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为了解高压注水后水对含瓦斯煤中瓦斯解吸的影响,利用自主设计的外液侵入条件下瓦斯解吸试验装置,在环境温度为20℃条件下,分别开展了无水侵入和有水侵入后水对含瓦斯煤中瓦斯解吸影响的对比试验,其瓦斯吸附平衡压力分别为2.5MPa,2.0MPa,1.5MPa,1.0MPa,而环境压力则分别为2.0MPa,1.5MPa,1.0MPa,0.5MPa,瓦斯吸附平衡压力与所处的环境压力之差均为0.5MPa,共进行了四组对比试验,并对试验数据进行了对比分析。结果表明:水的后置侵入不仅会使瓦斯解吸量大大减少,而且还会使瓦斯解吸的终止时间提前。因此,在评价高压注水对提高瓦斯抽采效果时,不仅要考虑高压水对煤层的增透作用以及对瓦斯的驱动作用,还应综合考虑水对瓦斯解吸的损害影响。
In order to understand the influence of high pressure water injection on methane desorption in gas containing coal gas, the gas desorption test device under the designed external liquid intrusion condition was used to conduct gas desorption test under the environment temperature of 20 ℃. Compared with gas desorption in gas coal, the equilibrium pressure of gas adsorption is 2.5MPa, 2.0MPa, 1.5MPa and 1.0MPa respectively, while the ambient pressure is respectively 2.0MPa, 1.5MPa, 1.0MPa and 0.5MPa, The difference between the gas adsorption equilibrium pressure and the ambient pressure is 0.5MPa. A total of four sets of comparison tests were conducted and the experimental data were compared and analyzed. The results show that water intrusion can not only greatly reduce gas desorption but also lead to the termination of gas desorption. Therefore, when evaluating the effect of high-pressure water injection on gas drainage, it is necessary to consider not only the effect of high-pressure water on the seepage enhancement of coal seam and the driving effect on gas, but also the damage of water on gas desorption.