Method for drilling a wellbore using a bi-center drill bit

Details Method for drilling a wellbore using a bi-center drill bit Method for drilling a wellbore using a bi-center drill bit

E - Fixed Constructions

21

B

E21B 7/04 (2006.01) E21B 7/06 (2006.01)

Patent

CA 2353351

A method is disclosed for drilling a wellbore. The method includes operating a turbine-type mud motor having a bi-center drill bit coupled to it, and applying an axial force to the bit which is selected so that the bit drill:, in a directionally stable manner. In one embodiment, the motor is a steerable motor operated to maintain a selected trajectory of the wellbore.

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