EXPANDABLE TUBULAR HAVING IMPROVED POLISHED BORE RECEPTACLE PROTECTION

摘要

The present invention provides an expandable tubular having improved polishe d bore receptacle protection. The present invention further provides methods f or completing a wellbore through the use of an expandable string of casing havi ng improved polished bore receptacle protection. In one aspect, the invention includes a liner member (200) having an expandable section (225), and a polished bore receptacle (25) positioned below the expandable section. The expandable section is run into a wellbore (205), and is positioned to overla p with the bottom portion of a string of casing (210) already set within the wellbore. The expandable section is then expanded into frictional engagement with the surrounding casing. The expandable section optionally includes at least one sealing member (260) and at least one slip member (270) on the out er surface. In one aspect, a transition section (275) is provided between the expandable section and the polished bore receptacle. The transition section defines a sloped inner diameter which provides further protection for the sealing surfaces of the polished bore receptacle as tools, fluid, and tubula rs are transited downhole through the polished bore receptacle.