【摘要】 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。更多还原

【Abstract】 For obtaining the effects of water on gas desorption in coal with gas after high pressure water injection,comparative experiments with no water invasion and water invasion were respectively conducted in a self-made gas desorption experimental device under the environmental temperature 20℃.Under the conditions of gas adsorption balance pressure being 2.5 MPa,2.0 MPa,1.5 MPa,1.0 MPa,separately,and corresponding environmental pressure being 2.0 MPa,1.5 MPa,1.0 MPa,0.5 MPa,separately,four pairs of comparative experiments were conducted totally and the experimental data were analyzed.The results indicate that the late invasion of water can not only greatly reduce the quantity of gas desorption,but also advance the ending time of gas desorption.Therefore,when evaluating the effect of high pressure water injection on gas extraction,the effect of water on coal bed’s permeability and on gas’ driving function should not only be taken into account,but also the bad effect of water on gas desorption as well.更多还原