A downhole drilling underreamer
By designing an independently swingable cutting unit and an internal flushing fluid channel on the reaming drill bit for downhole drilling, the problem of frequent drill bit replacement has been solved, enabling flexible adjustment of the cutting radius and efficient reaming, thereby improving downhole drilling efficiency and borehole accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 129 EXPLORATION TEAM GENERAL ADMINISTRATION OF CHINA COAL GEOLOGY
- Filing Date
- 2026-05-06
- Publication Date
- 2026-07-17
AI Technical Summary
The cutting radius of existing downhole drilling reaming bits is fixed, requiring frequent bit replacements to adapt to different hole diameter requirements, resulting in cumbersome operation, long time consumption, high labor intensity and low efficiency.
A hole-reaming drill bit for downhole drilling is designed, which adopts multiple cutting units arranged sequentially along the drill bit axis. The length of the cutting units increases step by step and can swing independently. Combined with the mounting groove and threaded hole structure on the drill bit body, flexible cutting radius adjustment can be achieved. Cutting is assisted by the internal flushing fluid channel to ensure cutting stability and efficiency.
It eliminates the need for frequent drill bit replacements, reduces manual labor, improves the efficiency of reaming operations, ensures reaming quality and safety, reduces cutting tooth wear, prevents rock powder accumulation, and enhances drilling efficiency and hole diameter accuracy.
Smart Images
Figure CN122407078A_ABST