Doubles For Initial Test… Mini-frac’ or Diagnostic Fracture Injection Tests (#DFIT) help double your #welltest efficiency if pressure gauges are downhole. Program pressure recorders for rapid data sampling (1 sec). Do a Leak-off Test (LOT) to confirm wellbore integrity. Acid spearhead if necessary. Start mini-frac’ at 0.5–1.0 m3/minute, establish breakdown, hold injection rate constant, maximum 5–10 m3 of Newtonian fluid (N2, oil, water). Hard shut-down, close all wellhead valves. Wait ≈60 min before rigging out pump. Changing injection rate, either step-up or step-down, is not recommended as the critical closure pressure signature can be masked by the rate change. A final reverse static gradient survey should be conducted, when recovering subsurface pressure recorders, to terminate the mini-frac’ and fall-off tests.