Retrievable through tubing whipstock apparatus having...

Details Retrievable through tubing whipstock apparatus having... Retrievable through tubing whipstock apparatus having...

E - Fixed Constructions

21

B

E21B 7/06 (2006.01) E21B 4/02 (2006.01) E21B 23/04 (2006.01) E21B 29/06 (2006.01)

Patent

CA 2480259

A one-trip through tubing window milling system that prevents a downhole motor from undesirably turning during anchoring of a whipstock is disclosed. The whipstock is delivery with the mill and downhole motor (22) in a downhole assembly which further includes MWD equipment for proper whipstock orientation. The entire assembly is run through tubing and the MWD equipment (14) orients the whipstock (28). A motor lock (24) prevents the downhole motor (22) from turning as fluid pressure is applied to properly anchor the whipstock below the production tubing. The motor lock (24) is defeated and the milling commenced using the downhole motor. At the conclusion of the window milling, the bottom hole assembly, including the mill, is removed and a retrieving tool (86) releases the whipstock for retrieval through the production tubing (30).

L'invention concerne un système de fraisage de fenêtre de tubage en une seule manoeuvre. Le biseau de déflexion est fourni avec la fraise et un moteur fond de trou (22) dans un ensemble fond de trou comprenant également un dispositif de mesure de fond pendant le forage (MWD) permettant d'orienter de façon adéquate le biseau de déflexion. Tout l'ensemble passe à travers le tubage et le dispositif de mesure MWD (14) oriente le biseau de déflexion (28). Un verrouillage du moteur (24) empêche le moteur de fond de trou (22) de tourner lorsqu'une pression fluide est appliquée en vue d'ancrer de manière adéquate le biseau de déflexion au-dessous du tubage de production. Le verrouillage du moteur (24) est mis en échec et le fraisage débuté au moyen du moteur de fond de trou. Lorsque le fraisage de fenêtre est achevé, l'ensemble de fond de trou, y compris la fraise, est retiré et un outil d'extraction (86) libère le biseau de déflexion en vue de l'extraire par le biais du tubage de production (30).

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