二元气体等温吸附实验及其对煤层甲烷开发的意义  

Binary-Component Gas Adsorption Isotherm Experiments and Their Significance to Exploitation of Coalbed Methane

作　　者：唐书恒[1] 汤达祯[1] 杨起[1] 

机构地区：[1]中国地质大学能源地质系,北京100083

出　　处：《地球科学（中国地质大学学报）》2004年第2期219-223,共5页Earth Science-Journal of China University of Geosciences

基　　金：国家重点基础研究发展规划项目 (2 0 0 2CB2 1170 2 ) ;国家自然科学基金项目 (No .40 2 72 0 69) ;高等学校博士学科点专项科研基金项目(No .2 0 0 2 0 4910 0 3 )

摘　　要：分别进行了CH4-CO2 和CH4-N2 二元混合气体的等温吸附实验 ,并且分析了二元气体在吸附过程中各组分浓度的变化规律 .结果表明 ,在CH4-N2 二元气体的吸附过程中 ,吸附相中CH4组分的相对浓度逐渐增加 ,N2 组分的相对浓度逐渐减少 .在CO2 -CH4二元气体的吸附过程中 ,吸附相中CO2 组分的相对浓度逐渐增加 ,CH4组分的相对浓度逐渐减少 .实验结果证实了CO2 在与CH4的竞争吸附中占据优势 ,而N2 在与CH4的竞争吸附中处于劣势 .注入CO2 比注入N2 可以更有效地置换或驱替煤层甲烷 ,提高煤层甲烷的采收率 .The adsorption isotherm experiments of CH_4-CO_2 and CH_4-N_2 binary-component gas were carried out respectively, and the variation regularity of each component concentration in the experiments were analyzed. The experiment results indicate that the relative concentration of CH_4 component in absorbed phase increases gradually while the relative concentration of N_2 component in absorbed phase decreases gradually in the adsorption isotherm experiment of CH_4-N_2 binary-component gas. Whereas the relative concentration of CO_2 component in absorbed phase shows a gradual increase and the relative concentration of CH_4 component shows a gradual decrease in the adsorption isotherm experiment of CO_2-CH_4 binary-component gas. These results confirm that CO_2 occupies the predominant position and N_2 locates at inferior position as they compete for adsorption with CH_4 respectively. Therefore, CO_2-injection can replace or displace coalbed methane and enhance methane recovery more effectively than N_2-injection.

关 键 词：二元气体 等温吸附实验 竞争吸附 煤层甲烷 提高采收率 

分 类 号：P618.11[天文地球—矿床学]