Method for pump-off detection
US4034808A · kind A · utility
22Cited by
10References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 20, 1976 |
| Grant date | Jul 12, 1977 |
| Priority date | — |
| Expiry date | Sep 20, 1996 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B49/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for measuring the energy input to the rod string of a well pumping unit in real time wherein the load on the rod string is multiplied by the velocity of the rod string and the result integrated over at least a portion of the pump stroke. The change in the energy input to the well is used to determine when the well has pumped-off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.