TOP DRIVE AND TOP DRIVE OPERATION METHOD

摘要

method for operating the top drive (7) on a drill rig (1), in which the top drive (7) is connected to a drill string (2), the method comprising: defining a rotation speed (rs) and an applied torque from the top drive (7) to a defined level, where the applied torque is limited by an operating torque limit (otl); identify a potential or actual event of reverse rotation (backspin); and temporarily increasing the torque limit of the top drive (7) to a torque limit of reverse rotation prevention (btl) in response to the identification of the potential or actual reverse rotation event a top drive (7) is also provided for a probe drilling (1), in which the top drive (7) is connected to a controller (8) having a processor with a program incorporated in a non-transitory computer-readable medium to execute a method for operating the top drive (7).