Patent ID: 7413020
Filing Date: 2008-08-19
Classification: E21B

Abstract:
1. A method of forming a cased well, comprising: lowering a first tubular having an earth removal member operatively attached to its lower end into a formation to form a first wellbore having a first length, at least a portion of the first tubular forming part of an undercut drillable cementing shoe, wherein the first tubular within the cementing shoe has, prior to the lowering, a first section with an enlarged inner diameter relative to a second section of the first tubular; locating at least a portion of a second tubular within the first tubular, at least a portion of the second tubular comprising casing; introducing a physically alterable bonding material into an annulus between the first tubular and the formation therearound; and expanding at least the portion of the second tubular against the first section of the first tubular so that at least the portion of the second tubular has an inner diameter at least as large as a smallest inner diameter portion of the first tubular.