Steep angle raise bit

Details Steep angle raise bit Steep angle raise bit

1978-11-06

1980-02-05

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175 53, 175385, E21B 924, E21C 2300

Patent

active

041868099

ABSTRACT:
A raise bit for enlarging a pilot hole into a larger diameter hole by disintegrating the earth formations that surround the pilot hole is provided with a cutter arrangement that provides a continuous angle bottom configuration in the range of 134.degree. to 60.degree..

REFERENCES:
patent: Re27597 (1973-03-01), Talbert
patent: 3231029 (1966-01-01), Winberg
patent: 3894402 (1975-07-01), Cherrington
patent: 3917009 (1975-11-01), Dyer et al.
patent: 4071098 (1978-01-01), Dively et al.

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