钻孔瓦斯流量测定对衰减系数的影响分析

Influence Analysis of Borehole Gas Flow Measurement on Attenuation Coefficient

基于钻孔瓦斯径向流理论,流量随时间变化的负指数衰减规律,通过公式推导及实例分析,最终确定在初始时间t0确定的前提下,不同时间段的选取及不同流量计量方式的选择对衰减系数的计算不发生影响,但不同的计算方式下所解得的钻孔瓦斯初始流量q0不尽相同。有利于工程实际过程中衰减系数的测量及分析运用。

Based on the gas radial flow theory,flow rate changes with time of negative exponential attenuation law.Through formula derivation and examples of analysis,the paper finally determined that in the conditions of determinating initial time of t0,selection of different time and the different flow metering mode had no impact on the calculation of the attenuation coefficient,but borehole gas initial flow q0 soloved by different calculations is not the same,which is conducive to the measurement and analysis application of the attenuation coefficient in the actual process.