| 摘要 |
A device and method for lining the wall of a wellbore (1) as it is being drilled through a subterranean formation (2) using a drill string having a drill bit on the lower end thereof. The device comprises: (a) a receptacle (5) for a cylindrically gathered pack of flexible tubing capable of being supported around the outside of the drill string at or near the lower end thereof on a plurality of bearings (7) thereby allowing the receptacle (5) to remain stationary while the drill string is rotated; and (b) a radially expandable locking means (8) having means for directly or indirectly attaching a first end of the tubing of the gathered pack, said radially expandable locking means (8) being capable of being expanded against the wellbore wall so as 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of the drill string through the wellbore (1) as it is being drilled is capable of causing the flexible tubing to be withdrawn from the cylindrically gathered pack and to be turned inside out thereby providing a liner (15) for the wellbore wall with the outer surface of the tubing of the cylindrically gathered pack forming the inner surface of the liner; and (c) at least one conduit (11) having at least one inlet (13) upstream of the receptacle and at least one outlet (14) downstream of the receptacle; characterised in that at least one pump (16) is located at least partly in the conduit (11) or abutting said inlet (13) or outlet (14) thereof.
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