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\Delta p ' = \frac{d \, \Delta p}{d \, \ln t} = \frac{q_t}{4 \pi \sigma} = \rm const |
Since IARF is normally used to define a flow regime during a certain finite period of time, the term "infinite acting" is a misnomer.
This flow regime is native to pressure diffusion in vertical well, homogeneous reservoir and no boundary (see Fig. 1).
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| Fig. 1. PTA Diagnostic Plot with IARF regime developed after 100 hrs |
The other popular occurrence of IARF is before PSS (Fig.2) and SS (Fig. 3).
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| Fig. 2. PTA Diagnostic Plot with IARF regime developed between 100 hrs and 1,000 hrs |
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| Fig. 3. PTA Diagnostic Plot with IARF regime developed between 100 hrs and 1,000 hrs |