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\delta p (t) = p_{wf}(t_0) - p_{wf}(t) |
Pressure drop is is:
positive |
| when production rate is increased or injection rate is decreased | ||||
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negative |
| when production rate is decreased or injection rate is increased |
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On log-log plots the pressure drop is always pictured as positive (see Fig. 1).
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Fig. 1. A sample Example of typical pressure drop P (in blue ) derived from them BHP data records (Fig. 2) and presented at log-log plot | Fig. 2. A source BHP data records which lead to a pressure drop on Fig. 1 |
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as the initial bottom-hole pressure value
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See Also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Pressure Testing / Pressure Transient Analysis (PTA) / PTA Diagnostic Plot
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