A system for enhancing oil production and reducing contamination thereof by such things as water breakthrough in unconsolidated horizontal wells comprises gravel packing, zonal isolation and selective flow control in combination. The glass dish comprises a substantially homogenous glass body, a channel formed in a bottom surface of the glass body and a silicone support. The window arrangement is integrated into the body and transfers a first signal and receives a second signal. Each memory cell is adapted to trap an amount of charge indicative of a programming state. Discontinuities detected by the user or software indicate faulty spray nozzles and may trigger remedial action. The tube coil may be maintained in a desired dimensional geometry by means of a core structure around which the tube coil is positioned.