Method of monitoring and controlling a well pump apparatus

Details Method of monitoring and controlling a well pump apparatus Method of monitoring and controlling a well pump apparatus

1992-10-19

1994-02-08

Bertsch, Richard A.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

417 44J, 417 53, F04B 4906

Patent

active

052844226

ABSTRACT:
A method of monitoring and controlling a well pump apparatus having an electric motor that rotates a crank arm having a counterweight thereon, a pivoted walking beam oscillated by the crank arm which reciprocates a sucker rod and a pump between an upstroke and a downstroke. The electric current from the motor is measured periodically between the peak upstroke motor current and the peak downstroke motor current, and the results are then integrated to deduce an analysis current per stroke. The mean of a number of sequential samples of the analysis current per period is calculated and thereafter the standard deviation is calculated. The last sample will be within two standard deviations of the mean or the results will be discarded and new data gathered. The well pump apparatus is stopped if a selected number of consecutive samples fall below a preselected threshold.

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