Patent ID: 6659202
Filing Date: 2003-12-09
Classification: E21B

Abstract:
A steerable directional drilling device for drilling a bore-hole, the device comprising:a drill bit; a fluid hammer coupled to the drill bit, the fluid hammer having: a hammer housing; a piston hammer disposed in the hammer housing, the piston hammer capable of reciprocating movement inside the hammer housing when driven by liquid fluid pressure; a bent steering member coupled to the fluid hammer, the bent steering member including an interior conduit to convey fluid pressure from a drill string to the fluid hammer; a mud motor coupled to the fluid hammer and disposed within the bent steering member, the mud motor rotating the fluid hammer when activated by liquid fluid pressure delivered through the drill string; and an orientation device disposed adjacent to the bent steering member, the orientation device configured to determine the angular orientation of the drill bit and transmit a signal corresponding to the angular orientation of the drill bit.