| 摘要 |
<p>A vibratory drilling tool for use coupling to a drill string in a borehole in downhole drilling operations has a tool body having a fluid flow path extending along a longitudinal axis there through, a first pin end and an opposite box end. A cam body portion extending longitudinally along the length of said tool has a generally smooth cam arc section on an opening side with at least one elongated flat surface extending longitudinally along a closing side of the cam body portion from a pin end tapering shoulder to a box end tapering shoulder. The cam body portion when coupled to said drill string lifts a generally horizontal drill pipe section of the drill string vertically in the borehole as the drill pipe section is rotated in the borehole.</p> |
