Improved drilling arrangement and method

Details Improved drilling arrangement and method Improved drilling arrangement and method

E - Fixed Constructions

21

B

E21B 4/14 (2006.01) B25D 17/06 (2006.01)

Patent

CA 2135786

A drilling arrangement is provided having a reciprocating piston hammer which hammers a drill bit for hydraulic down-the-hole piston hammer drilling. The drilling arrangement uses a liquid for driving the reciprocating piston hammer with respective impacting facing surfaces between the hammer and the drill. The respective impacting facing surfaces are formed such that at the moment of impact some of the liquid is forced between the impacting surfaces. This substantially reduces if not eliminating altogether the cavitation which might otherwise develop.

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