Perforation Inflow Diagnostic (PID) Tests—Conventional Analysis. Using conventional #welltest analysis software, then, data before the critical flow cut-off can be analyzed as a pressure drawdown. Data following the cut-off point can be analyzed as a pressure buildup. Conventional pressure derivative and radial flow (semi-log) analytical techniques can be employed. Analytical models can also be employed with either regime. Corresponding analysis of conventional flow and buildup test data (as per illustration) has demonstrated validity of the pid analysis technique for generating quantitative results with order-of-magnitude accuracy (kh, s, q, p*) in both oil and gas (#LNG) wells.