ELECTROHYDRAULIC DRILLING HEAD Russian patent published in 1995 - IPC

FIELD: drilling equipment. SUBSTANCE: electrohydraulic drilling head consists of hollow cylindrical body with conical end. The latter contains for rotation a dielectric holder with electric discharge electrodes and discharger which are connected with power source by means of armored flexible cable. Made in cylinder flat base and conical end are hole-nozzles and slot-nozzles directed conformably and tangentially to cone surface. Cylinder surface has helical grooves in direction conformable with direction of slot-nozzles and hole-nozzles. EFFECT: higher efficiency. 4 dwg