Patent ID: 7513313

Claim:
A bottom plug assembly for use in connection with an apparatus for forming a mono diameter wellbore casing, the apparatus of the type using an expandable tubular member carried into a wellbore on a tubular support and expanded with an expansion cone connected to the tubular support, the bottom plus assembly comprising: an expandable packer coupled to and positioned below the expansion cone; an anchor device coupled to the tubular support for anchoring the expandable tubular member to the tubular support; a packer setting mechanism coupled between the expansion cone and the expandable packer for expanding the expandable packer and sealingly setting the expandable packer in an expanded portion of the expandable tubular member; and a release mechanism coupled between the expansion cone and the expandable packer for releasing the expandable packer from the expansion cone so that fluid pumped into the expandable tubular member between the expansion cone and the sealed and set expandable packer will force the expansion cone into and through the expandable tubular member to expand the expandable tubular member.