Active intake pressure control of downhole pump assemblies

摘要

Progressive cavity pump assemblies including one or more mechanisms adapted to regulate intake pressure of the main pump between a minimum intake pressure and a maximum intake pressure. In one embodiment, the mechanism is a flap assembly configured to open at a threshold pressure to discharge wellbore fluid and close after falling below the threshold pressure. -6 14, 606 612 +-610- -610-+ Fig. 6B 604-60 606 & 620 4-610- -610-+ Fig. 6C