More than Just PTA… Temperature validation and differentials help with qualitative assessment and adds value. This example displays liquid influx and wellbore hydrodynamics throughout both flow and buildup periods. Thermal diagnostics have saved economic wells by illustrating unexpected liquid problems (once after the driller dumped waste water on the formation to secretly dispose of it). Sometimes liquid problems don’t manifest at surface or on subsurface pressure patterns…but they always show dynamically on the temperature trace! Temperatures can also identify hidden cleanup effects, especially on frac’d wells.