Apparatus and method for enlarging underground arcuate bore hole

Details Apparatus and method for enlarging underground arcuate bore hole Apparatus and method for enlarging underground arcuate bore hole

1977-03-30

1978-10-03

Purser, Ernest R.

Boring or penetrating the earth

Enlargement of existing pilot throughbore requiring...

175 62, 175107, 405184, E21B 312

Patent

active

041178955

ABSTRACT:
A hole-opener and a hole-opener apparatus is provided for enlarging a pilot hole of the inverted arcuate type which bypasses an obstacle, the pilot hole having an entrance and terminal end, both ends usually being accessible to surface drilling equipment.

REFERENCES:
patent: 2746719 (1956-05-01), Seligman
patent: 2837324 (1958-06-01), Aschacker
patent: 3508620 (1970-04-01), Pennington
patent: 3894402 (1975-07-01), Cherrington
patent: 3905431 (1975-09-01), Hasewand

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