More than Just PTA… Checking differentials provides added value. The operator was ready to walk away from this well due to uneconomically low gas rates. However, note the huge tubing/casing differential, not to mention the casing pressure trend shift from declining to suddenly building up! A check of operation reports revealed that wireline encountered an obstruction and could not install recorders, hence the need to use surface pressure data acquisition equipment (gauges). Casing pressure data indicated a sandface AOF ten-times greater than the tubinghead TOF. In reality this well had a crimp in the coiled tubing string. After repair, the well flowed an economic 20 e3m3/d compared to the test gas rate of only 2.5 e3m3/d.