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US 6,516,900 B1Granted
Apparatus for directional drilling
AssigneeDevico AS
InventorVictor Tokle
Life of this patent
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AssigneeDevico AS
InventorVictor Tokle
Estimating the term…
Grip and guiding device for directional drilling, in order to drill straight or curved 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 hammer on its front end and a non-rotating packer unit (14) with a packer tubing (28) comprising one or several projecting pressure pads (25,31-32) arranged behind the drill bit (11) or the water hammer. The pressure pad or pads are arranged to be pressed out towards the drill hole wall by means of the pressure from a drill fluid when this exceeds a certain level. The pressure pad (25) or the pressure pads (25A-25C) may be arranged asymmetrically and/or affects the packer tubing (28) asymmetrically, e.g. by having different heights. The pressure pad(s) force guiding ribs on the opposite side into the hole wall in order to prevent rotation of the packer unit (14). The pressure pad or pressure pads can on deactivation be withdrawn for performing linear drilling.
Grip and guiding device for directional drilling, especially for directional drilling with high precision in the guidance of direction in order to drill straight or curved holes with predetermined paths, including a drill string (11-21) comprising parts which rotate during drilling, comprising a drill bit (11) or a water hammer on its front end and a packer unit (14) with a packer tubing (28) comprising at least one pressure pad (25, 25A-25C) arranged asymmetrically behind the drill bit (11), wherein the at least one pressure pad are arranged to be pressed out towards the drill hole wall by means of the pressure from a drill fluid when this exceeds a certain level (P3), and at least one pressure pad (25);
Dependencies are inferred from the claim text.