Unconventional Testing Alternatives

Mini-Frac’ or DFIT (Diagnostic Fracture Injection Test) is another #welltest alternative that might be worth considering to satisfy #AER Initial oil and gas (#LNG) well test requirements. In horizontal wellbores mini-frac’s can be successful if conducted through the toe port. Another strategy is to complete the multi-stage frac’, clean up the well some, install gauges below the pump and rods, and monitor the pressure for a few weeks, before pump start-up. Schedule a pump workover within 90 days to pull gauges. Analyze the build-up or...

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Mini-Frac’ DFIT Testing

Doubles For Initial Test… Mini-frac’ or Diagnostic Fracture Injection Tests (#DFIT) help double your #welltest efficiency if pressure gauges are downhole. G-Function analysis estimates closure stress, pore pressure, and leak-off type. After-Closure analysis may provide an estimate of flow capacity (kh) for use in fracture stimulation design. What isn’t specifically clear in #AER D40 is that pressure transient analysis (#PTA) is acceptable for estimating Initial Pressure Oil or Gas (#LNG) conditions (p*). Conceptionally, DFIT is...

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Mini-Frac’ DFIT Testing

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...

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Mini-Frac’ DFIT Testing

Doubles For Initial Test… Mini-frac’ or Diagnostic Fracture Injection Tests (#DFIT) help double your testing efficiency if pressure gauges are downhole. First, a successful test helps estimate hydraulic fracture closure pressure and reservoir flow properties—valuable information for stimulation programs. Second, the pressure fall-off #welltest can be analyzed (#PTA) to comply with #AER Initial Pressure requirements for Oil or Gas (#LNG) wells (p*). A minimum shut-in of 8 h is required for the transient gauge PAS file data (TRG.pas)...

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Diagnostic Fracture Injection Testing (DFIT)

Characterizing Reservoir Properties using Diagnostic Fracture Injection Testing (DFIT) was presented at a recent Society of Petroleum Engineers (SPE) luncheon. A great talk – and a great reservoir diagnostic test – as our example Level 2 eREPORT illustrates: DFIT2 Mini-frac’ Fall-off. But…here in Alberta…as per ERCB Bulletin 2010-38 surface (or acoustic well sounder) data are no longer acceptable for Initial Pressure Gas or Initial Pressure Oil requirements. For compliance with Initial Pressure requirements the...

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