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| 论文编号: |
122214O120110224 |
| 第一作者所在部门: |
904组 |
| 中文论文题目: |
Study on the interactions of gases and coal: implications for the CO2-ECBM Process
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| 英文论文题目: |
Study on the interactions of gases and coal: implications for the CO2-ECBM Process
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| 论文题目英文: |
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| 作者: |
杨建丽
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| 论文出处: |
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| 刊物名称: |
Book of Abstracts, The 3rd Asia Pacific Caalbed Methane Symposium
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| 年: |
2011
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| 卷: |
0 |
| 期: |
0 |
| 页: |
51 |
| 联系作者: |
杨建丽 |
| 收录类别: |
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| 影响因子: |
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| 摘要: |
The sequestration of CO2 in unminable coal seams is considered as a potential option for CO2 geologic storage and at the same time expected to enhance the recovery of coalbed methane (CH4) (CO2-ECBM). The efficiencies of CO2 trapping and CH4 recovery are dependent on the efficiency of the displacement of CH4 by CO2, which is related to the interactions of gases (CH4 and CO2) and coals. CH4 is stored in the coal seams mainly by sorption. The injected CO2 can enhance the desorption of CH4 by competing for sorption sites and reducing the partial pressure of CH4. The sorption of CO2 on coal can induce swelling of the coal matrix, which may lower the permeability of the coal seams and reduce the injection rate of CO2. Furthermore, supercritical CO2 may extract some hydrocarbon components from the coal. Coal seams are usually saturated with water, in which CO2 dissolves to form carbonic acid, which may react with minerals in the coal seams. A series of important issues related to the CO2-ECBM process, i.e. the sorption capacity of coals with respect to CH4 and CO2, the swelling of coal at higher gas pressures, the permeability of the coal matrix, as well as the interaction of CO2 with coal, are studied by our research team. The sorption and swelling of coal blocks under different temperature, pressure and moisture content conditions were simultaneously determined in a modified manometric sorption setup. It was found that the swelling ratio for CO2 increased with the adsorbed amount up to about 3 mmol-gas/g-coal and then decreased slightly. The swelling ratio for CH4 increased with the adsorbed amount over the entire pressure range. The permeability of the coal plugs to He, Ar, CO2 and water under different gas pressure and confining stress conditions were investigated. The permeability coefficients of coal to gas were found to vary mainly with mean gas pressure and effective stress. An analytical equation combining these two factors was proposed to model the observed permeability data. The prediction made by this model may be extended to other conditions. The extraction behavoir of CO2 on the components of coal under different pressures and temperatures were studied. However, the amounts of organic compounds extracted by supercritical CO2 under the conditions studied, were negligible. Interestingly, the exposure of coal to CO2/water was found to increase the uptake of CO2 by coal. The comprehensive investigation of sorption, swelling, transport and chemical reactions is useful for the development of numerical modelling tools and the determination of parameters for CO2-ECBM reservoir simulation. |
| 英文摘要: |
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