Pumps – Condition responsive control of pump drive motor – Having timer or delay means
Patent
1988-01-19
1989-08-22
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
Having timer or delay means
417 43, 417 63, 417 53, F04B 4902, F04B 4908
Patent
active
048591513
ABSTRACT:
A pump-off control for a pumpjack unit. The pumpjack unit has a flow line therefrom connected to a tank battery. A control device is connected in the flow line so that all of the production must flow therethrough. The control apparatus includes an orifice placed in the flow line and a bypass arranged for flow to occur around the orifice. A movable member is placed within the bypass and each stroke of the pumpjack moves the member in proportion to the quantity of liquid flowing therethrough. The movable member is connected to actuate a switch device, indicator, chart, and counter. The orifice is sized respective to the movable member so that each stroke of the pumpjace causes the movable member to move in proportion to the produced fluid forced through the bypass. The switch device is positioned to be actuated at a predetermined flow rate each stroke of the pump. The switch device actuates circuitry which causes the pumpjack unit to be shut-in whenever the cyclic flow is less than a predetermined amount, thereby avoiding fluid pounding and enabling the downhole pump to be operated at maximum efficiency.
REFERENCES:
patent: 2853575 (1958-09-01), Reynolds
patent: 3559731 (1971-02-01), Stafford
patent: 4118148 (1978-10-01), Allen
patent: 4119865 (1978-10-01), Elderton
patent: 4507053 (1985-03-01), Frizzell
patent: 4744729 (1988-05-01), Hasten
patent: 4749925 (1988-06-01), Wilkins
Bates Marcus L.
Freeh William L.
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