For many multi lateral well applications, achieving a mechanically stable junction between the main well bore and a branch is critical, not only to meeting pressure integrity requirements during the initial completion, but also to maintaining control of individual lateral sections during future interventions. During 1996, three different completions systems designed to allow for a true hydraulic seal and/or control at the junction in a multilateral well will have been field tested in the North Sea/World. This paper describes the three systems, including the advantages and disadvantages of each, and will summarise their deployment and field performance.

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