Patent ID: 8087457

Claim:
A method of short-term well operation to produce a liquid from a well by a submersible impeller pump unit with an electrical drive and a productive capacity of greater than 80 cubic meters per day, said method comprising: alternating pumping a liquid out of a well when said unit is turned on and accumulating a liquid in the well when the unit is turned off; adjusting an average integral-in-time capacity of said unit by changing a proportion between a time interval of pumping the liquid out of the well and a time interval of accumulating the liquid in the well in order to bring said productive capacity in conformity with a well production rate; adjusting a pressure produced by said unit during the time interval of pumping the liquid out of the well by changing a rotation velocity of said unit such that an efficiency of said unit is at least 0.9 of a maximum value of said efficiency for a given rotation velocity of said unit throughout an adjustment range; selecting a time interval of a complete operational cycle of said unit equal to a sum of said time interval of pumping the liquid out of the well and said time interval of accumulating the liquid in the well so as to have a production rate reduction factor greater than 0.95 as compared to a production rate reduction factor of continuous well operation; and selecting a factor of cyclic time interval of unit turning-on equal to a ratio of said time interval of pumping the liquid out of the well to said time interval of the complete operational cycle of said unit so that said factor is less than 50%.