卸掉卸扣器，下放钻柱让钻头缓慢通过转盘。
Remove breaker and carefully lower bit through rotary table.
钻工使用气动旋扣器卸开扣，或者如果可能，司钻用顶驱卸开扣。
The Floormen spin out the connection using the air spinner, or if applicable, the Driller utilises the top drive to spin out the connection.
钻工使用气动旋扣器卸开扣，或者如果可能，司钻用顶驱卸开扣。
The Floormen spin out the connection using the air spinner, or if applicable, the Driller utilises the top drive to spin out the connection.
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