目的 设计一种智能化油井套管脉冲电流阴极保护电源控制系统,实现电源的智能化运行,确保保护效果最佳。 方法 采用三层闭环控制策略实现电源的自适应调节,采用先进的处理算法对输出电流、输出电压、套管电位进行处理,判断脉冲电流阴极保护的效果,输出相应的 PWM 控制信号,并对电源的输出参数进行实时调节。 结果 在 5. 0 m×0. 5 m×0. 5 m 的 PVC 绝缘水槽中模拟油井套管脉冲电流阴极保护系统,该系统能控制输出频率、幅值、占空比均可独立调节的脉冲电流,使 40 角钢的保护电位达到-0. 85 V。 结论 该控制系统可以实现油井套管脉冲电流阴极保护电源的智能化运行,具有投入成本低、可靠性高、功能完善、操作方便等优点。

Objective To design a kind of intelligent control system of pulse current cathodic protection for oil well casing, realize the intelligent operation of power supply, and make sure that the cathodic protection of oil well casing pulse current is in the best condition. Methods Three-level closed-loop control strategy was adopted to realize the adaptive regulation of power supply. The advanced processing algorithm was used to deal with the output current, output voltage and casing potential, to determine the protective effect of pulse current cathodic protection, and output the corresponding PWM control signal to achieve real-time control of the power supply. Results A pulse current cathodic protection system of the oil well casing was simulated in the PVC insulated sink of 5. 0 m×0. 5 m×0. 5 m. This control system could control the pulse current with independently adjustable output frequency, amplitude and duty cycle, and the protection potential of the steel reached -0. 85 V. Conclusion This control system could realize the intelligent operation of power supply of pulse current cathodic protection for oil well casing, with advantages of low cost, high reliability, perfect function, and convenient operation.