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Slimhole drill system

  • US 6,000,479 A
  • Filed: 01/27/1998
  • Issued: 12/14/1999
  • Est. Priority Date: 01/27/1998
  • Status: Expired due to Fees
First Claim
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1. A system for drilling a slender borehole through geologic formations until the borehole end reaches a selected location, comprising:

  • a hollow drill pipe having a lower end extending into the borehole end;

    a drill bit attached to said drill pipe lower end;

    a plurality of projectiles;

    a pulsed generator;

    a rail gun having substantially parallel electrodes separated by an electrode gap and engaged with said pulsed generator for accelerating each of said projectiles through said electrode gap and into contact with the geologic formation to form debris as the borehole depth is extended; and

    a means for introducing compressed gas into said drill pipe interior for removing debris from the borehole.

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