DEVICE FOR WELL DRILLING Russian patent published in 2016 - IPC E21B7/00 E21B4/18 

FIELD: mining.

SUBSTANCE: invention can be used for well drilling. Device comprises lowered on sleeve into well casing with drill tool, installed with possibility of axial movement relative to it on hollow shaft. In housing there is a rotation drive and mechanical drive of axial movement of hollow shaft of drilling tool. Rotation drive of drilling tool in housing there is a hydraulic motor with drive hollow shaft. Sleeve on which is suspended body is armoured and high pressure hoses are passed through it for supply of gaseous or liquid working medium, one of which is connected to hydraulic motor. Drive shaft is passed in hollow shaft drilling tool and connected therewith to displace axially relative to it. Housing is equipped with expansion mechanism made in form of installed outside housing with possibility of radial movement relative to housing by means of pneumatic or fluid cylinders of spacer dies connected to second high-pressure hose. Hollow shaft is installed in guide pipe thereof, connected with mechanical drive of axial movement of drilling tool and equipped with thrust flange. In lower part of housing and in drilling tool there are, communicated with armoured sleeve through cavity of housing, channels for supply of compressed air or drilling mud.

EFFECT: higher reliability with simultaneous improvement of efficiency.

1 cl, 1 dwg