Downhole drilling hammer

B - Operations – Transporting – 25 – D

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121/30, 255/43

B25D 9/04 (2006.01) E21B 4/06 (2006.01) E21B 4/14 (2006.01) E21B 21/12 (2006.01)

Patent

CA 1224682

PRECIS DE LA DIVULGATION Marteau de forage ?fond de trou? comportant un corps tubulaire alimenté en air comprimé, un taillant de perforation et un piston frappeur mis en mouvement dans un cylindre intérieur par un mécanisme de distribution de l'air comprimé alternativement au-dessous et au-dessus du piston. Le marteau comporte un dispositif d'injection de gazole dans la chambre au-dessus du piston et un mécanisme pour déclancher l'injection lors de la remontée du piston; la compression supplémentaire provoque la combustion du mélange air-gazole, qui projette le piston vers le taillant.

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