Pump jack pump-off control method and pump jack control...

F - Mech Eng,Light,Heat,Weapons – 04 – B

Patent

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F04B 49/06 (2006.01) F04B 49/10 (2006.01)

Patent

CA 2667599

It is possible to provide a pump jack pump-off control method and a pump jack control device which can continuously perform production of an oil well without stopping the device due to an excessive load error or congealment of raw oil even when a pump-off is caused to lower speed and can prevent lowering of the yield. Upon detection of a pump-off condition, an excessive load alarm signal of the AC motor switches the pump jack to an intermittent operation during operation with a lowered pump jack speed or during operation at the lowest speed. Moreover, the stroke speed during upstroke of the pump jack is made to be a rectangular waveform from a sinusoidal waveform or an upstroke operation is performed while applying a torque limit in an inverter operation.

L'invention concerne un procédé de commande de désamorçage de pompe destiné à un chevalet de pompage et un dispositif de commande de chevalet de pompage associé permettant d'obtenir une production continue sur un puits de pétrole, sans arrêter le dispositif en raison d'une erreur de charge excessive ou de la congélation du pétrole brut, même lorsqu'un désamorçage de pompe provoque une réduction de la vitesse; et d'éviter une baisse de rendement. Lors de la détection d'un état de désamorçage de pompe, un signal d'alarme de charge excessive du moteur CA commute le chevalet de pompage sur un fonctionnement intermittent, lorsque le chevalet de pompage fonctionne à vitesse réduite, ou lorsque la vitesse de fonctionnement est à son minimum. En outre, la vitesse de la course, pendant la course montante du chevalet de pompage est transformée en une forme d'onde rectangulaire, à partir d'une forme d'onde sinusoïdale, ou une opération de course montante s'effectue pendant qu'une limite de couple est appliquée lors d'une opération d'inversion.

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