原3104XA微电极测井仪的弊端和改进措施

Disadvantages and Improvements of 3104XA Minilog Tool.

分析了CLS 370 0系列测井仪 310 4XA微电极测井仪在现场应用中存在的一些主要问题 ,提出了针对微电极线路的改进措施。用高温晶体震荡器、分频器和反向器形成新的工作所需的工作频率逻辑方波 ,以提高工作频率精度和温度的稳定性 ;经过增益调整、功率放大及新的变压器升压可使原微电极供电电极电流达到 2 4mA ;通过调整测量电流的前置放大增益和带通滤波增益 ,将微梯度和微电位的高刻信号幅度调整为 5 0 0mV ,使其测量动态范围达 10 0Ω·m ;采用变压器耦合、前置放大电路、带通滤波电路、相敏检波电路和低通滤波完成对测量信号的检测。改进后的线路经试验和实际现场实验 ,达到了工作频率、幅度和温度系数的稳定性 。

The basic principle of CLS-3700 3104XA minilog tool is briefly introduced. The problems about 3104XA minilog tool in in-site application are analyzed. High temperature oscillator, divider and inverter produce logic square wave for working frequency so that precise frequency and stable temperature are achieved. By adjusting gain, power amplification and new transformer′s voltage increase cause 3104XA minilog electrode-current go up to 24 mA; By adjusting pre-amplifier gain and band pass filter gain of detective current, amplitudes of micro-lateral and micro-normal highscaled signal are adjusted to 500 mV, dynamic range goes up to 100 Ω·m. Through pre-amplifier, band pass filter, phase sensitive detector and low-pass filter, signals are detected. Experiments and test-effect prove that the new electric-circuit has higher stability and stronger anti-disturbing ability.