... to select the appropriate VSD frequency feedback object function for each of these cases. For weak inflow, the VSD is configured to maintain constant intake pressure, especially where the intake pressure is less than 500 psia. For ESPs suffering from gas interference, constant current was implemented...

... annular two-phase flow artificial lift system psia gas well tubinghead pressure plunger lift casinghead pressure plunger cycle liquid loading production data lift performance plunger cumulative production well 1 relative permeability production rate society of petroleum engineers...

... & Gas accuracy gas compressibility factor nitrogen temperature range temperature correction factor psig high pressure bellow pressure design pressure equation of state psia calculation test rack pressure Winkler Introduction Nitrogen gas has been successfully used by the petroleum...