RADIAL CLAMPING/SEALING SYSTEM AND DRILLING SYSTEM PROVIDED THEREWITH FOR (SEMI)-CONTINUOUS DRILLING A BOREHOLE, DRILLING RIG COMPRISING SUCH SYSTEM, AND METHOD THERE FOR

摘要

Invention relates to a system and associated method for continuous and/or semi-continuous drilling a borehole, comprising: - a first stationary housing; - a rotatable housing comprising a longitudinal opening for receiving a drill string; and - a radial clamping system configured for holding and clamping the box end of the drill string in substantially radial direction with respect to the rotatable housing; - a first direct sealing system in use arranged between drill pipe and the rotatable housing; - a second indirect sealing system in use arranged between the rotatable housing and the stationary housing; - a mechanical and/or hydraulic transmission configured for radial activation of the radial clamping system; and - a first drive configured for rotating the rotatable housing with the drill string.