Improved energy management
Cumulative energy consumption and the effectiveness of input energy in delivering useful lift work are continuously monitored and considered. Power limiters allow the maximum and regenerative power supplied by the drive to be conserved. The UniStar system instructs power flow control to smooth power flow, reduce gearbox stress, increase pumping efficiency, and maximize production for highly variable inflows.
Pump fill optimization
Managing pump fill is important to protect downhole equipment. The UniStar system accurately determines and regulates the percentage of pump fill. Rather than stop a pump completely during a pumpoff condition, the system adjusts upstroke and downstroke speeds to maintain a target fill value and maximize production. This allows the pump to automatically adapt to changing well inflows, eliminating fluid pound, reducing peak rod load, preventing standstill sand infiltration, eliminating stresses associated with start/stop cycling, and improving pumping efficiency.