Method of drilling an enlarged sidetracked well bore

Details Method of drilling an enlarged sidetracked well bore Method of drilling an enlarged sidetracked well bore

E - Fixed Constructions

21

B

E21B 29/06 (2006.01)

Patent

CA 2551923

A method of milling a window through a casing in a primary well bore and drilling an enlarged sidetracked well bore comprises running into the primary well bore a drilling assembly comprising at least one cutting apparatus adapted to drill an enlarged borehole, milling a window through the casing, and drilling the enlarged sidetracked well bore, wherein the milling and drilling steps are performed in one trip into the primary well bore. A drilling assembly comprises at least one cutting apparatus operable to drill an enlarged borehole, wherein the drilling assembly is operable to mill a window through a casing in a primary well bore and drill an enlarged sidetracked well bore through the window in one trip into the primary well bore. 26

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