A system for controlling fluid flow from multiple isolated producing zones in a well is provided. Components of the system are placeable in and retrievable from bottom entry side pocket mandrel sections permanently installed in a production tubing string in the well. These components include retrievable...http://www.google.de/patents/US6648073?utm_source=gb-gplus-sharePatent US6648073 - Retrievable sliding sleeve flow control valve for zonal isolation control system
