Variable Frequency Drive

The variable frequency drive (VFD) is an extremely powerful tool in ESP operations. The essential principle of varying the motor rotational speed above and below that dictated by line frequency to improve performance has developed into a myriad of complex functions and features. These can sometimes be a little confusing, and Weatherford has sought to simplify the process for our customers by working closely with them to explain the benefits to their particular application, and ensuring specified equipment is the optimum.Weatherford’s VFD technology draws on a lineage rich in experience of superior automation. This knowledge has more recently been focused on meeting the unique needs of an ESP drive system, and the result is a best in class flexible system which is tailor made for ESP applications while maintaining the focus on providing near unity power factor. Our advanced pump control strategies reduce the energy cost-per-barrel of fluid produced, providing significant power and OPEX savings.

As well as the usual drive features of soft starter, electrical parameter monitoring, harmonic reduction etc, the Weatherford VFD also features a ground breaking data extrapolation system which uses known well, fluid and motor data to monitor critical downhole parameters, ideal for situations where a downhole sensor may not be practical. Rather than focus on the traditional ESP troubleshooting unit of amps the Weatherford system additionally uses nodal intelligence to monitor system performance at all critical zones, be it fluid level, intake pressure or motor torque. This system ensure that when downhole conditions or pump performance change the operator will know in real time, and warnings, alarms and shutdowns can be used to offer the best protection available to the ESP for the life of the well.

Our standard low and mid range VFD’s are available up to 600 KVA. Larger drives up to 1200 KVA can be provided for higher horsepower application.