METHOD FOR SURFACE-BOREHOLE MINERAL MINING Russian patent published in 2007 - IPC E21C45/00 

FIELD: hydraulic mineral mining, particularly downhole apparatus for hydraulic surface borehole mineral mining.

SUBSTANCE: device comprises concentric outer and central pipe strings. Outer pipe string is adapted to supply water. Inner one is used for pulp discharge. Air supply string is installed between central and outer pipe strings. Additional pipe is located in end part of the device between water supply and pulp discharge pipe strings. Additional pipe may move with respect to outer pipe string. Sealing means is arranged between outer water supply pipe string and additional pipe. Hydraulic monitor device is installed on additional pipe. Lower part thereof is provided with rock-cutting tool. Central pulp discharge pipe string may slide with respect to outer water supply one. Compressed air inlet orifices are made in lower part of central pulp discharge pipe string. Air supply pipe string is fixedly connected with additional pipe in lower part thereof. Lower end of outer water supply string is provided with thrust ring. Sealing means made as sealing collars is installed between outer water supply pipe string and upper part of additional pipe provided with drill string at lower end thereof. Pulp receiving windows and working liquid supply channels, as well as chamber and flushing orifice adapted to establish communication with well bottom zone are formed in additional pipe.

EFFECT: increased efficiency of hydraulic mineral mining due to possibility to cut productive seam formed by coherent rock.

7 dwg