Drill rod retrieval device

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 23/02 (2006.01) E21B 31/20 (2006.01) E21C 37/00 (2006.01)

Patent

CA 2014217

A drill rod retrieval device for recovering hollow drill rods that are connectable end to end by coupling means from a drill shaft. The device comprises an internally threaded female section formed within the hollow interior of each of the drill rods and a retrieval member comprising a threaded male member adapted to be inserted down the drill shaft and engaged in the internally threaded female section of an uppermost drill rod. The rod and the retrieval member are threadably engaged one with the other whereupon the retrieval member is removed from the drill shaft with the uppermost drill rod and any additional drill rods connected to the uppermost drill rod.

Dispositif de récupération des tiges de forage servant à récupérer les tiges de forage creuses pouvant être raccordées bout à bout à l'aide d'un manchon à partir du forage. Le dispositif comprend une section femelle à filetage intérieur se trouvant dans la partie creuse de chacune des tiges de forage et un dispositif de récupération comprenant une partie mâle filetée conçue pour être insérée et descendue dans le forage et engagée dans la section femelle à filetage intérieur de la tige de forage supérieure. La tige et le dispositif de récupération sont engagés l'un dans l'autre à l'aide de filets, sur quoi le dispositif de récupération est retiré du forage en compagnie de la tige de forage supérieure et des autres tiges de forage raccordées à la tige de forage supérieure.

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