DRILLING DEVICE Russian patent published in 1999 - IPC

FIELD: drilling machinery and equipment. SUBSTANCE: device can be used for drilling deep bore-holes. Device has drilling bit secured on shaft-rotor of turbo-drill, its body by means of adapters and thread is fastened to rod of press. Body of press is attached by thread to drilling string. Installed in turbo-drill is turbine. Blade rims of turbine have profile of blades, and attacked surfaces of them are made either flat or slightly convex. Arranged above press piston is one or several springs which by their one end rest on piston and rod stop of press, and by other end they rest on adapter of press body. Above-piston space of press is hydraulically connected with space behind its body by means of openings. Under-piston space of press is connected with internal space of rod by means of openings. Application of aforesaid embodiment of drilling device allows for automatic changing of axial thrust on drilling bit in driving horizontal sections of inclined-directed bore-holes, and in case of necessity it allows for reversed feeding of drilling bit with breaking it off bottom-hole if wedging occurs. Overall, it results in increased drilling productivity. EFFECT: higher efficiency. 5 dwg