FIELD: mining.
SUBSTANCE: group of inventions relates to hybrid drill bits. Hybrid drill bit designed with formation of gaging, bending, nose and cone areas, includes bit housing having a longitudinal central axis; at least one blade extending from drill bit housing; first and second legs extending from drill bit housing; first cutter, which is fixed with possibility of rotation on first blade, moving away inside central axis, and which has several cutting elements in area of bending or nasal area; second cutter, which is fixed on second blade, moving away inside central axis, and which has several cutting elements in the area of bending or nasal area; wherein first rolling cutter has maximum outer diameter in area of bending or nasal area, which is greater than maximum outer diameter of second cutter in area of bending or nasal area.
EFFECT: technical result consists in ensuring operation with reduced tracking and improved efficiency of drilling.
34 cl, 19 dwg
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