Variable Frequency Drives (VFDs) are an advanced type of beam pump-off controller with the ability to increase or decrease pumping speed. This facilitates drawing down the fluid level to near pump off conditions and maintaining a constant bottom hole pressure, all while running 24 hours per day. VFDs have been successfully utilized over the last few years to reduce the failure frequency in the most problematic wells, and in some cases, increase production as well.

Keywords:
production monitoring, pprl ratio, optimization, beam pumping, reservoir surveillance, average stroke, pump efficiency, artificial lift system, upstream oil & gas, mark ii
Subjects:
Artificial Lift Systems, Well & Reservoir Surveillance and Monitoring, Beam and related pumping techniques
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