БУРОВОЕ ДОЛОТО СО СТАБИЛИЗАТОРОМ-КАЛИБРАТОРОМ

摘要

FIELD: well drilling tools, particularly cone bits. ^ SUBSTANCE: drilling bit comprises body with bosses provided with calibrating cutting members, which are symmetric to calibrating points of inverse cones and to each other. The calibrating cutting members are made as continuous blades or rows of separate teeth having cutting edges facing bit rotation direction. Teeth apexes are arranged in plane defined by imaginary cylindrical surface having diameter equal to that of drilling bit. Wear-resistant members with cutting edges are arranged in each body boss and made as one or several elongated serially arranged blades or as one or several teeth or diamond insert rows. Cutting edges of one or several members are arranged along imaginary generatrix of cylindrical surface having diameter equal to drilling bit diameter or inclined at an angle equal to 0°-30° to the generatrix in clockwise or counterclockwise direction. ^ EFFECT: decreased radial cone bit runout and provision of constant well diameter due to active well hole reaming at drill body level. ^ 3 cl, 12 dwg