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该文讨论了采用注气方法提高煤层甲烷采收率的机理,认为注入的气体在增加储层能量的同时,还可以与煤层甲烷产生竞争吸附或置换驱替效应,从而提高煤层甲烷的采收率。通过煤对纯甲烷气体和甲烷-氮气、甲烷-二氧化碳二元气体的等温吸附和解吸实验,分别获得了它们的Langmuir方程,并对它们的理论最大采收率进行了对比分析。结果表明,在含气量相同的情况下,煤层中二元气体的理论最大采收率比纯煤层甲烷的理论最大采收率要高得多。
In this paper, the mechanism of gas injection to improve methane recovery rate is discussed. It is considered that the injected gas can increase the reservoir energy and at the same time, it can compete with coal seam methane for adsorption or displacement displacement to improve methane recovery rate. Through the isothermal adsorption and desorption experiments of pure methane gas, methane-nitrogen and methane-carbon dioxide binary gases, respectively, their Langmuir equations were obtained and their theoretical maximum recovery rates were compared. The results show that the theoretical maximum recovery of binary gases in coal seams is much higher than that of pure coal methane under the same gas content.