主动式补气对煤层瓦斯压力测定影响规律研究

Study on the Influence Laws of Active Air Supply on Coal Seam Gas Pressure Measurement

针对目前煤层瓦斯压力测定周期长、准确性差的问题,采用理论分析、数值模拟和现场实验相结合的研究方法,分析了主动式补气快速测压的原理,研究了补气气源压力、补气时间、煤层渗透率、原始瓦斯压力等因素对补气测压结果的影响规律。结果表明,主动式补气可以明显减少瓦斯压力测定所需要的时间,补气压力越接于煤层原始瓦斯压力、煤层透气性越大、补气时间越长,越有利于煤层瓦斯压力的测定。现场试验证实,主动式补气法对准确快速测定煤层瓦斯压力具有较好的实用价值。

In order to solve the problems of low accuracy and long duration of current coal seam gas pressure measuring method,through theoretical analysis,numerical simulation and field test,the principle of coal seam gas pressure measurement with active air supply is analyzed,and the influence laws of the factors such as air supply pressure,air supply duration,seam permeability and original seam gas pressure on measuring result of gas pressure are also studied.The results show that the measuring duration can be significantly shortened through active air supply.The colser to the original seam gas pressure the injecting air pressure is,the higher the seam permeability is,the longer the injecting duration is,the better the application effect is.The field tests also show that the method of gas pressure measurement with active air supply provides practical values for rapid and accurate measurement of coal seam gas pressure.