METHOD FOR DYNAMIC WELL OPERATION WITH THE USE OF ELECTRIC PUMP WITH VARIABLE-FREQUENCY DRIVE Russian patent published in 2008 - IPC E21B43/00 F04B47/00 

FIELD: oil production, particularly to operate wells provided with electric pumps, particularly submersed electric pumps with valve actuators.

SUBSTANCE: method involves periodically repeating cycles; activating electric pump as supply voltage frequency increases and supplying liquid with electric pump at a given rotary speed. Liquid is pumped out with the use of electric pump with frequency-regulated drive and ac electronic motor. Regime characterized by constant current corresponding to initial dynamic liquid level in well is fixed. During electric pump operation ac electronic motor current behavior in time is continuously controlled. At each current elevation to value exceeding admissible value corresponding to current rotary speed ac electronic motor current rotary speed is increased for predetermined value defined from threshold ac electronic motor current sensitivity until said current variation is stopped or decreases to value less than admissible one corresponding to current rotation speed. At that if ac electronic motor current does not vary electric pump is shifted into stabilization mode at new dynamic level close to initial one. As ac electronic motor current decreases to value less than admissible one ac electronic motor rotation speed is reduced for predetermined value specified by ac electronic motor current sensitivity threshold. Then electric pump is shifted into cyclic mode when average dynamic level is close to initial one.

EFFECT: increased operational efficiency for well with varying productivity due to minimized dynamic level change.

2 dwg