Under-reaming and stabilizing tool for use in a borehole and...

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/32 (2006.01) E21B 10/62 (2006.01)

Patent

CA 2624697

The invention concerns an under-reaming and stabilizing tool comprising a tubular body (1) having an axial cavity (2) open outwards by at least one radial guide channel (3), a blade element (5, 6) arranged radially mobile in each radial guide channel, and wedge means (17, 18) which through an axial displacement inside the tubular body, induce a radial movement of each blade element (5, 6) as well as a drive tube (11) which is mounted inside said axial cavity so as to produce therein axial movements, the wedge means being supported at the periphery of the drive tube so as to perform between them a relative sliding movement, stop means being capable of releasably locking the wedge element on the drive tube in a locking position wherein the drive tube can produce its axial movements driving with it the wedge element.

Outil d~élargissement et de stabilisation comprenant un corps tubulaire (1) présentant une cavité axiale (2) ouverte vers l~extérieur par au moins un canal de guidage radial (3), un élément de couteau (5, 6) agencé de manière radialement déplaçable dans chaque canal de guidage radial (3), et des moyens de coin (17, 18) qui, par un déplacement axial à l~intérieur du corps tubulaire, induisent un mouvement radial de chaque élément de couteau (5, 6) ainsi qu~un tube d~entraînement (11) qui est monté à l~intérieur de ladite cavité axiale de manière à pouvoir y effectuer des déplacements axiaux, les moyens de coin étant supportés à la périphérie du tube d~entraînement de manière à pouvoir effectuer entre eux un mouvement de coulissement relatif, des moyens d~arrêt étant capables de bloquer de manière détachable l~élément de coin sur le tube d~entraînement dans une position de blocage où le tube d~entraînement peut effectuer ses déplacements axiaux en entraînant avec lui l~élément de coin.

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