旋转导向系统中非接触电能与信号一体化传输技术

旋转导向系统可有效提高钻井速度、安全性和井眼轨迹控制精度,是油气行业尤其是复杂环境下油气勘探开发的核心设备之一.非接触电能和信号传输单元是旋转导向系统中将电能和信号从旋转主轴传输至非旋转外套的重要单元.为了保证高温下大负载时电压输出的稳定性以及信号同步传输的可靠性,本文提出一种载波调制式电能与信号一体化的传输方法,在信号并联注入并联拾取的同步传输拓扑结构基础上,增加隔离电感与谐振电容,对新的拓扑结构进行数学建模,对电压增益、电流增益以及效率进行仿真,并通过仿真结果选择最优电路参数.实验验证该电路拓扑和传输方法在175 ℃环境温度下带载可到150 W,在150 W动态带载下输出电压的变化幅值小于输入电压的8%、传输速率115200 bps(bit per second,比特率)且误码率低于百万分之一.

Integrated transmission technology of non-contact power and signal in rotary steering system

The rotary steering system can effectively speed up drilling, ensure higher security and improve the accuracy of the well trajectory control. It is one of the core equipment in the oil and gas industry, especially for the exploration in complex environments. The non-contact electric energy and signal transmission unit is an important part for the rotary guidance system to transmit electric energy and signals from the rotating spindle to the non-rotating outer sleeve. In order to guarantee the stability of voltage output and the reliability of signal synchronous transmission under high temperature environment with heavy load, a transmission method is proposed where electric energy and signals can be integrated via carrier modulation. Based on the synchronous transmission topology with parallel injected and parallel pickup signals, isolation inductance and resonant capacitor are added to mathematically model the new topology and simulate the voltage gain, the current gain and the efficiency. According to the results, the optimal circuit parameters are selected. The experiments verify that the load can reach 150 W at the temperature of 175 ℃ by adopting this circuit topology and transmission method. Within the range of 150 W dynamic load, the change of the output voltage is less than 8% of the input voltage with a 115200 bps transmission rate, whose bit error rate is less than one millionth.