Isolation system and gravel pack assembly

摘要: An isolation system is disclosed which includes a production screen and an internal pipe sealed with the at proximal distal ends, sleeve slideably coupled pipe. The defines least one port aperture, moveable between open position in aperture are communication to permit fluid flow therethrough, closed not prevented. manipulated by service string multi-action shifting tool opened positions. Also gravel packer method of operation incorporating system, as well assembly useful therewith.