Lifting process at which liquid production rate stays constant over time along with pump settings :
q^{\uparrow}_L(t) = q^{\uparrow}_{LL} = \rm const |
The usual lifting mechanism supporting this method is ESP and SRP.
In practice the constant rate production can only be maintained for wells with BHP being above critical value
at which pump is operational:
p_{wf}(t) > p_{wf,c} |
otherwise the pump stabilizes production at critical pressure :
p_{wf}(t) = p_{wf,c} |
and the actual liquid production rate starts declining linearly with formation pressure:
q_L(t) = J \cdot ( p_e(t) - p_{wf,c} ) |
In case formation pressure in producer receives a support and gets high enough to make estimation equal to original pump setting
then liquid production rate gets back to
.
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing (WT) / Flowrate Testing / Flowrate
[ Well & Reservoir Surveillance ]
[ Surface flowrates ] [ Oil surface flowrate ] [ Gas surface flowrate ] [ Water surface flowrate ]
[ Constant pressure production: pwf = const ]