Chemistry and Technology of Fuels and Oils, Vol.56, No.6, 1020-1027, 2021
Measurement of CBM Bubble Parameters by Double-Sensor Conductivity Probe
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.