To accurately control the amount of force applied to the bit, the driller carefully monitors the surface weight measured while the bit is just off the bottom of the wellbore.

为准确地控制施加于钻头上的力的大小，当钻头刚刚离开井底时司钻要仔细监测地表测得的重量。

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To accurately control the amount of force applied to the bit, the driller carefully monitors the surface weight measured while the bit is just off the bottom of the wellbore.

为准确地控制施加于钻头上的力的大小，当钻头刚刚离开井底时司钻要仔细监测地表测得的重量。

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