Oil well pumping unit
US4512149A · kind A · utility
Inventor
Key dates
| Filing date | Feb 11, 1982 |
| Grant date | Apr 23, 1985 |
| Priority date | — |
| Expiry date | Feb 11, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B47/145
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
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 assembly 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 th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.