FIELD: oil and gas industry.
SUBSTANCE: drill bit comprises a body with an axis of rotation, a cutting part, connection facilities, and also a calibrating area, which is between the above cutting part and the above connection facilities. The above calibrating area includes at least three discs, radii of which stretch perpendicularly from the above axis of rotation, besides, discs are arranged at a certain distance from each other along the above axis of rotation at the above main body. Discs have circumferential surfaces, arranged in such a manner that discs are limited with an imaginary 3D surface of conical cross section, the diameter of which perpendicularly to the axis of rotation varies in a disproportionate manner along the above axis as the function of distance from the cutting part.
EFFECT: stable guided drilling, reduced losses of energy, lower friction forces during bit rotation.
21 cl, 6 dwg
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