Downhole hammer

Details Downhole hammer Downhole hammer

E - Fixed Constructions

21

B

255/41

E21B 4/14 (2006.01)

Patent

CA 1264733

ABSTRACT A down hole hammer comprising a substantially cylindrical casing having a top sub at one end and a drill bit support at the other, a central passageway extending through the top sub, casing and drill bit support to define an annular space between the internal face of the casing and of the central passageway, an annular piston reciprocately accommodated within the annular space for movement between an impact position at which said piston abutts said drill bit support and a raised position at which said piston is spaced from the drill bit support, fluid porting means being provided to said annular space to effect the reciprocation of the piston between the raised and impact position, the exhaust from the annular space during reciprocation of the piston being exhausted into the central passageway, a fluid bypass extending between the top sub and the drill bit support and having an outlet opening into the central passageway of the drill bit support and being directed towards the top sub.

517315

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