Method and apparatus for variable speed control of oil well...

F - Mech Eng,Light,Heat,Weapons – 16 – H

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F16H 9/00 (2006.01) E21B 43/12 (2006.01) F04B 47/02 (2006.01)

Patent

CA 2093466

A method and apparatus for varying the speed of operations of an oil well pumping unit powered by a motor wherein variations in oil viscosity may be efficiently accommodated. An oil well pumping unit which includes a submersible pump actuated by means of a reciprocating string of sucker rods is monitored for both rod position and load present on the sucker rods. The oil well pumping unit is driven by an electric or gas motor through a controllable coupling and the speed of the oil well pumping unit is then varied, utilizing the controllable coupling, in response to variations in sucker rod load. As the lowering of the sucker rod is impeded by high viscosity oil, the load on the sucker rod decreases. This decrease in sucker rod load is utilized to decrease the speed of the oil well pumping unit by means of the controllable coupling to ensure that bridle separation does not occur. Additionally, increases in sucker rod load above a preselected maximum may also be detected and utilized to slow the operation of the oil well pumping unit to prevent damage to the sucker rods.

Cette invention concerne une méthode et un appareil efficaces de variation de la vitesse de fonctionnement d'une installation de pompage sur puits de pétrole en fonction des variations de la viscosité du liquide à pomper. L'installation de pompage comprend une pompe submersible commandée par une colonne de tiges de pompage à mouvement alternatif dont la position et l'état de charge sont contrôlés en continu. L'installation de pompage est animée par un moteur électrique ou à essence par l'intermédiaire d'un variateur de vitesse asservi aux variations de la charge mesurée à la tige de pompage. Lorsque la descente de la tige pompage est ralentie par la grande viscosité du pétrole, la charge y mesurée décroît. Cette variation à la baisse est utilisée pour réduire la vitesse d'entraînement de la pompe pour éviter la rupture de l'accouplement balancier-tige de pompage. Par ailleurs, l'objet de l'invention permet de détecter une augmentation de cette charge au-delà d'un maximum pré-établi et de ralentir l'installation de pompage pour éviter l'endommagement des tiges de pompage.

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