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美国Amoco公司开发的注入增产法是一项很有前途的提高煤层气采收率的方法 ,为此笔者在研究煤对二元混合气体吸附特征的基础上 ,探讨了注入增产法的基本原理。结果表明 ,煤对常见气体的吸附能力由强到弱为 :二氧化碳、甲烷、氮气、氢气 ;煤对二元混合气体总的吸附及对甲烷的吸附均符合Langmiur方程 ,但在CH4 +H2 或CH4 +N2 的吸附系统中 ,对H2 或N2 吸附时吸附量与压力之间不遵从此关系式 ,而在CH4 +CO2 吸附系统中 ,煤对CO2 的吸附量和压力之间的关系仍可用Langmuir方程定量描述 ;注入增产法提高煤层瓦斯抽放率是通过注入其它气体使煤对甲烷的吸附量减小来实现的 ,且注入N2 优于CO2 。
The injection stimulation method developed by the Amoco Company in the United States is a promising method to improve CBM recovery rate. Therefore, on the basis of studying the adsorption characteristics of binary mixed gas with coal, the author explores the basic principle of injection stimulation method. The results show that the adsorption capacity of coal to common gas from strong to weak is: carbon dioxide, methane, nitrogen and hydrogen; the total adsorption of coal on binary mixed gas and the adsorption of methane are in line with Langmiur equation, but in CH4 + H2 or CH4 + N2 adsorption system, the relationship between adsorption capacity and pressure is not obeyed for H2 or N2 adsorption. However, in the CH4 + CO2 adsorption system, the relation between CO2 adsorption capacity and pressure can still be described by Langmuir equation Quantitative description; Injection stimulation method to increase gas drainage rate is through the injection of other gases to reduce coal adsorption of methane to achieve, and the injection of N2 is superior to CO2.