Pressure activated pump-off control

Details Pressure activated pump-off control Pressure activated pump-off control

1986-09-11

1988-05-17

Smith, Leonard E.

Pumps

Condition responsive control of pump drive motor

Having timer or delay means

417 18, 417 44, F04B 4902

Patent

active

047447290

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.

REFERENCES:
patent: 3559731 (1971-02-01), Stafford
patent: 3972648 (1976-08-01), Sangster
patent: 4507053 (1985-03-01), Frizzell
patent: 4508488 (1985-04-01), Pikna
patent: 4516911 (1985-05-01), Senghaas et al.

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