FIELD: mining.
SUBSTANCE: invention relates to a tool for drilling deep wells for oil and gas, in particular to PDC cutters for drill bits. Cutter for drilling bit comprises hard-alloy substrate with PDC-coating, on side surface of which there is an annular groove of semi-circular cross section. Hard-alloy substrate with PDC coating has a protrusion made on the side surface. Cutter additionally contains a hard-alloy body, which is a hollow element plugged from the lower end, containing an annular groove of a semi-circular cross section made on the inner side surface and a through mounting hole of round cross section, made in the cutter body at an acute angle relative to the plane of the plugged end of the body with the possibility of overlapping at the inlet by means of a solder, and at the outlet changing into the annular groove of the body. Hard-alloy body is made with possibility of placement in its inner cavity of hard-alloy substrate with PDC-coating with thrust of upper open end of body against substrate projection. Annular groove of the substrate and the annular groove of the body are located opposite each other and form an annular cavity of circular cross section. Cutter comprises a fixture in the form of a plurality of steel fixing balls made with the possibility of being inserted into the said annular cavity through the mounting hole of the body and placed in this cavity close to each other.
EFFECT: due to the rotation of the cutting edge through 360 degrees, the PDC-bit service life is increased compared to fixed cutters; the rotating cutters also keep the cutting edge intact for a longer time and increase the operating time of the cutter; due to rotation, drilling of the bit is increased by 40-60%.
6 cl, 4 dwg
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Authors
Dates
2024-09-23—Published
2024-01-24—Filed