Large diameter drill bit

Details Large diameter drill bit Large diameter drill bit

1981-10-26

1982-12-14

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

299 81, 299 90, E21B 1010, E21B 1018

Patent

active

043633676

ABSTRACT:
A drill bit is disclosed for drilling large diameter shafts. The drill bit comprises a main bit body having a plurality of cutter assemblies rotatively mounted on the lower side thereof. The cutters contact and disintegrate the earth formations at the bottom of the shaft, thereby creating rock chips. The cutters are strategically located along arcuate paths and extending generally from the bit gage or periphery to the center of the bit. An arcuate channel is formed by the bit body to house the cutters and to provide a high velocity flow path for drilling fluid which engulfs all the cutters and flushes the rock chips away during operation of the bit. Drilling fluid containing rock chips enters the drillstring at the center of the bit body and is then pumped up and out of the shaft being drilled.

REFERENCES:
patent: 2201219 (1940-05-01), Bell
patent: 2811341 (1957-10-01), Robbins
patent: 2838284 (1958-06-01), Austin
patent: 3292719 (1966-12-01), Schumacher, Jr.
patent: 3358783 (1967-12-01), Raynal et al.
patent: 3548949 (1970-12-01), Hasiba
patent: 3951220 (1976-04-01), Phillips, Jr. et al.
patent: 4007799 (1977-02-01), Dixon et al.
patent: 4125167 (1978-11-01), Evans et al.
patent: 4192556 (1980-03-01), Grandori
patent: 4227583 (1980-10-01), Benjamin

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