Slimhole drill system

Details Slimhole drill system Slimhole drill system

1998-01-27

1999-12-14

Tsay, Frank

Boring or penetrating the earth

Boring with explosion in inaccessible hole

Projectile forms bore

E21B 700

Patent

active

060004797

ABSTRACT:
A system for drilling a slender borehole through geologic formations. The system comprises a hollow drill pipe having a drill bit for maintaining gauge of the borehole. A pulsed generator such as a homopolar generator provides the power for operating a downhole rail gun. One or more projectiles are accelerated by the rail gun to impact the geologic formations and to extend the borehole length. A plasma generating material is attached to the projectiles to generate a plasma for accelerating the projectiles, and the projectiles can include a secondary explosive for impacting the geologic formations. A controller controls the operation of the rail gun in cooperation with the drill rate to provide interactive control over the firing rate and energy of projectiles impacting the geologic formations.

REFERENCES:
patent: 2265982 (1941-12-01), Bolton
patent: 2636561 (1953-04-01), Harrison
patent: 2664156 (1953-12-01), Allen
patent: 2884836 (1959-05-01), Allen
patent: 3070010 (1962-12-01), Robinson, Jr.
patent: 4030557 (1977-06-01), Alvis et al.
patent: 4419935 (1983-12-01), Shibukawa

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