Patent ID: 6848504

Claim:
An apparatus for connecting a main well bore and a lateral well bore comprising: a primary well bore insert comprising: an upper casing having an inside diameter; a lower casing; a lateral opening formed below the upper casing; a key slot formed above the lateral opening; and a coupling stock between the upper and lower casings having an inner diameter greater than the inner diameter of the upper casing, wherein the coupling stock comprises a guide rail opposite the lateral opening extending longitudinally on an inner surface of the coupling stock, the guide rail having a mounting surface of a predetermined configuration; and a tieback liner comprising: a bent joint; a liner attached to the bent joint for extending into the lateral well bore; a tieback junction having an opening configured to correspond to the lateral opening in the tubular insert; a swivel interposed between the liner and the tieback junction, said swivel being attached to an end of the liner opposite the end attached to the bent joint; and a snap sleeve for engagement with the guide rail and the inner surface of the coupling stock, the snap sleeve being attached to an end of the tieback junction opposite the end attached to the swivel and comprising: a mounting surface having a configuration corresponding to the predetermined configuration of the guide rail mounting surface, an outer diameter equal to the inner diameter of the coupling stock, an inner diameter not less than the inner diameter of the upper casing, and a lateral opening configured to correspond to a portion of the liner opening.