Patent ID: 9593536
Date: 2017-03-14
CPC Classifications: E21B

Claim:
1. A casing drilling system, comprising: a combination conduit comprising a casing and a pipe inside the casing; a first adapter having a flow diverter to redirect at least flow of drilling fluid returning from a bottom of a wellbore to an interior of the pipe; a second adapter having a flow diverter to redirect flow of drilling fluid into an upper end of the combination conduit through the annular space between the pipe and the conduit, the second adapter having a rotatable fluid connection between the at least one of the interior of the pipe and the annular space and a rotationally fixed fluid outlet for the returning drilling fluid; and a casing chuck having means to support axial loading of the casing and a slidable conduit operable to expose an uppermost end of the casing and a connection between the second adapter and an uppermost end of the pipe.