Mechanical and fluid jet drilling method and apparatus

Details Mechanical and fluid jet drilling method and apparatus Mechanical and fluid jet drilling method and apparatus

E - Fixed Constructions

21

B

E21B 7/18 (2006.01) E21B 7/08 (2006.01)

Patent

CA 2693687

A device useful for conducting lateral or transverse excavating operations within a wellbore comprising a rotating drill bit with jet nozzles on a flexible arm. The arm can retract within the housing of the device during deployment within the well-bore, and can be extended from within the housing in order to conduct excavation operations. A fluid pressure source for providing ultra high pressure to the jet nozzles can be included with the device within the wellbore. The device includes a launch mechanism that supports the arm during the extended position and a positioning gear to aid during the extension and retraction phases of opera-tion of the device.

L'invention concerne un dispositif utile pour effectuer des opérations d'excavation latérale ou transversale dans un puits de forage, comprenant un foret rotatif muni de buses de jet sur un bras souple. Le bras peut se rétracter dans le boîtier du dispositif pendant un déploiement dans le puits de forage, et peut être étendu depuis l'intérieur du boîtier pour effectuer des opérations d'excavation. Une source de pression de fluide pour fournir une pression ultra élevée aux buses de jet peut être incluse dans le dispositif dans le puits de forage. Le dispositif comprend un mécanisme de lancement qui supporte le bras pendant la position étendue, et un engrenage de positionnement pour aider pendant les phases d'extension et de rétraction de l'actionnement du dispositif.

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