基于电容法的原油局部持水率检测方案

Measurement Scheme of Local Water Holdup in Oil-water Two-phase Flow Based on Capacitance Method

针对阵列式电容法原油持水率检测提出平面交指式电容传感器结构,设计实现基于电容频率转换的一体化检测方案,开发了基于电源电流变化的信号检测电路。实验结果表明,该方案传感器体积小,电路连接线少,被测电容值经变频后抗干扰能力强,在低持水率段(≤50%)有良好的分辨率,对阵列式电容法原油持水率检测仪器研究具有参考价值。

In order to realize array measurement of water holdup on oil well section,a capacitancebased sensor with planar inter-digital structure is proposed,an integrated detecting module is designed,which converts the measured capacitance value to periodic signal with corresponding frequency,a circuit which extracts signal from current change of power supply is developed.The experimental result shows the above solution has advantages to minimize size sensor,less connections between sensors and circuit boards,strong anti-interference performance and high definition when waterholdup is not above 50%,thereby,it has important reference value for developing array capacitance-based log tool for water holdup measurement.