Lifting process at which liquid production rate stays constant over time along with pump settings $//<![CDATA[ \begin{array}{l}q^{\uparrow}_{LL}\end{array} //]]>$:

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 $//<![CDATA[ \begin{array}{l}p_{wf}\end{array} //]]>$   being above critical value  $//<![CDATA[ \begin{array}{l}p_{wf,c}\end{array} //]]>$  at which pump is operational:

otherwise the pump  stabilizes production at critical pressure  $//<![CDATA[ \begin{array}{l}p_{wf,c}\end{array} //]]>$:

and the actual liquid production rate starts declining linearly with formation pressure:

In case formation pressure in producer receives a support and gets high enough to make   (4) estimation equal to original pump setting  $//<![CDATA[ \begin{array}{l}q^{\uparrow}_{LL}\end{array} //]]>$ then liquid production rate gets back to (1).

See Also

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 ]