Deconvolution in Well Testing: Pressure transient behavior analysis usually begins with the examination of the test data on different derivative, superposition, or Cartesian Plots. From these plots, a united and more recognizable picture can be built which will enable us to understand the main features of the test transient pressure behavior. This traditional and conventional well testing approach is still being used. However, a new well testing tool called Deconvolution was starting to receive much attention, and has been emerging as a new tool of analyzing test data in the form of constant rate drawdown response using specific pressure rate algorithms.