Rotating boring tool with percussion device

E - Fixed Constructions – 21 – B

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E21B 21/12 (2006.01) E21B 4/14 (2006.01) E21B 7/24 (2006.01) E21B 10/60 (2006.01)

Patent

CA 1219577

PRECIS DE LA DIVULGATION: Outil de forage rotatif muni d'un dispositif de percussion comprenant une tuyère à conduit annulaire cylin- drique et conduit annulaire divergent, suivie de deux chemins d'écoulement, l'un central, l'autre périphérique, parcourus alternativement par la boue de forage pour déplacer une masse de percussion dans un sens ou dans l'autre. L'outil de forage est caractérisé en ce que la surface conique externe du conduit divergent se raccorde à la surface cylindrique externe du conduit cylindrique par un décrochement raidal, ce qui rend instable l'écoulement périphérique.

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