A method for drilling with casing

Details A method for drilling with casing A method for drilling with casing

E - Fixed Constructions

21

B

E21B 7/00 (2006.01) E21B 7/20 (2006.01) E21B 10/66 (2006.01) E21B 23/08 (2006.01)

Patent

CA 2311158

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

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