| 摘要 |
The invention relates to a tool for use in wellbore drilling, suitable for use with a drill string for drilling a wellbore having an inner wall, the tool comprising means for generating particles of solid material from the formed inner wall of a drilled wellbore, and means for directing the generated particles to the inner wall of the wellbore. Also claimed is a method of forming a layer of solid particles on the inner wall of a wellbore drilled by such a drill string. The tool may comprise a cylindrical body 9 and abrasive elements 11 for generating particles from the wellbore wall. The particles may be mechanically directed to the wellbore walls by a roller device 30 comprising vanes 32, the distal ends of which form smearing surfaces to force the particles to the inner wall. |
