A method for drilling with casing

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 7/20 (2006.01) E21B 10/64 (2006.01)

Patent

CA 2661956

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.

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