基于电容法的原油高含水测试仿真研究
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摘要
针对原油高含水率难于测量的问题,设计了一种新型多层筒式结构电容传感器。通过对被测介质的介电特性进行研究,分析了多层筒式电容传感器的各结构参数对系统灵敏度的影响和测量原理,推导出高含水率与电容的计算模型,并用Comsol Multiphysics软件对模型进行静电场仿真。从二维角度,对电容传感器的几何参数进行研究。分析了泡径对传感器响应以及油泡接触方式的影响,证明了多层筒式电容传感器对高含水率有较好的响应特性。当油泡内径小于0. 5 mm时,传感器响应特性较低。当油泡同时与两极板接触时,相比其他三种接触方式有较为明显的变化。该研究验证了多层筒式电容传感器在90%～100%高含水率测量中的有效性和可行性。
Aiming at the difficulty of measuring high moisture of crude oil,a new multi-layer barrel capacitance sensor is proposed. By studying the dielectric properties of the measured medium,the influence of the structure parameters of multi-layer barrel capacitance sensor on the sensitivity of the system,and the measuring principle are analyzed. The calculation model of high moisture and capacitance is derived; and the model is simulated by Comsol multiphysics software. The geometric parameters of capacitance sensor are studied from two-dimensional perspective. The influence of bubble diameter on sensor response and contact mode of oil bubbles is analyzed. It is proved that multi-layer barrel capacitance sensor has better response characteristics for high moisture. When the inner diameter of the oil bubbles is less than 0. 5 mm,the response characteristics of the sensor are low. When the oil bubbles contact with the two plates at the same time,there are obvious changes compared with the other three contact modes. The research validates the validity and feasibility of multi-layer barrel capacitance sensor in the measurement of 90% ～100% high moisture.
Aiming at the difficulty of measuring high moisture of crude oil,a new multi-layer barrel capacitance sensor is proposed. By studying the dielectric properties of the measured medium,the influence of the structure parameters of multi-layer barrel capacitance sensor on the sensitivity of the system,and the measuring principle are analyzed. The calculation model of high moisture and capacitance is derived; and the model is simulated by Comsol multiphysics software. The geometric parameters of capacitance sensor are studied from two-dimensional perspective. The influence of bubble diameter on sensor response and contact mode of oil bubbles is analyzed. It is proved that multi-layer barrel capacitance sensor has better response characteristics for high moisture. When the inner diameter of the oil bubbles is less than 0. 5 mm,the response characteristics of the sensor are low. When the oil bubbles contact with the two plates at the same time,there are obvious changes compared with the other three contact modes. The research validates the validity and feasibility of multi-layer barrel capacitance sensor in the measurement of 90% ～100% high moisture.
引文
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[10]焦敬品,李亮,何存富,等.厚度渐变结构介电性能测试用变间距叉指型相邻电容传感器设计[J].机械工程学报,2017,53(18):1-9.
[2]尤波,陈召,贾德利,等.基于相位法在线实时油井含水率仪研究[J].仪表技术与传感器,2017(6):48-53.
[3]徐文峰,李文涛,刘兴斌,等.一种测量低产液水平井含水率的筒状电容传感器[J].测井技术,2008(5):403-405.
[4]杜怀栋,王春光.电容和电阻法原油含水率快速测量仪的研制[J].自动化仪表,2015,36(4):63-67.
[5]于宝,于靖民,孔垂广,等.低速同轴阵列电容法测量含水率的新理论模型[J].测井技术,2017,41(1):8-13.
[6] ZUBAIR M,TANG T B. A high resolution capacitive sensing systemfor the measurement of water content in crude oil[J]. Sensors,2014,14(7):11351-11361.
[7]何卓.基于BST的铁电—铁磁复合陶瓷的介电性能研究[D].武汉:华中科技大学,2015.
[8] SONG Y,ZHAN H L,ZHAO K,et al. Simultaneous characterizationof water content and distribution in high-water-cut crude oil[J].Energy&Fuels,2016,30(5):340.
[9]杜怀栋,王春光.电容和电阻法原油含水率快速测量仪的研制[J].自动化仪表,2015,36(4):63-67.
[10]焦敬品,李亮,何存富,等.厚度渐变结构介电性能测试用变间距叉指型相邻电容传感器设计[J].机械工程学报,2017,53(18):1-9.