Hydraulic well pumping apparatus
US4646517A · kind A · utility
Inventor
Key dates
| Filing date | Apr 11, 1983 |
| Grant date | Mar 3, 1987 |
| Priority date | — |
| Expiry date | Apr 11, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B47/04
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
For use with a pumped well having a string of sucker rods connecting to a downhole pump, hydraulic pumping apparatus is disclosed. In the preferred and illustrated embodiment, a polished rod is surrounded by a selectively located sleeve. The sleeve locks to a piston in a hydraulic cylinder. The piston is forced upwardly. The length of stroke is adjusted. The location of the sleeve on the polished rod is likewise adjustable. This enables the device to be adjusted so that any length of sucker rods can be accommodated without requiring cutting sucker rods to achieve a particular length. Moreover, the length of stroke is adjustable to take into account the stroke of the pump and sucker rod elongation during operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.