FIELD: process engineering.
SUBSTANCE: set of inventions relates to hybrid drill bits. Drill bit comprises bit body with nose, flexure part and gaging part. Besides it has several fixed cutting elements secured to said body to define fixed cutter profile and roller cone secured to said body and having several cutting elements to define the roller cone profile. Fixed cutter profile extends beyond the roller cone profile at, at least its one part while roller cone profile extends beyond the fixed cutter profile at, at least one its part.
EFFECT: higher efficiency, lower loads and wear.
15 cl, 9 dwg
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