吴迪, 刘雪莹, 孙可明, 辛利伟, 苗丰. 热力耦合条件下超临界CO2驱替煤层CH4实验[J]. 煤田地质与勘探, 2019, 47(3): 85-90. DOI: 10.3969/j.issn.1001-1986.2019.03.014
引用本文: 吴迪, 刘雪莹, 孙可明, 辛利伟, 苗丰. 热力耦合条件下超临界CO2驱替煤层CH4实验[J]. 煤田地质与勘探, 2019, 47(3): 85-90. DOI: 10.3969/j.issn.1001-1986.2019.03.014
shu
WU Di, LIU Xueying, SUN Keming, XIN Liwei, MIAO Feng. Experiment on methane displacement in coalbed by supercritical carbon dioxide[J]. COAL GEOLOGY & EXPLORATION, 2019, 47(3): 85-90. DOI: 10.3969/j.issn.1001-1986.2019.03.014
Citation: WU Di, LIU Xueying, SUN Keming, XIN Liwei, MIAO Feng. Experiment on methane displacement in coalbed by supercritical carbon dioxide[J]. COAL GEOLOGY & EXPLORATION, 2019, 47(3): 85-90. DOI: 10.3969/j.issn.1001-1986.2019.03.014
shu

热力耦合条件下超临界CO2驱替煤层CH4实验

Experiment on methane displacement in coalbed by supercritical carbon dioxide

    摘要
  • 摘要: 为提高煤层CH4抽采效率，利用自主研发的实验系统，模拟超临界CO2在深部煤层中驱替CH4的过程，开展了不同温度和注入压力条件下原煤试样中超临界CO2渗流、吸附及驱替CH4实验。结果表明：在恒定温度条件下，随着超临界CO2注入压力逐渐增大，煤体渗透率提高，CO2吸附量增加。超临界CO2注入压力和温度对驱替效果影响显著。不同温度条件下，当超临界CO2注入压力从8 MPa增至12 MPa，CH4驱替量平均增长了0.076 cm3/g，CH4驱替效率增加了17%~23%，超临界CO2置换体积比呈线性递减趋势；相同注入压力条件下，温度每升高10℃，驱替效率平均增加8%，置换体积比平均下降0.5。研究结果为高效抽采煤层CH4和实现CO2封存提供理论依据。

     

    Abstract: Using self-made experimental system, experiments were performed on coal samples to study supercritical CO2 seepage, adsorption and CH4 displacement by supercritical CO2. Experimental results show that permeability and adsorption of supercritical CO2 in coal increase with CO2 pressures. Pressures and temperatures of CO2 influence the values of displaced CH4. Values of displaced CH4 increase by average 0.076 cm3/g and sweep efficiency rises by 17%-23% with the CO2 pressure increasing from 8 MPa to 12 MPa, while displacement volume decreases linearly. With the temperature rising by 10℃, sweep efficiency increases by 8% while displacement volume declines by 0.5 on average.

     

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