Ball type friction resistance reduction nipple

The invention relates to a ball type friction resistance reduction nipple for drilling horizontal wells and large-displacement wells in petroleum and natural gas industrial well drilling projects. Theproblems that in the drilling process of the horizontal wells and the large-displacement wells, the friction resistance between a drill stem and a well wall is large, and the axial feeding and circumferential rotating of the drill stem are difficult are solved. By means of the technical scheme, an axial sunk groove is formed in each correcting rib of a shell, a circular blind hole is formed in the middle of each axial sunk groove, and threaded holes are formed in the two ends of each axial sunk groove; balls are installed in hemisphere grooves at the centers of the upper ends of ball bases, and the upper ends of the ball bases and the lower ends of sealing covers are connected in a threaded mode; the ball bases, the sealing covers and the balls are all installed in the circular blind holes in the middles of the a