Method for drilling and lining a wellbore

Details Method for drilling and lining a wellbore Method for drilling and lining a wellbore

E - Fixed Constructions

21

B

E21B 4/04 (2006.01) E21B 4/18 (2006.01) E21B 43/10 (2006.01)

Patent

CA 2550194

A method of drilling a second wellbore section (12) from a first wellbore section (10) that is lined with a tubular liner (11) using a remotely controlled electrically powered drilling assembly that is suspended from a cable (1) and of periodically interrupting the drilling operation to extend the tubular liner into the second wellbore section without having to pull the assembly from the wellbore. The drilling assembly comprises an expansion means (2), a traction means (3), and an electrically actuated drill bit (6). An expandable liner pipe (19) is introduced into the wellbore by disconnecting a cable connection means (15) at the surface to separate the upper (13) and lower (14) lengths of cable, arranging the expandable liner pipe (19) concentrically about the upper (13) or lower (14) length of cable, reconnecting the cable connection means (15) to rejoin the upper (13) and lower (14) lengths of cable and running the expandable liner pipe (19) into the wellbore supported on a cable traction means (20) that is moveable along the cable.

L'invention concerne un procédé destiné au forage d'une seconde section de puits (12) à partir d'une première section de puits (10) recouverte d'un cuvelage (11), utilisant un ensemble de forage électrique commandé à distance, suspendu à un câble (1), le procédé permettant d'interrompre périodiquement l'opération de forage et de mettre en place le cuvelage dans la seconde section de puits sans devoir retirer l'ensemble de forage du puits. L'ensemble de forage comprend un moyen d'expansion (2), un moyen de traction (3) et un outil de forage (6) à commande électrique. Pour introduire un tube expansible (19) dans le puits, le procédé consiste à déconnecter un moyen de connexion de câble (15) en surface pour séparer les longueurs supérieure (13) et inférieure (14) du câble, à disposer le tube expansible (19) de façon concentrique autour des longueurs supérieure (13) et inférieure (14) du câble, à reconnecter le moyen de connexion de câble (15) pour relier les longueurs supérieure (13) et inférieure (14) du câble, puis à descendre le tuyau expansible (19) dans le puits à l'aide d'un moyen de traction de câble (20) qui peut être déplacé le long du câble.

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