Patent ID: 7090022

Claim:
A method of forming a wellbore junction in a subterranean well, the method comprising the steps of: drilling a first wellbore; installing a casing string in the first wellbore; drilling a second wellbore extending outwardly from the first wellbore; aligning a window formed through a sidewall of the casing string with the second wellbore; installing a liner string through the window and into the second wellbore, a first portion of the liner string extending longitudinally within the casing string, a second portion of the liner string extending laterally across an interior of the casing string, and a third portion of the liner string extending within the second wellbore; and expanding the liner string radially outward, the expanding step including expanding the liner string first portion, thereby sealing the liner string first portion within the casing string, and the expanding step further including recessing the liner string into an inner wall of the casing string.