Since the current commonly used bubble detection method cannot meet the requirements of real-time bubble detection in terms of the detection target and volume, this paper proposes a method of real-time detection of coal-bed methane (CBM) bubble parameters in a borehole with a double-sensor conductivity probe and designs the corresponding test device. The ellipsoid correction algorithm was adopted for the calculation of the bubble volume to reduce the error. Simulation test results indicated that the proposed device can quickly and reliably measure local bubble parameters, including void fraction, bubble velocity, and bubble volume. This technique can be applied to monitor the fluid parameters of different strata of main coal in CBM well simultaneously and provide a basis for the comparison of reservoir properties of different main coal seams and the effect of CBM well exploitation.

中文翻译：

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双传感器电导率探头测量煤层气气泡参数

针对目前常用的气泡检测方法在检测目标和体积方面不能满足实时气泡检测的要求，提出一种钻孔煤层气（CBM）气泡参数实时检测方法。配双传感器电导率探头并设计相应的测试装置。气泡体积的计算采用椭球校正算法，以减少误差。仿真测试结果表明，所提出的装置可以快速可靠地测量局部气泡参数，包括空隙率、气泡速度和气泡体积。