High speed electromagnetically accelerated earth drill

Details High speed electromagnetically accelerated earth drill High speed electromagnetically accelerated earth drill

1990-03-09

1991-03-05

Dang, Hoang C.

Boring or penetrating the earth

Boring with explosion in inaccessible hole

Firing control mechanically actuated in bore

175 457, 175 19, 175 62, 175162, E21B 726, E21B 700

Patent

active

049970470

ABSTRACT:
The disclosure describes an apparatus to use multiple expendable electromagnetically accelerated drill heads that are propelled into a electromagnetic accelerator that further accelerates the expendable drill heads to velocities as high as 30,000 ft./second to drill horizontal holes. Acceleration is achieved by making use of electromagnetic forces induced in a coil by opening a charged "ringing" circuit containing a capacitor interacting with magnetic poles around the expendable projectiles or drill head. Multiple accelerating coils, each charged by a D.C. source, are used while initial acceleration may be by interaction of electromagnetic fields between conductive rings on the drill head and induction coils.

REFERENCES:
patent: 3695715 (1972-10-01), Godfrey
patent: 4004642 (1977-01-01), Dardick
patent: 4030557 (1977-06-01), Alvis et al.

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