Projectile assisted drill for seismic operations

Details Projectile assisted drill for seismic operations Projectile assisted drill for seismic operations

1998-03-05

1999-12-07

Bagnell, David

Boring or penetrating the earth

Boring with explosion in inaccessible hole

Firing control mechanically actuated in bore

175 2, 299 13, E21B 718

Patent

active

059967099

ABSTRACT:
A portable system for drilling geophysical shot holes in mixed geologic conditions. The system includes a drill for creating a shot hole in unconsolidated soil and for maintaining gauge in mixed geologic conditions. An explosive projectile for contacting hard rock is directed by a shot barrel, and a compressed air device removes residue from the shot hole. A controller can selectively discharge explosive projectiles when the drill bit encounters hard rock, and can cease the discharge of explosive projectiles when the drill bit encounters unconsolidated soil below hard rock. The system is particularly useful in preparing a slender shot hole in remote conditions restricting the mobility of drilling equipment, and in mixed geologic conditions comprising unconsolidated soils and hard rock aggregates or base rock.

REFERENCES:
patent: 3576219 (1971-04-01), Angona
patent: 3633686 (1972-01-01), Bennett
patent: 4088368 (1978-05-01), Lavon et al.
patent: 4582147 (1986-04-01), Dardick
patent: 5148877 (1992-09-01), MacGregor
patent: 5829538 (1998-11-01), Wesson et al.

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