Divergent fluid nozzle for drilling tool
AssigneesTotal SA, Diamant Boart Stratabit S.A.
InventorsAlain Besson, Bernard Ponineau
Life of this patent
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Abstract
A drilling fluid nozzle 12 mounted in the end of an earth drilling tool 10 has a flow channel defined by a surrounding wall 16 which diverges at an angle of 30.degree. or less, such that the exiting fluid "adheres" to the wall in a laminar manner due to the Coanda effect. This configuration minimizes clogging, and implements ready unclogging.
Claims4
A drilling fluid nozzle adapted to be mounted in and for use with a one-piece borehole drilling bit (10), said nozzle comprising a drilling fluid flow channel defined by a surrounding wall (16), wherein said wall diverges from an entry end of the channel disposed in an interior of the bit to an exit end of the channel disposed at an exterior surface of the nozzle at an angle whereat the drilling fluid flows along in contact with the wall due to a Coanda effect, without the generation of any swirling counter-currents.
Dependencies are inferred from the claim text.