BOTTOMHOLE DRIVE SPINDLE Russian patent published in 2008 - IPC E21B4/02 

FIELD: drilling equipment, particularly spindles adapted to drill oil and gas wells.

SUBSTANCE: bottomhole drive spindle comprises body and shaft assemblies. Body assembly includes body, radial supports installed in the body and threadedly connected to the body by compression thereof between two support ledges created by ends of two subs or by inner body ledge and sub end. Radial supports have working surfaces. Body receives adjustment and spacing rings, as well as body axial support members. Shaft assembly comprises shaft, radial support bushes installed on the shaft and threadedly connected to the shaft by axial compression thereof between support ledges, namely between support shaft ledge and support ledge defined by half-coupling end provided with flushing channels. The shaft assembly has radial support bushes with working surfaces, inner adjusting rings and spacing rings, as well as inner axial support members. One radial support bush and/or radial support has annular extension for radial support bush and/or radial support securing to shaft and/or body assembly.

EFFECT: increased reliability, extended service life of bottomhole drive spindles and bottomhole drives.

3 cl, 2 dwg