Drills Through ZOE with Near-Pinpoint Trajectory Control in East China Sea

CNOOC Drills Through ZOE with Near-Pinpoint Trajectory

Publication Date: 09/13/2017

CNOOC China Ltd. needed to drill a 12 1/4-in section to reach TD. However, the optimal trajectory required an azimuth of 0.09°—forcing the well design to plot through the ZOE and presenting additional accuracy challenges. Avoiding the ZOE meant that well tortuosity would increase tremendously. It would also force a much longer well path, increasing other drilling costs. It was determined that the PowerDrive Xcel rotary steerable system in gyro mode was the best solution.




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