Liquid-driven downhole hammer drill

Details Liquid-driven downhole hammer drill Liquid-driven downhole hammer drill

E - Fixed Constructions

21

B

E21B 4/14 (2006.01) E21B 21/12 (2006.01)

Patent

CA 2133425

2133425 9320322 PCTABS00027 A drill stem arrangement and method in which the motor for providing the hammer action is in the drill stem (1) near to the drill bit (4). The motor (3) is driven by pressurised liquid (8) and preferably a proportion (7) of the liquid is used for flushing drill cuttings and cooling the drill bit or alternatively the majority (5) of the liquid is returned up the drill stem.

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