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AssigneeInstitut Francais du Petrole
InventorsChristian Bardin, Henri Cholet
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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.
A method for improving the scavaging of cuttings from a drill tool rotating, in operation, about an axis of the tool, said tool comprising a body having a first end adapted for connection to rotary drive means and having a second end providing a cutting face, said second end having water passages, a zone of said second end surrounding said axis forming the central part of the tool, said tool comprising at least one nozzle wherein said nozzle is positioned in and in fluid communication with a water passage for producing a flow oriented towards the central part of the tool, the vector of the speed of flow obtained by the orthogonal projection on a plane perpendicular to the axis of the tool in the central part of the tool being different from zero at any point on said central part, said vector forming an effective speed vector.
Dependencies are inferred from the claim text.