Claims
- 1. 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 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; and 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 fluid pressure delivered through the drill string.
- 2. The steerable directional drilling device of claim 1 wherein the drill bit is a balanced drill bit.
- 3. The steerable directional drilling device of claim 1 further comprising a sonde disposed adjacent the bent steering member.
- 4. The steerable directional drilling device of claim 1 further comprising a sonde disposed adjacent the bent steering member, and wherein the drill bit is a balanced drill bit.
- 5. 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 fluid pressure; a bent steering member including an inner pipe and an outer housing, the inner pipe being coupled to the fluid hammer, the outer housing and inner pipe being capable of independent rotation, the bent steering member including an interior conduit to convey fluid pressure from a drill string to the fluid hammer.
- 6. The steerable directional drilling device of claim 5 wherein the inner pipe is configured to be coupled to an inner pipe member of a pipe-in-pipe drill string and the outer housing is configured to be coupled to an outer pipe member of a pipe-in-pipe drill string.
- 7. A method for directional drilling with a fluid hammer, the method including the steps of:
providing a fluid hammer coupled to a drill bit and a mud motor disposed within a bent steering member, the bent steering member being coupled to a drill string; rotating the bent steering member to a position aligning the fluid hammer and drill bit in a desired direction; holding the bent steering member in position while pumping fluid to the fluid hammer to operate the fluid hammer; holding the bent steering member in position while pumping fluid to the mud motor to rotate the fluid hammer and drill bit; and advancing the fluid hammer longitudinally.
- 8. A method for directional drilling with a fluid hammer, the method including the steps of:
providing a fluid hammer coupled to a drill bit, the fluid hammer also being coupled to an inner pipe of a bent steering member, the bent steering member including an outer housing, the inner pipe being capable of rotation independent of the outer housing; rotating the outer housing of the bent steering member to a position aligning the fluid hammer and drill bit in a desired direction; holding the outer housing of the bent steering member in position while pumping fluid to the fluid hammer to operate the fluid hammer; while holding the outer housing of the bent steering member in position, rotating the fluid hammer and drill bit by means of the inner pipe member independently of the outer pipe member; advancing the fluid hammer longitudinally.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of U.S. Provisional Application No. 60/221,749 filed on Jul. 31, 2000.
Provisional Applications (1)
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Number |
Date |
Country |
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60221749 |
Jul 2000 |
US |