【作者】 吴建光； 叶建平； 唐书恒；

【Author】 WU Jian-guang, YIE Jian-ping, TANG Shu-heng(China University of Mining & Technology, Beijing 100083; China United Coalbed Methane Corporation, Beijing 100011, China; China University of Geology)

【机构】 中国矿业大学； 中联煤层气有限责任公司； 中国地质大学；

【摘要】 根据煤储层的吸附/解吸机理,模拟煤层气井“排采-注气-排采”的生产过程,进行CH4、CO2的单相气体吸附/解吸和CO2注入置换煤层CH4的实验,得到了CH4和CO2二元气体相组分变化数据和CH4和CO2混合气体的相分离图解。结果表明,在CH4和CO2二元气体的竞争吸附中,CO2组分的吸附速率是先快后慢,而CH4组分的吸附速率先慢后快,解吸时则相反。反映了CO2组分在与CH4组分的竞争吸附中占据优势,优先被吸附;同时发现注入气体数量越大,注入气体中CO2组分浓度越高,单位压降下的CH4解吸率和CO2吸附率越高。实验结论对工业规模的煤层气开发试验具有一定的指导意义。更多还原

【Abstract】 According to adsorption-desorption mechanisms of coal reservoir, the experiment simulated the production process of drainage-injection drainage, then experimented on adsorption-desorption of CH4 and CO2 and replacement of CH4 by CO2 injection. Then the data of CO2 and CH4 composition variation and phase-separation figure were observed. The experiment showed that the competition rate of CO2 was decreasing with time, and the rate of CH4 was increasing with time during adsorption. However, the contrary result was observed during desorption. It indicated that the carbon dioxide adsorption was prior to methane’s. If the amount of injected carbon dioxide was more and carbon dioxide’s concentration was higher, the rates of methane desorption and carbon dioxide adsorption is higher. The conclusion of the experiment is significant to commercial production of coalbed methane.更多还原