Patent ID: 7438132
Filing Date: 2008-10-21
Classification: E21B

Abstract:
1. A method of forming a wellhead, comprising: drilling a wellbore; positioning an outer casing at least partially within an upper portion of the wellbore; positioning a first tubular member within the outer casing; expanding at least a portion of the first tubular member into contact with a first portion of the interior surface of the outer casing; positioning a second tubular member within the outer casing and the first tubular member; expanding at least a portion of the second tubular member into contact with a second portion of the interior surface of the outer casing; positioning a third tubular member within the outer casing, the first tubular member, and the second tubular member; and expanding at least a portion of the third tubular member into contact with a third portion of the interior surface of the outer casing; wherein, after expanding the portions of the first, second, and third tubular members into contact with the interior portions of the outer casing, at least a portion of the second tubular member is positioned within the first tubular member, and at least a portion of the third tubular member is positioned within the first and second tubular members; and wherein, after expanding the portions of the first and second tubular members into contact with the interior portions of the outer casing, the first tubular member and the second tubular member define a passage there between; and wherein, after expanding the portions of the second and third tubular members into contact with the interior portions of the outer casing, the second tubular member and the third tubular member define a passage there between.