Pump-off controller

Details Pump-off controller Pump-off controller

1983-08-01

1986-04-22

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

With condition responsive control of pump fluid valve

417 44, 417 53, 417 63, 73151, F04B 4906, F04B 4702

Patent

active

045839158

ABSTRACT:
The pump-off controller checks for pump-off by calculating the area inside of a figure whose boundaries are the minimum load, two position lines defined by the user and the load at the time the calculation is being made. This area is compared to a user defined limit to determine whether pump-off has occurred. While the well is running the controller also checks the value of the minimum load, and if it is outside of preset boundaries it readjusts the load signal to locate it within the desired range. The position synthesizer cyclically detects the position of the beam or rod during each stroke and generates a waveform whose amplitude and frequency correspond to the motion of the rod with a period corresponding to the time of each stroke. This information is used by the controller to determine the top of the stroke and to check for pump-off.

REFERENCES:
patent: 3343409 (1967-09-01), Gibbs
patent: 3930752 (1976-01-01), Douglas
patent: 3951209 (1976-04-01), Gibbs
patent: 4015469 (1977-04-01), Womack
patent: 4034808 (1977-07-01), Patterson
patent: 4062640 (1977-12-01), Gault
patent: 4286925 (1981-09-01), Standish
patent: 4302157 (1981-11-01), Welton
patent: 4363605 (1982-12-01), Mills
patent: 4487061 (1984-12-01), McTamaney
patent: 4541274 (1985-09-01), Porcupile

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