Temperature analysis of electric heating hollow sucker rods and its application

On the basis of the theories of skin effect and the coupling of electromagnetic and temperature field, a finite element method (FEM) model of an alternating current heating hollow sucker rod was established by using the finite element method. The temperature of inner wall and outer wall of the hollow sucker rod was simulated, and the factors affecting the temperature distribution were analyzed. There exits a functional relationship among the temperature distribution, the current frequency, and the heating time. The higher the frequency, the higher the temperature. The longer the heating time, the higher the temperature. By changing the alternating current frequency and the heating time, the temperature of hollow sucker rod could be controlled to suit the exploitation of different kinds of heavy oil. An example was given to show that the application of the hollow sucker rod's temperature analysis could estimate the preheating time during heavy oil recovery, which provides a reasonable reference for selecting the current frequency and the heating time.