Method and apparatus for controlling a walking beam pump
US5204595A · kind A · utility
37Cited by
16References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1991 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | Mar 5, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/127
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Method for controlling an electric drive motor coupled to a reciprocating mechanical system such as an oil well walking beam pump by inserting a pair of power-off pulses in a reciprocation period of the pump motor energization cycle, with one pulse in a top-of-cycle region and the other pulse in a bottom-of-cycle region to reduce rod stress and motor electrical power consumption and increase pump displacement and efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.