Variable speed pump control for maintaining fluid level below fu

Details Variable speed pump control for maintaining fluid level below fu Variable speed pump control for maintaining fluid level below fu

1989-02-10

1991-09-03

Smith, Leonard E.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

417 45, 417 53, F04B 4900

Patent

active

050448889

ABSTRACT:
A variable speed pump control system and method which senses operational parameters during the first one half of the down stroke to control pump speed to maximize production. The method and equipment maintains ths fluid level of a well as low as possible while avoiding the pump-off condition. A variable speed motor drives a pump jack and a control means varies the pump speed. Means are provided for simultaneously sensing the pump speed, load on the rod, and the position of the rod in the pump stroke. These measurements are utilized to calculate the power transferred between the rod string and the beam during a portion of the downstroke. Before the pump is continuously operated, a series of measurements are made in the full barrel pumping condition to determine the power transferred between the rod and beam at various speeds. These are utilized to establish a relationship between pump speed and power during a portion of the downstroke. The well is operated and the measured values obtained during pumping are compared to the established relationship between pump speed and power. The pump speed is varied according the established relationship to power to optimize the fluid level in the well.

REFERENCES:
patent: 3951209 (1976-04-01), Gibbs
patent: 4015469 (1977-04-01), Womack et al.
patent: 4034808 (1977-07-01), Patterson
patent: 4058757 (1977-11-01), Welton et al.
patent: 4145161 (1979-03-01), Skinner

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