| 摘要 |
A method and apparatus for shutting down a pumpjack. A first step involves securing a liquid trap above packing of a wellhead stuffing box through which a sucker rod for the pumpjack passes, such that as liquid leaks past the packing it becomes trapped in the liquid trap. A second step involves providing a switch that is activated by an accumulation of liquid within the liquid trap. A third step involves a circuit that connects to the switch and is adapted for connection to a drive system for the pumpjack. Activation of the switch by an accumulation of liquid within the liquid trap shuts down the pumpjack.
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