| 摘要 |
FIELD: mining.SUBSTANCE: group of inventions relates to drill bits and methods for producing fragments of core samples from underground formation. Drilling bit includes bit housing with central axial line of bit and end of bit; set of blades passing radially along tool face and separated by set of flow passage channels between each other, wherein one of set of blades is blade coring containing vertical surface and inclined surface, at that, in fact, vertical and inclined surfaces integrally connected; and set of cutting elements located on set of blades, one of set of cutting elements is first cutting element arranged on blade coring at first radial position from central axial line of bit.EFFECT: technical result consists in increase of drilling bit drilling rate.36 cl, 30 dwg |
