Electrical pulse drill bit having spiral electrodes

A drill bit assembly comprising:

• a drill bit body;
• an insulating layer disposed around the drill bit body;
• and
• two electrodes formed such that they both extend from a radial outer surface of the insulating layer, wherein a first electrode of the two electrodes forms a first helix on the radial outer surface and a second electrode of the two electrodes forms a second helix on the radial outer surface,
• wherein a minimum distance between the first helix and the second helix is identical at all locations along the first and second helixes.

A method of drilling a borehole comprising:

• coupling a drill bit assembly to a drill string, the assembly comprising:
• a drill bit body;
• an insulating layer disposed on an end of the drill bit body and that defines a drill bit face;
• two electrodes formed such that they both extend from the drill bit face, wherein a first electrode of the two electrodes forms a first a spiral on the drill bit face and a second electrode of the two electrodes forms a second spiral on the drill bit face and a minimum distance between the first spiral and second spiral is identical at all locations along the first and second spirals;
• and
• a pulse generator electrically coupled to the two electrodes;
• forming a potential between the two electrodes by providing power to the pulse generator;
• allowing the potential to discharge through a formation at or near the drill bit face;
• and
• removing formation fragments from the borehole caused by the discharge.