Liquid driven downhole drilling machine

Details Liquid driven downhole drilling machine Liquid driven downhole drilling machine

E - Fixed Constructions

21

B

E21B 6/08 (2006.01)

Patent

CA 2465225

In a liquid downhole drilling machine, the guiding bushing (31) for the drill bit is rotatably journaled in the housing (11, 12) and, via a one-way coupling (29), coupled to a turning sleeve (22) that has axial ridges (24) that bound a number of chambers (25, 26, 27) and form turning pistons for turning the turnable sleeve to and fro. A number of these chambers are coupled to be pressurised and depressurised simultaneously with said pressure chamber (47) with the piston area (46) for urging the piston hammer (30) forwards. As a result, the drill bit (13) will be indexed a defined angle between each impact so that the button inserts of the drill bit will change contact points with the rock between every impact and fragment the rock efficiently. The drill tube is not rotated.

L'invention concerne une machine de forage entraînée par liquide dans laquelle le manchon de guidage (31) du trépan est tourillonné dans le logement (11, 12) et, via un raccord simple (29), couplé à un manchon tournant (22) comportant des saillies axiales (24) qui relient un certain nombre de chambres (25, 26, 27) et forment des pistons tournants destinés à mettre en mouvement de va-et-vient le manchon tournant. Un certain nombre de ces chambres sont couplées de façon à être simultanément mises sous pression ou dépressurisées au moyen de la chambre de pression (47) par la surface de piston (46) afin de solliciter le marteau perforateur (30) vers l'avant. En conséquence, le trépan (13) se retrouve indexé d'un angle défini entre chaque impact de façon que les picots de carbure changent leur point de contact avec la roche entre chaque impact et fragmentent efficacement la roche. Le tube de forage n'entre pas en rotation.

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