电加热空心抽油杆温度分析与应用

基于集肤效应原理及电磁场和温度场的有关耦合理论,利用有限元方法,建立了空心抽油杆交流电加热系统温度分析模型,对空心抽油杆内壁和外壁的温度变化进行了数值模拟并对抽油杆杆体温度变化影响因素进行了分析.结果表明,空心抽油杆杆体的温度分布与电流频率和通电时间具有一定的函数关系.频率越高,杆体温度越高;通电时间越长,杆体的温度越高.可以通过改变交流电的频率和通电时间,控制空心抽油杆杆体的温度,来适应不同性质稠油的开采.实际应用算例表明,将空心抽油杆温度分析用于估计稠油预热时间,可为稠油开采中电加热系统的加热频率和通电时间的合理选择提供参考.图8表1参11

Temperature analysis of electric heating hollow sucker rods and its application

Based on the theories of skin effect and the coupling of electromagnetic and temperature fields, a temperature model of alternating current heating hollow sucker rod was established by the finite element method. The temperature of inner wall and outer wall of 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 hollow sucker rod temperature can be controlled to suit for the exploition of different kinds of heavy oil. An example was given to show that the hollow sucker rod temperature analysis can be used to estimate the preheating time during the heavy oil recovery, providing reasonable reference for selecting the current frequency and the heating time.