Underreamer

Details Underreamer Underreamer

E - Fixed Constructions

21

B

E21B 10/02 (2006.01) E21B 7/28 (2006.01) E21B 10/34 (2006.01)

Patent

CA 2151212

An underreamer which may be mounted on a core drill to allow single phase underreaming or creation of a bore hole of larger diameter beneath a pilot hole. A plurality of levers are powered by a plurality of corresponding jacks which are adapted to exert pressure on the levers in order to cause them to extend beyond the periphery of the expander body. Each lever contains at least one roller-cutter rotatably mounted to the lever so that when the levers are forced outward, the roller-cutters crush rock beyond the periphery of the expander body and thus underream the bore hole.

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