E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/20 (2006.01) E21B 7/06 (2006.01) E21B 17/10 (2006.01) E21B 25/00 (2006.01)
Patent
CA 2045059
ABSTRACT OF THE INVENTION The present invention comprises a method and apparatus for simultaneously drilling and casing a wellbore. More specifically, the apparatus comprises and outer conduit string containing an inner drill string carrying a bit capable of drilling a wellbore of greater diameter than the outer string. The drill string may be adapted to drill a nonlinear wellbore by offsetting the drill bit from the longitudinal axis of the outer string, and the drill bit is preferably retractable to permit withdrawal of the drill string after the wellbore is completed, leaving the outer string of casing or liner in place. The wellbore is drilled by rotating the drill bit and advancing the drill string by pushing from the surface, and the outer string is advanced by being pulled along by the drill string.
Aslakson John K.
Hatten James L.
Jacques Gary E.
Karlsson Haraldur
Baker Hughes Incorporated
Borden Ladner Gervais Llp
Energy Ventures Inc.
Evi Cherrington Environmental Inc.
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