Method for pump-off detection

Details Method for pump-off detection Method for pump-off detection

1976-09-20

1977-07-12

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

166 53, 166 65R, 73151, E21B 4700, F04B 4902, G01L 500

Patent

active

040348083

ABSTRACT:
A method and apparatus for measuring the energy input to the rod string of a well pumping unit in real time wherein the load on the rod string is multiplied by the velocity of the rod string and the result integrated over at least a portion of the pump stroke. The change in the energy input to the well is used to determine when the well has pumped-off.

REFERENCES:
patent: 2596361 (1952-05-01), Blancher
patent: 2845125 (1958-07-01), Truman
patent: 3343409 (1967-09-01), Gibbs
patent: 3457781 (1969-07-01), Elliott
patent: 3527094 (1970-09-01), Yew et al.
patent: 3559731 (1971-02-01), Stafford
patent: 3817094 (1974-06-01), Montgomery et al.
patent: 3824851 (1974-07-01), Hagar et al.
patent: 3838597 (1974-10-01), Montgomery et al.
patent: 3951209 (1976-04-01), Gibbs

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