Boring or penetrating the earth – Processes
Patent
1994-07-28
1997-01-21
Dang, Hoang C.
Boring or penetrating the earth
Processes
175393, 175429, 175431, E21B 1046
Patent
active
055952526
ABSTRACT:
A drill bit assembly comprising a plurality of cutter units, with each cutter unit comprising a circumferentially forward, relatively blunt positioning cutter, followed by a fixed cutter having a relatively sharp cutting edge, with the cutting edge of the following cutter being positioned a predetermined distance below an operating position of the positioning cutter. Thus, the cutting depth of the following cutter is controlled by the positioning cutter locating the drill bit assembly against the hole end wall from which material is being cut. Also, additional fixed cutters can be provided in circumferential alignment in said cutting units, and liquid jet cutters can be used in combination with said cutting units.
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Dang Hoang C.
Flowdril Corporation
Hughes Robert B.
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