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Sucker Rod Pumps (pump jacks): how to correctly measure Power Consumption of its electric motor

Sucker Rod Pumps (pump jacks): how to correctly measure Power Consumption of its electric motor

Sucker Rod Pumps (pump jacks): how to correctly measure Power Consumption of its electric motor

(OP)
We need to measure the Electric Power consumption (power intake) of electric motors driving Pump Jacks in oil wells.
I am pretty sure this requires the use of a special type of meter due to the cyclic nature of the pump operation (along its cycle it goes from high to low % Load values). Something like the Dranetz Demand Analyzer (e.g. take readings over a certain time interval).
Common hand-held, single digital output devices (e.g volts, amps, kw etc) won't do for this particular application.
I have seen this issue documented in a few papers (e.g. from the Society of Petroleum Engineers -SPE-).
I would appreciate if someone can indicate specific references regarding applicable standards for this measurement (like API, IEEE, etc).
Comments and suggestions on this issue will also be greatly appreciated.

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