It appears only logical that surface pressure data could prove useful for interference #welltesting in high permeability gas zones. Valid results have been derived from both producing wells and injection wells. This example illustrates the surface pressure data trace from a gas (#LNG) storage observation well. Subsurface pressures exhibited identical behaviour. Substantial cost savings were realized with future #welltest operations by not requiring expensive electric wireline services for surface readout of bottomhole pressure gauges.