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