Zhou Qing, Huang He, Wu Chuan, Wen Guojun, Liu Bin
Faculty of Mechanical and Electronic Information, China University of Geosciences (Wuhan), Wuhan 430074, China.
Powerchina Hubei Electric Engineering Co., Ltd., Wuhan 430040, China.
Rev Sci Instrum. 2021 May 1;92(5):055006. doi: 10.1063/5.0045787.
The rotation speed and direction of the drill pipe are the key parameters to control the drilling process, which need to be measured in real-time. Here, a self-powered drill pipe sensor that can measure the rotation speed and direction based on the triboelectric nanogenerators is proposed in this research. The basic working principle is that the single-electrode triboelectric nanogenerator will output the sawtooth signal during the rotation of the drill pipe, so the rotation speed can be measured by counting the signal pulse frequency, and then, the rotation direction can be realized by judging the direction of the tooth tip of the sawtooth signals. Test results show that the measurement range is 0-1000 rpm, the measurement error is less than 4%, the sensitivity is 0.0167 Hz/rpm, and the linearity is 3.5%. Further tests show that the maximum output voltage, current, and power are 21 V, 900 nA, and 3.35 μW, respectively, when a 107 Ω load resistance is connected in series. In addition, the working condition reliability tests show that the working temperature is less than 150 °C and the working relative humidity is less than 90%, with high reliability, which is very suitable for the drilling environments.
钻杆的转速和转向是控制钻井过程的关键参数，需要进行实时测量。在此，本研究提出了一种基于摩擦纳米发电机的可测量钻杆转速和转向的自供电钻杆传感器。其基本工作原理是，单电极摩擦纳米发电机在钻杆旋转过程中会输出锯齿信号，因此可通过对信号脉冲频率进行计数来测量转速，然后，通过判断锯齿信号齿尖的方向来确定转向。测试结果表明，测量范围为0 - 1000转/分钟，测量误差小于4%，灵敏度为0.0167赫兹/转/分钟，线性度为3.5%。进一步测试表明，当串联一个107Ω的负载电阻时，最大输出电压、电流和功率分别为21V、900nA和3.35μW。此外，工况可靠性测试表明，工作温度低于150°C，工作相对湿度低于90%，可靠性高，非常适合钻井环境。
