Method and improvement to drilling tools comprising water passages providing great efficiency in cleaning the cutting face
US4733734A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1985 |
| Grant date | Mar 29, 1988 |
| Priority date | — |
| Expiry date | Jun 27, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/602
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method and a drilling tool are provided improving removal of spoil during drilling. The method allows the spoil to be removed from a drilling tool rotating, more especially on itself in operation, about a proper axis, or axis of the tool, said tool comprising a body a first end of which is adapted for connection to rotary drive means and the second end of which, said second end comprising water passages, defines the cutting face, the zone of said second end adjacent said axis is called central part of the tool, said tool comprises at least one nozzle. The method consists in positioning said nozzle in a water passage for producing a flow orientated towards the central part of the tool, and since the vector obtained by the orthogonal projection on a plane perpendicular to the axis of the tool of the speed of said flow in the central part of the tool is zero at any point of said central part, said vector will be qualified as effective speed vector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.