Rock drilling apparatus and method

Details Rock drilling apparatus and method Rock drilling apparatus and method

1976-09-07

1978-07-25

Purser, Ernest R.

Boring or penetrating the earth

Enlargement of existing pilot throughbore requiring...

175210, 175311, E21B 922, E21B 2100

Patent

active

041024133

ABSTRACT:
A method of drilling a large hole through rock and removing the drilling waste by drilling a pilot hole from one rock face to another, reverse drilling with a large drill bit and removing the waste during the reverse drilling by pressurizing the pilot hole to eject the waste through a muck extractor dragged behind the large drill bit; and an apparatus to carry out this method consisting of a sealing member for the one rock face, and a muck extractor for securement to the large drill bit.

REFERENCES:
patent: 2228709 (1941-01-01), Ruddell et al.
patent: 2746719 (1956-05-01), Seligman
patent: 3045769 (1962-07-01), Feucht et al.
patent: 3231029 (1966-01-01), Winberg
patent: 3674099 (1972-07-01), Kostylev et al.
patent: 3811518 (1974-05-01), Kalaf et al.
patent: 3830318 (1974-08-01), Busby et al.
patent: 3894402 (1975-07-01), Cherrington

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