Patent ID: 7275595
Filing Date: 2007-10-02
Classification: E21B

Abstract:
1. A fluid isolation system for use in gravel pack operations in a subterranean well comprising: a work string having an inner wall; a lower plug that can move within the work string while sealingly engaged to the inner wall of the work string, wherein the lower plug has a lower frangible diaphragm covering a central passageway through the lower plug; an upper plug that can move within the work string while sealingly engaged to the inner wall of the work string; wherein the upper plug has an upper frangible diaphragm covering a central passageway through the upper plug; a plug catcher mounted to the work string at some desired location in the well; and a crossover mounted to the work string below the plug catcher; in which the fluid between the lower plug and the upper plug is isolated from the fluid above the upper plug and below the lower plug.