专利名称：Apparatus for directional drilling发明人：VIKTOR TOKLE申请号：AU1514200申请日：19991207公开号：AU1514200A公开日：20000626
摘要：Grip and guiding device for directional drilling, in order to drill straight orcurved holes with a predetermined path. The device includes a drill string (11-21)comprising parts which rotate during drilling, including a drill bit (11) or a water hammeron its front end and a non-rotating packer unit (14) with a packer tubing (28) comprisingone or several projecting pressure pads (25,31-32) arranged behind the drill bit (11) orthe water hammer. The pressure pad or pads are arranged to be pressed out towardsthe drill hole wall by means of the pressure from a drill fluid when this exceeds a certainlevel. The pressure pad (25) or the pressure pads (25A-25C) may be arrangedasymmetrically and/or affects the packer tubing (28) asymmetrically, e.g. by havingdifferent heights. The pressure pad(s) force guiding ribs on the opposite side into thehole wall in order to prevent rotation of the packer unit (14). The pressure pad orpressure pads can on deactivation be withdrawn for performing linear drilling.
申请人：DEVICO AS
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