subterranean formation f for the purpose of recovering hydrocarbons and at least a portion of the well bore 20 may be lined with casing 25 that is cemented 30 into position against the formation f in a conventional manner perforations 35 extend through the casing 25 and cement 30 into a lowermost producing zone a in the formation f to provide a path for the flow of fluids from the producing zone a into the well bore 20 the completion system 10 may take a variety of different forms in the embodiment depicted in fig1 the completion system 10 comprises a plurality of gas lift valves 40 spaced along a production tubing 50 a ported velocity tube 100 referred to hereinafter as pvt 100 a production packer 60 and an inner tubing string 70 suspended from the pvt 100 and extending through the production packer 60 to form a flow annulus 80 within the packer 60 in an embodiment an injection valve 90 and a bull plug 95 may also be connected toward the lower end of the inner tubing string 70 which terminates adjacent the perforations 35 while the completion system 10 shown in fig1 depicts a quantity of five gas lift valves 40 one of ordinary skill in the art will readily appreciate that the number and spacing of gas lift valves 40 may change without departing from the scope of the present invention additional components may also be provided as part of the completion system 10 in an embodiment the production packer 60 is a standard double grip production packer such as the m1 x u2122 packer or the versalock u2122 packer both available from smith international inc of houston tex the production packer 60 is set against the casing 25 to thereby.