Downhole drilling apparatus and method for use of same

E - Fixed Constructions – 21 – B

Patent

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E21B 7/08 (2006.01) E21B 29/06 (2006.01) E21B 33/16 (2006.01)

Patent

CA 2595026

A downhole drilling apparatus for interconnection in a casing or liner string having a drill bit disposed thereon for enabling the drilling of intersecting wellbores without removal of the drill bit is disclosed. In a disclosed embodiment, the apparatus comprises a housing having a window. A whipstock is disposed within the housing. Between the window and the whipstock is a filler. The whipstock and the filler define a central bore providing a fluid path through the apparatus. A back pressure valve may be disposed within the central bore to prevent back flow of fluids through the apparatus. Once the total depth of an initial wellbore is reached, the casing or liner string, including the apparatus, may be cemented in place. Thereafter, an intersecting wellbore may be drilled by laterally deflecting a second drill bit with the whipstock through the window of the housing.

Un appareil de forage de fond pour intersection dans une colonne de tubage est présenté. L'appareil est muni d'un trépan aux fins de forage de puits croisés sans qu'il soit nécessaire de retirer le trépan. Dans l'une des configurations proposées, l'outil comprend un carter percé d'une ouverture, un sifflet déviateur étant disposé dans le carter et une charge séparant le sifflet déviateur de l'ouverture. Le sifflet déviateur et la charge définissent un puits central qui fournit un cheminement de liquide à travers l'appareil. Une soupape de retenue de contre-pression peut être installée dans le puits central pour empêcher le refoulement de liquide à travers l'appareil. Lorsque la profondeur totale du premier puits est atteinte, la colonne de tubage peut être cimentée en place avec l'appareil. Par la suite, un second puits, sécant au premier, peut être foré en faisant dévier un second trépan au moyen du sifflet déviateur accessible par l'ouverture du carter.

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