COLUMN SET Russian patent published in 2018 - IPC E21B10/04 E21B25/00 

FIELD: mining.

SUBSTANCE: invention relates to the field of mining operations, namely, to drilling tools for wells with core sampling. Column set contains a drill bit with a body connected to the outer tube and a cutting matrix with internal flushing grooves. In the cavity of the outer tube with the possibility of sliding movement is placed a guide, made in the form of a combination of forms with the transition line, the lower part – a hollow cylinder, the upper one is a hemisphere, on the axial line of which there is a dead-end pit, where there is a ball float, limited in motion. On the outer cylinder surface of, through longitudinal openings are made, the inner wall is equipped with a rubber gasket. Internal flushing grooves of the cutting die are made with a cross section that tapers downward.

EFFECT: technical result consists in protecting the core from destruction by the flow of the washing liquid, reducing the hydraulic resistances, and the ability of the sub-kicks to prevent the core from moving in the outer pipe.

1 cl, 2 dwg