Fluid jet drilling tool

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 7/18 (2006.01) E21B 10/60 (2006.01)

Patent

CA 2544093

The invention features an excavating device (1) for excavating a hole (2) in a geological formation, which excavating device (1) comprises: a body rotatable inside the hole (2) along a rotation axis; a nozzle (7) arranged on the body to jet a stream of an abrasive fluid (9) onto a surface (4) in the geological formation in order to generate the hole (2), wherein the stream has at least an radial velocity component and one parallel to the rotation axis. The excavating device further comprises: a distance holder (8, 38) arranged on the body to ensure a predefined distance between the nozzle (7) outlet and the surface (4); wherein the distance holder (8, 38) has a trumpet shaped inner surface section (12) facing the geological formation, which trumpet shaped inner surface section (12) is provided with an opening (16) for allowing the stream (9) to pass through. The opening (16) in the trumpet shaped inner surface section (12) is defined by a recess (15) that is formed in the inner surface (12) of the wall of the distance holder (8, 38), whereby the nozzle is arranged to discharge in the recess. The invention also features a distance holder (8, 38) such as described above.

L'invention concerne une excavatrice (1) de trou (2) dans une formation géologique, qui comprend: un corps rotatif dans le trou (2) le long d'un axe de rotation; une buse (7) sur le corps pour la pulvérisation de jet de fluide abrasif (9) vers une surface (4) dans ladite formation pour creuser le trou (2), ce jet ayant au moins une composante de vitesse radiale et une autre parallèle à l'axe de rotation. L'excavatrice comprend encore: un système de maintien de distance (8, 38), sur le corps, pour maintenir une distance préétablie entre la sortie de buse (7) et la surface (4); ledit système (8, 38) comporte une partie de surface interne en forme trompette (12), qui fait face à la formation et qui comprend une ouverture (16) pour le passage du jet (9), définie par une cavité (15) formée dans la surface interne (12) de la paroi du système de maintien (8, 38), moyennant quoi la buse se déverse dans la cavité. L'invention concerne également un système de maintien de distance (8, 38) correspondant à la description susmentionnée.

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