A method for drilling with casing

E - Fixed Constructions – 21 – B

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E21B 7/20 (2006.01) E21B 10/66 (2006.01) E21B 23/08 (2006.01)

Patent

CA 2411856

A method for drilling boreholes using casing (16) as the drill string and for advancing a casing string toward the bottom of the borehole is described. In the method, the drilling assembly (26) is used as a guide over which the drill string (16) is advanced toward the bottom of the borehole prior to removing the drilling assembly from the wellbore.

L'invention concerne un procédé pour forer un trou de forage, dans lequel le tubage (16) est utilisé en tant que train de forage et pour faire avancer la colonne de tubage jusqu'au fond du trou de forage. Dans le procédé de l'invention, ledit ensemble de forage (26) est utilisé comme guide sur lequel le train de forage (16) est avancé en direction du fond du trou de forage, avant le retrait dudit ensemble de forage du trou de forage.

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