... 知起下钻short tripping 活动钻具move the drill string 上卸扣make up and break out ...
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move the drill string
移动钻柱
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Drillers also use sensors to detect particularly promising rock intervals within the formation, and are able to move the drill string up or down, left or right as they drill through the horizontal section to target those intervals.
FORBES: Horizontal Drilling: A Technological Marvel Ignored
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