技术报告

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

已发表: 09/13/2017

技术报告

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

已发表: 09/13/2017

CNOOC successfully reached the TD with a center-to-center distance between planned Tie-in 0 MD, 0 TVD and actual trajectory of 2.14 m [7 ft]

地点

中国, 亚洲

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East China Sea

Borehole
12 1/4 in

Drilling interval
3,498- to 3,944-m
[11,476- to 12,938-ft] MD,
3,457- to 3,780-m
[11,342- to 12,402-ft] TVD

Zone of exclusion (ZOE) alert zone
678–3,919 m
[12,067–12,854 ft]

ZOE fail zone
3,711.83–3,874.68 m
[12,178–12,713 ft]

背景

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.

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

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

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