基于CPLD的油气井陀螺测斜仪控制电路的设计

Design of control circuit of gyroscope inclinometer in oil and gas well based on CPLD

针对油气钻井中恶劣环境条件(+150℃以上高温和100 MPa以上高压)下陀螺测斜仪出现温度漂移的现实问题,设计开发了一种对温度漂移具有补偿功能的陀螺测斜仪控制电路,以便高精度获取陀螺测斜仪的敏感信号,确保仪器在油气勘探中提供准确的钻头走向方位信息。基于CPLD的温度补偿控制电路,主要由校正网络信号预处理电路、A/D采样芯片及CPLD芯片组成。性能测试结果表明,设计的对温度漂移能够进行补偿的控制电路,具有温漂补偿能力强、测量精度高、工作稳定性好等特点,可用于油气钻井中高温高压恶劣环境条件下钻头走向方位信息的测量工作,具有一定的工程应用参考价值。

To the realistic problem of temperature drift on the adverse environmental conditions （＋150 ℃ high tempera ture above, over 100 MPa high-voltage） in oil gas prospecting, a gyroscope inclinometer control circuit with temperature drift compensation has been designed. It can acquire high-precision gyroscope inclinometer signal sensitively and ensure drill bit azimuth information. It mainly consists of correction network signal preconditioning circuit, an A/D converter and CPLD chip. The test result shows that the temperature drift compensation circuit has well compensation, high preci sion and good stability etc. It can work under high temperature and high pressure and has certain engineering values.