System for isolating multiple gravel packed zones in wells

摘要: A gravel pack screen assembly adapted to produce fluids from two spaced apart zones of interest through packing surrounding screens includes a sub interposed in the between and having reservoir for discharging quantity permeability reducing material into layer intermediate each screens. The is operable discharge response movement washpipe or like within move an actuator member cause closure uncover ports communication with reservoir. transverse surface projecting central bore be engaged by deflectable collet fingers formed on similar insertable effect operation its material.