Method and apparatus for controlling a submergible pumping syste

Details Method and apparatus for controlling a submergible pumping syste Method and apparatus for controlling a submergible pumping syste

1997-12-01

2000-04-04

Freay, Charles G.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

417 53, 417 42, 417 43, F04B 4906

Patent

active

060453338

ABSTRACT:
A submergible pumping unit for raising viscous fluids from a well is driven by an electronic drive and control system, a first portion of which is located above the well, and a second portion of which is coupled to the submergible pumping unit. The drive and control system includes a power supply circuit located above the well for converting AC power from a source to DC power having current and voltage levels. The DC power is transmitted to the pumping unit via a two-conductor DC bus cable. The pumping unit includes a switching circuit which receives the DC power for driving a submergible motor, such as a permanent magnet brushless motor. The speed of the motor, and of a pump coupled thereto, is proportional to the voltage of the DC power applied to the pumping unit. The pump is preferably a progressive cavity pump, and the drive and control circuitry provides sufficient torque to start the pump from a static condition. A control circuit is provided for transmitting configuration and desired flow rate and speed data to the power supply.

REFERENCES:
patent: 4687054 (1987-08-01), Russell et al.
patent: 5049046 (1991-09-01), Escue et al.
patent: 5179306 (1993-01-01), Nasar
patent: 5193985 (1993-03-01), Escue et al.
patent: 5708337 (1998-01-01), Breit et al.

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