Patent ID: 8567491
Filing Date: 2013-10-29
Classification: E21B

Abstract:
1. A device for lining the wall of a wellbore as said wellbore is being drilled through a subterranean formation using a drill string having a drill bit on a lower end of the drill string, the device comprising: (a) a receptacle for a cylindrically gathered pack of flexible tubing supported around the outside of the drill string at or near the lower end thereof on a plurality of bearings thereby allowing the receptacle to remain stationary while the drill string is rotated; (b) a radially expandable locking device attachable either directly or indirectly to a first end of the tubing of the gathered pack, said radially expandable locking device being expanded against the wellbore wall to lock the first end of the flexible tubing in place in the wellbore such that in use movement of the drill string through the wellbore as the wellbore is being drilled causes the flexible tubing to be withdrawn from the cylindrically gathered pack and to be turned inside out thereby providing a liner for the wellbore wall with an outer surface of the tubing of the cylindrically gathered pack forming an inner surface of the liner; and (c) at least one conduit having at least one inlet upstream of the receptacle and at least one outlet downstream of the receptacle; wherein at least one pump is located at least partly in the conduit or abutting said inlet or outlet thereof, and pumps the drilling fluid so that a fluid pressure inside the liner is greater than a fluid pressure at the drill bit.