Hydraulic oil well pumping apparatus
US9617837B2 · kind B2 · utility
0Cited by
29References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 14, 2014 |
| Grant date | Apr 11, 2017 |
| Priority date | — |
| Expiry date | Apr 1, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/126
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hydraulic oil well pumping arrangement employs a compensating type hydraulic pump, a directional valving arrangement and a proportioning valving arrangement. When the directional valve is energized, oil is directed to the rod end of the hydraulic cylinder. In one embodiment, a time delay halts the movement of the sucker rod or pumping string to allow accumulation of oil in a slow following well. In another embodiment, the pumping string rapidly falls to the bottom of the stroke in order to shake or jar debris from the string.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.