Drilling head for reboring a stuck valve

Details Drilling head for reboring a stuck valve Drilling head for reboring a stuck valve

E - Fixed Constructions

21

B

E21B 11/00 (2006.01) E21B 10/26 (2006.01) E21B 29/00 (2006.01) E21B 34/06 (2006.01)

Patent

CA 2685063

The present invention relates to a drilling head (2) for reboring a stuck valve (35) or drilling into the formation downhole (36). The invention furthermore relates to a drilling tool (1) comprising the drilling head and a driving unit (9). The drilling head comprises a hole saw (28) beside a drill bit for cutting out a piece (37) from the stuck valve. Furthermore, the invention relates to a drilling system comprising the drilling tool and a driving tool for moving the drilling tool downhole; a method of drilling; and a use of the drilling head.

L'invention porte sur une tête de reforage d'une soupape coincée ou de forage dans une formation en fond de puits. L'invention porte également sur un outil de forage comprenant une tête de forage et son unité d'entraînement. La tête de forage comprend une scie cloche et un trépan permettant de découper une partie de la soupape coincée. L'invention porte en outre: sur un système de forage comprenant l'outil de forage et son outil d'entraînement en fond de puits; sur une méthode de forage; et sur l'utilisation d'une tête de forage.

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