A directional casing drilling system including a casing string for rotation of a drill bit, a shaft coupled to the casing string, and a sleeve having pads that are hydraulically extensible. The sleeve may be positioned about a portion of the shaft. The invention may also include a tube connecting the sleeve to the drill collar, the tube adapted to conduct drilling fluid, and a valve system adapted to operatively conduct at least a portion of the drilling fluid to the pads whereby the pads move between an extended position and a retracted position.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of U.S. patent application Ser. No. 10/140,192 filed on May 6, 2002 now U.S. Pat. No. 6,840,336, which claims priority pursuant to U.S. Provisional Application No. 60/296,020 filed on Jun. 5, 2001, and U.S. patent application Ser. No. 10/122,108 filed on Apr. 12, 2002, which claims priority pursuant to U.S. Provisional Application No. 60/289,771 filed on May 9, 2001.
