Guided drilling system with shock absorber

Details Guided drilling system with shock absorber Guided drilling system with shock absorber

1996-04-29

1998-07-14

Smith, Scott A.

Tool driving or impacting

Self-acting advance and retraction cycle

173 46, 173 81, 173 91, 173136, 173184, 173171, 1731621, B25D 1724, E21B 1700

Patent

active

057789878

ABSTRACT:
There is provided a guided drilling system and an in-the-hole shock absorber adapted thereto. The guided drilling system includes a drill string configured to continuously and accurately bore a hole in the ground without the need to periodically break the connection of the drill string. In order to protect the components of the drilling system a hollow core shock absorber for percussive drill strings has been designed. A centrally disposed coil spring transmits the necessary thrust to a percussive hammer while providing a resilient cushion for vibration displacement. Pressurized fluid flows through the center of the shock absorber through a poppet valve.

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