Device for widening an earth borehole

Details Device for widening an earth borehole Device for widening an earth borehole

E - Fixed Constructions

21

B

E21B 7/28 (2006.01) E21B 10/44 (2006.01) E21B 10/60 (2006.01) F16L 1/06 (2006.01)

Patent

CA 2236490

In a device for widening an earth borehole there is provided, at the end of a linkage connected to a rotary-tractive drive, at least one broaching spiral having a conical envelope surface, which is mounted rotatably in a bearing member and conveys the excavated soil away counter to the direction of advance, through the widened earth borehole or through a follower pipe.

Dispositif d'élargissement d'un trou de forage comprenant à la fin d'un élément de liaison relié au moteur de rotation et de traction, au moins une spirale d'alésage ayant une surface d'enveloppe conique, qui est installée de manière à tourner dans un élément porteur et éloigne les débris dans la direction opposée à celle de l'avance, en passant par le trou de forage élargi ou par un tube.

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