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Electromagnetic drilling apparatus

  • US 5,018,590 A
  • Filed: 02/08/1990
  • Issued: 05/28/1991
  • Est. Priority Date: 01/24/1986
  • Status: Expired due to Fees
First Claim
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1. Apparatus for forming a borehole comprising a drill string, an electronic motor connected at the lower end of the string and a drill bit connected at the lower end of said motor, a passageway extends through said motor and drill bit, and an axial passageway extends through said string from which drilling fluid can flow through said motor and to a lower face of said bit;

  • said drill string includes electric conducting members electrically insulated from one another and forming separate current flow paths for flow of current from the upper end of the string to the motor;

    said electric motor includes an eddy current plate and a pulse transformer having induction coils arranged to vibrate said eddy current plate;

    said bit has a main body, a plurality of bit blades, means mounting said bit blades respective to said motor to cause said bit blades to vibrate in response to movement of said eddy current plate and thereby penetrate a geological formation;

    and means including said electric conducting members connected to energize said motor to thereby vibrate said bit blades.

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