Pump-off control responsive to time changes between rod string l

Details Pump-off control responsive to time changes between rod string l Pump-off control responsive to time changes between rod string l

1975-05-27

1976-12-21

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Having timer or delay means

417 45, 417 53, F04B 4900

Patent

active

039985687

ABSTRACT:
A pump-off control unit for use in conjunction with a motor driven pumpjack assembly which is connected to reciprocate a downhole production pump. A current transformer connected to the pumpjack motor compares the time interval of a no-load portion of the pumping cycle to a second time interval, and shuts in the well when the ratio between the two intervals changes an amount which indicates a pump-off condition of the downhole pump assembly.

REFERENCES:
patent: 3073244 (1963-01-01), Elliot et al.
patent: 3075466 (1963-01-01), Agnew et al.
patent: 3138750 (1964-06-01), Borger et al.
patent: 3363573 (1968-01-01), Jaeger
patent: 3413535 (1968-11-01), Hubby
patent: 3440512 (1969-04-01), Hubby
patent: 3509824 (1970-05-01), Schmidly, Jr.
patent: 3778694 (1973-12-01), Hubby
patent: 3851995 (1974-12-01), Mills
patent: 3918843 (1975-11-01), Douglas
patent: R27393 (1972-06-01), Aselman

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