Drilling with casing

Details Drilling with casing Drilling with casing

E - Fixed Constructions

21

B

E21B 7/08 (2006.01) E21B 7/06 (2006.01) E21B 7/20 (2006.01) E21B 10/66 (2006.01)

Patent

CA 2271401

A method and apparatus for drilling directional wellbores using a casing string as a drill stem is taught. A retrievable bit is mounted at an end of the casing string and either a mud motor with a bent housing and/or bent sub or a rotary steerable tool is used to direct the bit to drill directionally.

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