FACILITY FOR BOREHOLE DRILLING (VERSIONS) Russian patent published in 2009 - IPC E21B4/00 E21B10/08 

FIELD: mining.

SUBSTANCE: facility for borehole drilling consists of cone bit with support, above-bit tube, unit for support unloading in form of washing plate with circular lug creating together with reverse cones of roller cutters friction pairs, facility also consists of unit of forced-circulation running of roller cutters installed inside above-bit tube and made in form of axial turbine, shaft of which is connected with washing plate. According to one version the reverse cones of roller cutters are made with a circular groove, while the circular lug of the washing plate contacting with them has congruous shape and is assembled in circular grooves of reverse cones of roller cutters. According to another version the circular lug of the washing plate on end is made with at least one circular groove, while contacting with it reverse cones of roller cutters have congruous shape and lugs of reverse cones of roller cutters placed in circular groove are installed with a gap relative to the bottom of the circular groove and armoured with rock destroying elements.

EFFECT: increased calibrating characteristic of cone bit, increased driving property and mechanical rate of drilling.

3 cl, 3 dwg