Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Patent
1995-01-27
1996-04-16
Bagnell, David J.
Boring or penetrating the earth
Bit or bit element
Bit with leading portion forming smaller diameter initial bore
175394, E21B 1026, E21B 1044, E21B 2502
Patent
active
055073573
ABSTRACT:
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 the downhole end of the pilot bit for opening and closing the throughbore, and pilot bit cutting teeth secured to the closure device. 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 device seals the throughbore and the pilot bit cutting teeth are disposed for cutting into an earth formation upon rotation of the pilot bit.
REFERENCES:
patent: 2054255 (1936-09-01), Howard
patent: 3095051 (1963-06-01), Robinsky et al.
patent: 3924697 (1975-12-01), College
patent: 4248313 (1981-02-01), Bonca
patent: 4667754 (1987-05-01), Diedrich
patent: 5158147 (1992-10-01), Pavey et al.
Asak Kare
Hult Vern
Bagnell David J.
Foremost Industries Inc.
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