Pressure activated pump-off control
US4744729A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1986 |
| Grant date | May 17, 1988 |
| Priority date | — |
| Expiry date | Sep 11, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D9/12
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A pressure-activated pump-off control for intermitting the operation of a low-production well. A pressure sensor and a series of three timers control the operation of the pump to maximize efficiency. A first fill-in timer disables the pump for a first time period during which fluids accumulate in the well. When the fill-in timer times out, both a second pump-up timer and the pump motor are energized. If the pressure sensor determines adequate minimum fluid pressure in the tubing, the pressure switch is opened, the second timer is de-energized, and control of the pump being transferred to a third pump-up timer in conjunction with the pressure sensor. When the pressure falls below the desired minimum, the pressure switch will remain closed and after a predetermined period of time corresponding to a desired number of strokes, the pump-off timer times out, shuts off the pump and re-energizes the fill-in timer for another cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.