Uphole hammer

Details Uphole hammer Uphole hammer

E - Fixed Constructions

21

D

E21D 3/00 (2006.01) E21B 4/14 (2006.01) E21B 7/28 (2006.01)

Patent

CA 2065125

ABSTRACT An uphole hammer comprising a substantially tubular housing which is closed at a first end and supports a substantially centrally located fluid supply tube at the first end, wherein the fluid supply tube extends axially through the housing and is adapted to be mounted at its other end to a drill string, the fluid supply tube being adapted to receive fluid being directed to the hammer by the drill string, the housing further supporting a drill bit at or towards its other end which is slidably received about the fluid supply tube, a piston also being slidably supported about the fluid supply tube in the housing for reciprocation between the drill bit and the first end of the housing, and a fluid port being provided to alternately admit fluid to the spaces defined between each end of the piston and the respective ends of the housing to effect reciprocation of the piston between a first position at which it impacts on the drill bit and a second position at which it lies in the vicinity of the first end of the housing.

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