Downhole milling device

Details Downhole milling device Downhole milling device

E - Fixed Constructions

21

B

E21B 29/06 (2006.01) E21B 4/16 (2006.01) E21B 7/28 (2006.01) E21B 27/00 (2006.01) E21B 27/02 (2006.01)

Patent

CA 2334150

A device for performing milling operations in an underground borehole comprises a toppling head (2) which is pivotably secured to a stator housing (1) and which is equipped with one or more rotatable mills (3, 4) which are in use pivoted together with the toppling head (2) into an extended position from the stator housing (1) to mill a window in a surrounding casing (23), or to underream the wellbore whilst the stator housing is rotated in the wellbore.

Dispositif servant à exécuter des opérations de fraisage dans un trou de sondage souterrain et comprenant une tête de fraisage (2) fixée rotative au boîtier (1) d'un stator et comportant une ou plusieurs fraises rotatives (3, 4) qui, en fonctionnement, tournent simultanément, la tête de fraisage (2) se trouvant alors en position d'extension depuis le boîtier (1) du stator afin de fraiser une fenêtre dans un tubage (23) environnant ou d'élargir le trou de sondage, tandis que le boîtier du stator tourne dans ce trou de sondage.

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