DEVICE FOR COMBINED MECHANICAL AND THERMAL WELL ENLARGEMENT Russian patent published in 2010 - IPC E21B7/14 E21B7/28 

FIELD: mining.

SUBSTANCE: proposed device comprises drilling rod with rock crushing elements, burner with fuel and air feed lines fitted at the rod end face, dust-and-gas killing unit with built-in tube for discharging hot vapor-gas flow into ambient air, control board, electric heaters with adsorber accommodated inside air feed line. Adsorber represents two different-diametre cylinders fitted one into another. Note that smaller cylinder inner wall is tightly fitted on outer surface of aforesaid discharge tube and accommodated in spring-loaded cartridge that moves free vertically between larger cylinder inner surface and smaller cylinder outer surface. Larger cylinder inner surface top part accommodated slide valve secured thereto, while outer part has valve orifice. Burner incorporates at least two opposed taper nozzles with their inner surfaces provided with curved grooves. Inner surface of one taper channel has curvature of lead groove is directed clockwise, while that on inner surface of opposed nozzle is directed counter clockwise.

EFFECT: higher efficiency of well enlargement.

5 dwg