Device and method of lining a wellbore
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United States of America Patent
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Oct 29, 2013
Grant Date -
May 26, 2011
app pub date -
Mar 18, 2009
filing date -
Mar 20, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
Device for lining the wall of a wellbore as it is being drilled using a drill string having a drill bit on the lower end thereof. The device has a receptacle for a cylindrically gathered pack of flexible tubing capable of being supported around the outside of the drill string near the lower end thereof on a plurality of bearings, a radially expandable locking device attachable to one end of the flexible tubing and being capable of being expanded against the wellbore wall to lock the end of the flexible tubing in place in the wellbore, and a conduit having an inlet upstream of the receptacle and an outlet downstream of the receptacle. A pump is located in the conduit or abutting the 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.
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