TAM’s PosiFrac® Multi-set Straddle System is the most flexible and reliable inflatable packer system for selectively testing multiple zones. It can be used in both open-hole and cased wells for long-term or short-term testing programs. The assembly can be inflated to isolate specific intervals and injection tests can be carried out. The well can then be shut-in downhole for the fall-off period, minimizing wellbore storage effects and providing an improved method of well testing. The tool assembly can be unset, moved and inflated to isolate additional intervals for testing.