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The One if the two Well Controls with Lift Mechanism is maintaining  maintaining the manually specified bottom-hole pressure (for producers) or THP (for injectors Injectors). 


The pressure control is a usual condition for water injectors and gas injectors and specified by the THP maintained by the ground booster pump.

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This does not actually qualifies this production as Pressure Control and the well is still under Liquid Control conditions and once bottomhole pressure raises above minimal the pump returns to producing the target liquid rate 

LaTeX Math Inline
bodyq^{\uparrow}_L(t) = q^{\uparrow}_{LL} = \rm const

See Also

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Petroleum Industry / Upstream /  Production / Subsurface Production Operations / Well Control

[ Pressure Control (Dynamic Modelling) ]

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