Abstract: Four methods are described for inducing high differential pressures across perforations in wells traversing earth formations. Nitrogen, N2, or another inert gas is introduced into the well under pressure (via the annulus and/or the tubing), thereby lowering the fluid column and setting up conditions for lowering the hydrostatic pressure above the formation. The formation is then subjected to sudden exposure to the lowered hydrostatic pressure, either through use of a pressure-actuated surge valve or through sudden bleed-off of the N2 gas. In both cases, a sudden release of well fluid pressure into the tubing string and/or annulus produces an implosion force and surges the perforations.