of the energy conductors of umbilicals 106 downhole of sand control screen assembly 136 lower completion assembly 100 includes a seal bore subassembly 148 operable to provide an internal sealing surface downhole of seal bore subassembly 148 lower completion assembly 100 includes a packer assembly 150 having one or more elements 152 for establishing a sealing and gripping relationship with casing 40 together packer assembly 130 sand control screen assembly 136 and packer assembly 150 may be referred to as a zonal isolation subassembly that is associated with zone 62 which is depicted as being gravel packed as best seen in fig2 g lower completion assembly 100 includes a seal bore subassembly 154 operable to provide an internal sealing surface as best seen in fig2 h downhole of seal bore subassembly 154 lower completion assembly 100 includes a sand control screen assembly 156 in the illustrated embodiment sand control screen assembly 156 includes two filter media 158 160 a production sleeve 162 and a frac sleeve 164 production sleeve 162 and frac sleeve 164 may be operated mechanically electrically hydraulically or the like via local or remote operations to selectively allow or disallow fluid flow therethrough also as illustrated sand control screen assembly 156 has a plurality of sensors 166 that are operably associated with one or more of the energy conductors of umbilicals 106 downhole of sand control screen assembly 156 lower completion assembly 100 includes a seal bore subassembly 168 operable to provide an internal sealing surface downhole of seal bore subassembly 168 lower completion assembly 100 includes a.