Patent ID: 6516900
Filing Date: 2003-02-11
Classification: E21B

Abstract:
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); (25A-25C) is provided with an inner collared rim, and is exposing an extended face to a tubular packer (26), the rim restricting the outward movement of the at least one pad in the tubing (28).