Method and appartus for detecting well pump-off

Details Method and appartus for detecting well pump-off Method and appartus for detecting well pump-off

F - Mech Eng,Light,Heat,Weapons

04

B

341/108, 166/26

F04B 49/06 (2006.01) E21B 47/00 (2006.01) F04B 47/00 (2006.01)

Patent

CA 1217838

-49- Abstract of the Disclosure Methods and apparatus for detecting fluid pound in a sucker-rod oil well, using maximum and minimum values of sucker-rod position and of sucker-rod load to calculate a reference position and a selected load value. The apparatus automatically calculates the reference position and the selected load value according to the characteristics of the well and of the well pump- ing equipment. When the sucker-rod moves downward to the reference position, the actual load value is checked against the selected value and in one embodiment of the invention a warning signal develops when the amount of the load exceeds the previously selected load quantity. In another embodiment a warning signal develops when the rate of change of the load is at a maximum below the reference position. In a third embodiment a warning signal develops when a minimum rate of change of the load occurs below the reference position.

443475

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