valve 20 using tubing pressure after the upper completion 16 is reinstalled this will be addressed further hereunder in order to restore production another system 110 is attached at a downhole end of upper completion 16 and run in the hole this is illustrated in fig3 the original system 10 has components such as packer 14 valves 20 and 22 and control lines 24 are seen at the bottom of the drawing and a new system 110 stackable on the last is shown the new system 110 includes a packer 114 valve 120 valve 122 lines 124 stroker 13 esp 118 and releasable hydraulic line device 128 in essence each of the components of system 10 is duplicated in system 110 moreover it should be understood that the process of pulling out and stabbing in with new systems can go on ad infinitum or at least until practicality dictates otherwise since the valves 20 and 22 will be in the closed position having been intentionally closed upon preparing to retrieve the upper completion 16 they will need to be opened upon installation of the new system 110 this is accomplished by stabbing a mechanical shiftdown 142 into valve 22 and setting packer 114 the mechanical shiftdown 142 mechanically shifts the valve 22 to the open position it should be pointed out that in this embodiment the mechanical shiftdown 142 does not seal to the valve 22 and as such the inside of the upper completion 16 is in.