| 摘要 |
A method for drilling an auxiliary hole, such as a conductor hole, a mousehole or a rathole, useful in wellbore drilling operations, the method comprising the steps of installing an auger drive unit (10) on a drill floor (8) of a drilling rig (R), the auger drive unit (10) comprising a drive (50) having a rotor (51), and a structure (20) for supporting the drive (50), the drive (50) movable in a substantially vertical plane in relation to said structure (20), the method further comprising the steps of connecting an auger (16) to said rotor (51) and rotating said auger (16) to drill said auxiliary hole.
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