Patent ID: 7131498
Filing Date: 2006-11-07
Classification: E21B

Abstract:
1. A method for providing a casing in a wellbore wherein another casing of the same internal diameter may be provided in the wellbore below the casing and further providing an overlap between the casing and the other casing sufficient to provide a hydraulic seal between the two casings, the method comprising the steps of: placing a casing within the wellbore wherein the casing has a smaller outside diameter than a final inside diameter of the casing; placing an expandable mandrel within the casing, the expandable mandrel suspended from a drill string; converting the expandable mandrel to a first expansion diameter while the expandable mandrel is within the casing wherein the first expansion diameter is about the final inside diameter plus twice the thickness of the final casing; forcing the expanded mandrel through a lower portion of the casing while the expandable mandrel is of the first expansion diameter; converting the expandable mandrel to a second expansion diameter, wherein the second expansion diameter is about the final inside diameter; and forcing the expanded mandrel through an upper portion of the casing while the expandable mandrel is of the second expansion diameter.