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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Research on the Conductivity-Based Detection Principles of Bubbles in Two-Phase Flows and the Design of a Bubble Sensor for CBM Wells
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Research on the Conductivity-Based Detection Principles of Bubbles in Two-Phase Flows and the Design of a Bubble Sensor for CBM Wells

机译：基于电导率的两相流气泡检测原理研究及煤层气井气泡传感器的设计

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The parameters of gas-liquid two-phase flow bubbles in field coalbed methane (CBM) wells are of great significance for analyzing coalbed methane output, judging faults in CBM wells, and developing gas drainage and extraction processes, which stimulates an urgent need for detecting bubble parameters for CBM wells in the field. However, existing bubble detectors cannot meet the requirements of the working environments of CBM wells. Therefore, this paper reports findings on the principles of measuring the flow pattern, velocity, and volume of two-phase flow bubbles based on conductivity, from which a new bubble sensor was designed. The structural parameters and other parameters of the sensor were then computed, the “water film phenomenon” produced by the sensor was analyzed, and the appropriate materials for making the sensor were tested and selected. After the sensor was successfully devised, laboratory tests and field tests were performed, and the test results indicated that the sensor was highly reliable and could detect the flow patterns of two-phase flows, as well as the quantities, velocities, and volumes of bubbles. With a velocity measurement error of ±5% and a volume measurement error of ±7%, the sensor can meet the requirements of field use. Finally, the characteristics and deficiencies of the bubble sensor are summarized based on an analysis of the measurement errors and a comparison of existing bubble-measuring devices and the designed sensor.
机译：煤层气井的气液两相流气泡参数对于分析煤层气产量，判断煤层气井的故障以及发展瓦斯抽采工艺具有重要意义，这迫切需要进行检测。现场煤层气井的气泡参数。但是，现有的气泡检测器不能满足煤层气井工作环境的要求。因此，本文报告了有关基于电导率测量两相流气泡的流型，速度和体积的原理的发现，并由此设计了一种新型气泡传感器。然后计算传感器的结构参数和其他参数，分析传感器产生的“水膜现象”，并测试和选择用于制造传感器的合适材料。成功设计传感器后，进行了实验室测试和现场测试，测试结果表明该传感器具有很高的可靠性，可以检测两相流的流型以及气泡的数量，速度和体积。 。速度测量误差为±5％，体积测量误差为±7％，该传感器可以满足现场使用的要求。最后，在对测量误差进行分析的基础上，对现有的气泡测量装置与所设计的传感器进行比较，总结了气泡传感器的特点和不足。

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