production tubing without moving a rig on the well to remove the tubing from the well and can be used in a well not yet perforated by adding tubing conveyed perforating apparatus below the screen application_number US 57529095 A description referring to fig1 well 10 contains casing 12 perforations 14 have been formed in the casing opposite productive zone 16 tubing string 18 has been placed in the well and may be snapped into sump packer 30 which may be previously placed in the well sump packer 30 is used to isolate production from zone 16 from lower perforated zones if any in the well pre packed screen 20 blank pipe 22 punch out or isolation plug 24 and closing sleeve 26 and hydraulic packer 28 are assembled on tubing string 18 at desired spacing distances before the equipment and tubing string are placed in the well using conventional rig techniques closing sleeve 26 is preferably placed in the open position plug 24 may be replaced with sand which is placed inside blank pipe 22 and screen 20 before the equipment is placed in the well see fig4 the equipment called for is well known in the art of well completions closing sleeve 26 is available from otis division of halliburton company or other sources ports of the sleeve are preferably large enough for passage of high concentrations of proppant as large as 10 mesh pre packed screen 20 may be obtained from johnson screen company houston screen company or from several other sources alternatively screen 20 may be a wire wrapped screen also available from a number of sources in industry the equipment is run.