主动法瓦斯压力测定技术在示范矿区煤层气与煤炭协调开发中的应用

Application of active gas pressure measurement technology in the coordinated development of coalbed methane and coal in demonstration mines

煤层原始瓦斯压力的测定对矿井瓦斯治理具有重要意义,传统的被动测压法所需时间长。为了快速测定出五阳煤矿7801工作面煤层瓦斯压力,提出采用主动法瓦斯压力测定技术,阐明了主动式瓦斯压力测定技术的原理,并对补偿气体的选择进行了分析,表明补偿气体可以采用N2。现场施工2个测压钻孔进行瓦斯压力测定,注入补偿气体压力为预计瓦斯压力的0.5倍,2钻孔测定结果分别为0.25 MPa和0.28 MPa,同时选取测定点煤样,实验室测试煤层瓦斯含量和吸附常数等参数,依据朗格缪尔方程反算出煤层瓦斯压力,对现场测定结果进行验证,反算结果为0.27 MPa,与现场测定结果相差不大,表明该方法可以在五阳煤矿应用,以提高瓦斯压力的测定速度。

The determination of the original gas pressure of the coal seam is of great significance to the mine gas management,and the traditional passive pressure measurement method has the characteristic of taking a long time.In order to quickly determine the coal seam gas pressure of Wuyang Mine 7801 face,the active gas pressure measurement technology was proposed,the principle of active gas pressure measurement technology was clarified,and the choice of compensation gas was analyzed,which showed that the compensation gas can be N2.2 pressure boreholes constructed at the site for gas pressure measurement,and the pressure of the injected compensation gas was 0.5 times of the expected gas pressure,2 boreholes,the results were 0.25 MPa and 0.28 MPa respectively;meanwhile,the coal samples were selected to test the coal seam gas content and adsorption constant and other parameters in the laboratory,and the coal seam gas pressure was calculated backwards based on Langmuir's equation to verify the on-site measurement results to determine the velocity of gas pressure.