in the art so long as there is a pressure valve responsive in each of the valve and passageway systems with appropriate predetermined pressure operational valves for release so that each of the valve systems is timed to open at nearly the same time or from the bottom packer upwardly it is contemplated that the valves in the upper packer means can have different values of pressure operation but the operation of the valves are not a critical factor as the flow rate of inflation is the material factor the flow rate of inflation in the packer 71 is controlled by a flow choke c1 in the passageway system 78 and the flow rate of inflation in the packer 70 is controlled by a flow choke c2 in the passageway system 77 so that the flow rate of the fluid to inflate the lowermost packer element 76 is greater than the flow rate of the fluid to inflate the next above packer element 75 the choke c1 and c2 may be simple orifices for sizing the diameter of flow passages in the passageway system alternatively the travel of a valve such as valve 33 can be limited so that the end of a valve cooperates with a passageway opening.