| 摘要 |
<p>A pumping unit for wells which is hydraulically powered and adapted to replace or used in lieu of conventional pump jacks. The hydraulic system utilized with the hydraulically operated pumping unit includes an accumulator system which stores energy produced by gravity induced downward movement of the pump rod and other pump components during the down stroke and automatically utilizes this stored energy to assist in lifting the pump components and the column of production fluid thereby increasing the efficiency of the pumping unit. The pumping unit utilizes a pair of hydraulically operated piston and cylinder assemblies having a lower end stationarily connected to a supporting structure and an upper end connected to a vertically guided slide assembly having a pair of grooved pulleys journaled thereon with flexible link chains entrained thereover with one end of the chains being anchored to the supporting structure and the other ends depending from the slide and connected to the polish rod whereby the linear movement of the pistons in the piston and cylinder assemblies will be one-half of the linear movement of the polish rod, thereby providing a compact structure so that the vertical movement of the slide can be more effectively guided and controlled. The entire pumping unit is mounted on a supporting skid or framework with all of the valves and high pressure connections being disposed interiorly of a reservoir except for the motor-pump unit and the cylinders and conduits connecting the upper and lower ends of the cylinders to the hydraulic system.</p> |
