ELECTROPULSE DRILLING RIG Russian patent published in 2012 - IPC E21B7/15 E21C37/18 

FIELD: mining.

SUBSTANCE: rig comprises several parallel drilling assemblies installed on a rotary platform 1 and equipped with a common drilling string 2, and every of which comprises the following serially connected components: a submerged charging device 3, a submerged source of high-voltage pulses 4, a high-voltage input 20 and a drilling tip representing a comb 5 with grounded electrodes 6 and a comb 7 with high-voltage electrodes 8. In the centre of the platform 1 (at the side of the bottomhole) there is a support grounded electrode 9 fixed. In order to increase efficiency of drilling, on the platform 1 there are sludge pumps 10 installed, and downstream their slot nozzles 13 at the bottom there are rock-breaking elements fixed with reinforced cutters to the platform 1, bottomhole ends of grounded electrodes 6 and high-voltage ones 8 are bent towards the side that is reverse to the direction of rotation of a drilling assembly, high-voltage electrodes 8 are equipped with insulation coatings.

EFFECT: increased efficiency of drilling.

4 cl, 3 dwg