Pilot bit for use in auger bit assembly

Details Pilot bit for use in auger bit assembly Pilot bit for use in auger bit assembly

E - Fixed Constructions

21

B

E21B 49/02 (2006.01) E21B 10/02 (2006.01) E21B 10/26 (2006.01) E21B 10/44 (2006.01) E21B 25/00 (2006.01) E21B 25/02 (2006.01)

Patent

CA 2115004

A pilot bit for use with an auger bit in an auger bit assembly secured to the downhole end of tubular drill stem for drilling boreholes in earth formations comprises a tubular pilot bit body having a downhole end and an upper end at the axially opposite end of the body, the body being dimensioned to be telescopically received within an axial bore of an auger bit and being releasably connectable to the auger bit against axial and angular displacement, an axial throughbore extending through the body for telescopically receiving an earth sampling tool, a closure device secured to thedownhole end of the pilot bit for opening and closing the throughbore, and pilot bit cutting teeth secured to the closure means. The closure device is movable between an open position removed from the throughbore to permit passage of a sampling tool through the pilot bit into an earth formation and a closed position whereat the closure means seals the throughbore and the pilot bit cutting teeth are disposed for cutting into an earth formation upon rotationof the pilot bit.

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