A method of forming a bore

Details A method of forming a bore A method of forming a bore

E - Fixed Constructions

21

B

E21B 7/20 (2006.01) E21B 29/06 (2006.01) E21B 33/14 (2006.01) E21B 43/10 (2006.01)

Patent

CA 2468602

A method of forming a supported subterranean well bore in which, in one disclosed embodiment, a first drill bit is mounted on a first string of casing tubulars via a steerable tool, and the drill bit is used to form a first bore. Upon reaching the required depth the casing string is cemented in place to support the formed bore and a second drill bit is mounted on a second casing string and is inserted into the first casing string. The second drill bit is used to drill through the wall of the first casing string and proceed to form a second, deeper bore. Once the second drill bit has reached the required depth, the second casing string is cemented in place to support the second bore.

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