APPARATUS FOR INCLINED BOREHOLE DRILLING Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: apparatus has body with through chambers and shaft located coaxially in the body. In cavity of chambers there are plungers with shoes, located outside of the body. Chambers have guiding surfaces, and plungers under have roller pushers. In process of apparatus descending in borehole, mounted between sections of bottom hole engine plungers under action of springs are protruded out of chambers. In inclined boreholes, drilling tool lays on lower wall of borehole and as a result of it shoe, that is contacting borehole wall, presses plunger and using roller-type pusher, hinged to the plunger, shifts shaft of bottom hole engine. Deflecting force, created on drilling bit in process of drilling, leads to increase of azimuth. EFFECT: apparatus is used for unoriented control of azimuthal curvature of borehole trajectory. 3 dwg