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Pressure difference between the current bottom-hole pressure
p_{wf}(t) and the bottom-hole pressure
p_{wf}(t_0) at time moment
t=t_0 when flowrate has changed :
|
\delta p (t) = p_{wf}(t_0) - p_{wf}(t) |
In particular case when the well has been shut-in for a long time and bottom-hole pressure has stabilised by the time moment
t_0 and when well is opened for flow the pressure drop will be equal to pressure drawdown:
|
{\rm pressure } \, \, {\rm drop} = \delta p (t) = p_{wf}(t_0) - p_{wf}(t) = p_e - p_{wf}(t) = \Delta p(t) = {\rm pressure } \, \, {\rm drawdown} |
as the initial bottom-hole pressure value
p_{wf}(t_0) represents formation pressure
p_e: