Thermal Data Helpful for Identifying Valid Radial Flow Conditions. Temperature data recorded during a #welltest can be reflective of wellbore storage or afterflow effects and can help identify valid radial flow conditions. This #gas (#LNG) well #PTA example is the pressure derivative response for the thermal storage example presented last week. Note what appears to be very early radial flow followed by a transmissivity (kh/µ) change only one hour after shut-in. Thermal diagnostics suggests that the pressure derivative behaviour during the initial 4 h of shut-in was likely affected by thermal storage effects (warming combined with gas compression). Hence, only pressure data beyond 4 h would be considered indicative of true reservoir flow characteristics, and validity of the coincidental ‘radial flow’ would be questionable.