التفاصيل البيبلوغرافية
| العنوان: |
超临界 CO2 作用下无烟煤孔隙结构演化时间效应规律. (Chinese) |
| Alternate Title: |
Time effect laws of pore structure evolution in anthracite reservoirs under the action of supercritical CO2. (English) |
| المؤلفون: |
葛兆龙, 张翔宇, 刘 浩, 侯昱东, 符文宇, 贾云中 |
| المصدر: |
Natural Gas Industry; 2024, Vol. 44 Issue 7, p97-108, 12p |
| Abstract (English): |
2 geological storage is one of the effective technologies to achieve emission reduction and reuse of abandoned mine resources, but the change of pore structures in coal seams after 2 injection has a time effect, and its evolution laws have a direct effect on the potential of 2 geological storage. In order to explore the real change situations of the pore structures in coal seams with the increase of the action time and to improve the calculation accuracy of the volume of 2 geologic storage, this paper selects the anthracite coal taken from the Nantong Mining Area of Chongqing as the research object to study the evolution laws of pore structures in the coal samples of this area at different action time of supercritical 2 by performing supercritical 2 adsorption experiment, low-temperature nitrogen adsorption experiment, X-ray diffraction test, nuclear magnetic resonance (NMR) test and scanning electron microscopy (SEM) test. And the following research results are obtained. First, after the action of supercritical 2, the change in the porosity of the coal samples mainly occurs within 7 days. The porosity increases by 3.20% after 7 days of the treatment, but only by 0.05% during the 7th to the 14th day. Second, with the increase of the action time, the specific surface area of the pores in the coal samples increases, but change amplitude reduces gradually, with an average daily increase of 19.74%-24.50% within 7 days and 2.37%-4.60% during the 7th to the 14th day, and the change rule follows approximately a logarithmic function. Third, the chemical reaction between supercritical 2 and coal leads to the dissolution of minerals, which increases the surface roughness of the coal body. The fractal dimension characterizing the roughness of the coal samples increases continuously with the increase of the action time. Fourth, the action of supercritical 2 can effectively change the porosity and surface morphology of the coal samples, which provides more 2 adsorption sites. The modification effect of supercritical 2 on the pore structure is more obvious within 7 days. In conclusion, the change of the pore structures in anthracite coal under the action of supercritical 2 will approach to be stable with the increase of the action time. The research results can provide a theoretical guidance for evaluating the potential of 2 geological storage in anthracite reservoirs. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
CO2 地质封存技术是实现减排和废弃矿井资源再利用的有效技术之一, 但煤层孔隙结构在 CO2 注入后的变化具有时间效应, 其演化规律将直接影响 CO2 地质封存潜力。为了探索作用时间增加后煤层孔隙结构变化的真实情况, 提高 CO2 地质封存量计算精度, 通过对重庆市南桐矿区无烟煤进行超临界 CO2 吸附实验, 低温氮气吸附实验, X 射线衍射测试, 核磁共振测试, 扫描电镜测试等实验, 研究了不同超临界 CO2 作用时间对该区域内煤样孔隙结构的演化规律。研究结果表明: ①超临界 CO2 作用后煤样孔隙度的变化主要 发生在 7 d 内, 处理 7 d 后煤样孔隙度增加了 3.20%, 7~14 d 内煤样孔隙度仅增加了 0.05%; ②随作用时间增加, 煤样孔隙的比表 面积增加但变化量逐渐减小, 7 d 内日均增长 19.74%~24.50%, 7~14 d 内日均增长 2.37%~4.60%, 其变化规律近似呈对数函数 关系; ③超临界 CO2 与煤产生的化学反应引起矿物质的溶解, 增大了煤体的表面粗糙度, 表征煤样粗糙度的分形维数随着作用时间 的增加持续增大; ④超临界 CO2 作用后能有效改变煤样的孔隙度及表面形貌, 为 CO2 吸附提供了更多吸附点位, 超临界 CO2 对孔隙 结构的改造效果在 7 d 内比较明显。结论认为, 超临界 CO2 作用下无烟煤孔隙结构的变化随作用时间增加最终会趋于稳定, 研究结 果可为无烟煤储层 CO2 地质封存潜力评价提供理论指导. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
