Michael Romer
ExxonMobil
ESP permanent magnet motors (PMMs) have been confirmed to conserve power when compared to conventional induction motors (IMs) in various industry papers and studies. However, most production comparisons comprise a snapshot in time or the partial life of a single ESP. This analysis is useful, but it doesn’t convey the full power-saving value of a PMM installation.
This paper aims to investigate the energy saving potential of a PMM in comparison to an IM for two asset types: “unconventional” shale oil and conventional waterflood. ESP power data for a selection of IM-driven shale and waterflood wells will be analyzed over several years of installation(s). Power savings from theoretical PMM installations for the same wells will then be calculated based on actual IM system loading. This information will lead to the potential initial value of applying a PMM in each asset type. Theoretical and actual lifting efficiencies will also be compared, and the reasons for discrepancies linked to asset types will be discussed.
The authors expect this paper will assist engineers in high-grading PMM applications, particularly in regard to energy savings. It’s also expected that the lifting inefficiencies identified over the life of a shale oil well ESP will indicate further areas for equipment research & development.