Sistema de sensoriamento eletromagnético utilizado para detecção da contaminação do óleo isolante do motor no método de elevação artificial do tipo bombeio centrífugo submerso

摘要

In the artificial lift method by Electrical Submersible Pump (ESP), the energy istransmitted for the well´s deep through a flat electric handle, where it is converted intomechanical energy through an engine of sub-surface, which is connected to a centrifugalpump. This transmits energy to the fluid under the pressure form, bringing it to the surfaceIn this method the subsurface equipment is basically divided into: pump, seal andmotor. The main function of the seal is the protect the motor, avoiding the motor´s oil becontaminated by oil production and the consequent burning of it. Over time, the seal will bewearing and initiates a contamination of motor oil, causing it to lose its insulatingcharacteristics.This work presents a design of a magnetic sensor capable of detecting contaminationof insulating oil used in the artificial lift method of oil-type Electrical Submersible Pump(ESP). The objective of this sensor is to generate alarm signal just the moment when thecontamination in the isolated oil is present, enabling the implementation of a predictivemaintenance. The prototype was designed to work in harsh conditions to reach a depth of2000m and temperatures up to 150°C. It was used a simulator software to defined themechanical and electromagnetic variables. Results of field experiments were performed tovalidate the prototype. The final results performed in an ESP system with a 62HP motorshowed a good reliability and fast response of the prototype.