注入CO2提高煤层气产能的可行性研究

注入CO2提高煤层气产能的可行性研究

吴建光1 2, 叶建平2, 唐书恒3

1. 中国矿业大学（北京）北京100083; 2. 中联煤层气有限责任公司北京 100011; 3. 中国地质大学北京北京 100083

收稿日期:2004-09-20 修回日期:2004-09-20 出版日期:2004-09-20 发布日期:2004-09-20

A Feasibility Study on CO2 Injection for Enhancing the Coalbed Methane Recovery

Wu Jian-guang1 2, YE Jian-ping2, TANG Shu-hen3

1. China University of Mining, Beijing 100083, China; 2. Zhonglian Coalbed Mathane Company Lim., Beijing 100011, China; 3. China University of Geosciences, Beijing100083, China

Received:2004-09-20 Revised:2004-09-20 Online:2004-09-20 Published:2004-09-20

摘要/Abstract

摘要： 根据煤储层吸附一解吸机理，首次采用“解吸一注气一解吸”的实验方法，分别进行CH4，CO2的吸附一解吸和CO2注入置换煤层CH4实验，模拟了煤层气井“排采一注气一排采”的增产途径和效果。结果表明：在CH4和CO2二元体系的竞争吸附中，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，反映出CO2在竞争吸附中占据优势；注入CO2气体的数量越大和相对浓度越高，单位压降CH4解吸率和CO2吸附率就越高。实验结论对工业规模的煤层气开发试验具有指导意义。

Abstract: The adsorption-desorption behavior of carbon dioxide and methane gases in coal samples were experimentally studied.The replacement experiments of methane by carbon dioxide for simulating the proeess of "CH4 production-C02-injection-CH4 production"were also made in order to enhance the coalbed methane recovery.The C02 and CH4 composition.variation and phase separation curves were obtained.The results show that with the proceeding time of experiments,the competition rate of adsorption for C02 decrease, while that for CH4 increases.However,the reverse results were obtained for competition rate of desorption for these gas phases.It indicates that the adsorption of CO2 is prior to that of CH4. If the amount of injected C02 and／or the C02 concentration is higher,the rate of CH4 desorption and C02 adsorption would be higher.The results of our experiments are significant to commercial production of coalbed methane.

吴建光 , 叶建平, 唐书恒. 注入CO2提高煤层气产能的可行性研究[J]. J4.

Wu Jian-guang1 2, YE Jian-ping2, TANG Shu-hen3. A Feasibility Study on CO2 Injection for Enhancing the Coalbed Methane Recovery [J]. J4.