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Drilling Tool Steering Device

  • US 20090166089A1
  • Filed: 03/26/2007
  • Published: 07/02/2009
  • Est. Priority Date: 03/27/2006
  • Status: Active Grant
First Claim
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1. Drilling tool steering device comprising, consecutively from upstream to downstream, a main body (1) and a steerable housing (2), joined respectively by at least one connection of pivot, sliding pivot, ball joint or annular linear type forming a first bearing (4), and at least one pivot connection forming a second bearing (5), to a bendable or flexible transmission shaft (3) which crosses them longitudinally, whereas a connection of pivot, sliding pivot, annular linear or ball joint type forming a third bearing (6) between said transmission shaft and the main body (1) is arranged in proximity to the end of said main body situated in the direction of the steerable housing, and whereas steering is carried out thanks to means acting as a deflection system (7) for the essentially radial relative displacement of the main body (1) in relation to the steerable housing (2) in proximity to their interface,said main body being optionally equipped on its periphery with bearing pads (9) of diameter less than or equal to the diameter of the drilling tool/bit (16), andsaid steerable housing being optionally equipped on its periphery with bearing pads (10a) of diameter less than or equal to the diameter of the drilling tool/bit (16) toward its end situated in the direction of the drilling tool/bit, and with fixed or expandable pads or clamps toward its end situated in the direction of the main body (1).

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