Thermal Data Trends are Useful for Welltest Diagnostics (#PTA). Research demonstrates that skin in a gas (#LNG) well is a function of temperature. Significant JT cooling would be a function of a dramatic pressure drop across the perforations, thus indicating near wellbore damage. Negligible JT cooling would be associated with more optimal conditions. This observation has been used to qualify the nature of the near wellbore condition when #welltest pressure data have proven inconclusive for various reasons.