HYDRAULIC OIL WELL PUMPING APPARATUS

摘要

A hydraulic oil well pumping apparatus utilizing a hydraulic cylinder having a piston or rod that is movable between upper and lower piston positions. A pumping string or sucker rod extends downwardly from the piston, the pumping string or sucker rod being configured to extend into an oil well for pumping oil from the well. A prime mover such as an engine is connected to a compensating type hydraulic pump, a directional control valve moves between open flow and closed flow positions and a hydraulic flow line connects the pump and the hydraulic cylinder. Electronic controls are provided that control movement of the piston as it moves between the upper and lower positions.