Variable Speed Pumping Unit Hydraulic Drive Control

The patent applies a variable speed drive system that allows the pump speed to be dynamically adjusted based on fluid levels. When water volume is high, the pump operates at higher speeds for maximum productivity. When fluid levels drop, the speed automatically reduces to maintain adequate lubrication and prevent overheating, thus resolving the contradiction between high productivity and temperature control.

The patent implements periodic operation with automatic start-stop control based on fluid level sensing. The pump operates periodically rather than continuously, maintaining reliability by preventing sticking through controlled intermittent operation. The variable speed drive enables smooth transitions between on and off states, reducing mechanical stress while maintaining the ability to operate at low water levels.

The patent employs a feedback control system with fluid level sensing that automatically adjusts pump speed in response to changing conditions. When water production increases, the system detects the rise and increases speed to maintain productivity. When production decreases, the feedback mechanism reduces speed gradually, preventing sudden pressure surges from the formation while maintaining the capacity to handle high production when needed.

The patent utilizes a hydraulic motor coupled with a variable speed drive system. This hydraulic approach provides smooth, continuous speed adjustment capability while maintaining relatively simple mechanical structures. The hydraulic system allows for easy speed modulation to adapt to varying water levels and pressures without significantly increasing overall device complexity, bridging the gap between simple fixed-speed designs and complex variable-speed systems.