Apparatus for removing an item from a wellbore

Details Apparatus for removing an item from a wellbore Apparatus for removing an item from a wellbore

E - Fixed Constructions

21

B

E21B 31/16 (2006.01) E21B 23/00 (2006.01)

Patent

CA 2286187

An apparatus for removing an item from a wellbore, said apparatus comprising a bushing (30) having a hollow generally cylindrical shaped body with a bottom, a top and a bore extending from top to bottom, a mandrel (20) extending into said bore, at least one key (31) on one of the mandrel (20) and the bushing (30), a slot system (50) on the other of said mandrel (20) of said bushing (30), said key (31) projecting into said slot system (50), engagement apparatus (18) connected to said mandrel (20) for engaging said item, and milling apparatus (17) connected to the bottom of the bushing (30), wherein said slot system (50) has a top, a bottom, and a series of interconnected slots through which said at least one key (31) is movable, said series of interconnecting slots including exit means for permitting movement of said at least one key (31) out from said slot system (50) thereby permitting free movement of said bushing (30) relative to said mandrel (20).

L'invention concerne un appareil de retrait d'un article d'un trou de forage, l'appareil comprenant: une douille (30) formée d'un corps creux généralement cylindrique et comportant une base, un sommet, et un trou s'étendant du sommet à la base; un mandrin (20) s'étendant dans le trou; au moins une clavette (31) située sur le mandrin (20) ou la douille (30); un système de fente (50) sur le mandrin (20) ou la douille (30) où ne se trouve pas la clavette, la clavette (31) se projetant dans le système de fente (50); un dispositif d'engrènement (18) relié au mandrin (20) et destiné à s'engrener avec l'article; et un appareil à fraiser (17) relié à la base de la douille (30). Le système de fente (50) comporte un sommet, une base, et une série de fentes reliées entre elles à travers lesquelles la clavette (31) est amovible, la série de fentes reliées entre elles comprenant un dispositif de sortie destiné à permettre un déplacement de la clavette (31) hors du système de fente (50), ce qui permet un déplacement libre de la douille (30) par rapport au mandrin (20).

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