Patent ID: 6293628
Filing Date: 2001-09-25
Classification: E21B,E21C,E21D,E21F

Abstract:
A cutting head for creating a borehole in a mineral seam, comprising:a first body having an axis of rotation generally parallel to said borehole;a manifold for containing high pressure fluid, said manifold being mounted on said first body;a high pressure fluid line for providing fluid to said manifold;a swivel coupled to said high pressure fluid line, said swivel allowing said manifold to rotate relative to said fluid line;a first plurality of nozzles disposed around said axis of rotation for spraying said high pressure fluid; anda plurality of tubes fluidly coupling said manifold and said plurality of nozzles;whereby on supplying a high pressure fluid to said manifold and rotating said cutting head about said axis of rotation, said nozzles create a generally circular, overlapping pattern of high pressure fluid in front of said cutting head, said pattern of high pressure fluid being directed to cut said borehole.