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Experimental investigation of CO_2 injection into coal seam reservoir at in-situ stress conditions for enhanced coalbed methane recovery

机译：在地应力条件下向煤层储层注CO_2以提高煤层气采收率的实验研究

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摘要

CO2 geological sequestration is an effective method to reduce the concentration of CO2 in the atmosphere. The injection of CO2 into CH4-containing coal seams also named CO2-ECBM (CO2 Enhanced Coalbed Methane Recovery), allows the storage of CO2 and the enhancement of CH4 recovery. Due to complex geological environment of the site, dynamic variation of CH4 and CO2 can hardly be monitored in real time during CO2 injection into coal seams. Therefore, this paper conducted experimental studies were carried out on cuboid coal samples with a size of 300 * 70 * 70mm via a self-developed experimental device which can simulate in-situ stress and temperature conditions. In the experiment, different adsorbed gases (CH4 and CO2) were applied to determine the variation of permeability values under various load stresses and pore pressures. Results proved that the coal had greater adsorption capacity to CO2 than to CH4. The injected CO2 occupied the original adsorption site of CH4, thus leading to the rapid discharge of CH4. Meanwhile, real-time dynamic monitoring was also performed on gas parameters in coal under different gas injection pressures to obtain variation laws of pore pressure, gas flow rate and concentration at the outlet with the increment of injected CO2. The results reveal that with the increase of injected CO2, pore pressure tended to equilibrium while CH4 flow rate and concentration at the outlet gradually fall to zero. Therefore, CO2 injection into the coal mass can effectively improve the recovery of CH4. In addition, variations of gas flow rate and concentration at the outlet with the displacement ratio of gas volume under different gas injection pressures suggested that the enhancement of gas injection pressure boosted discharge efficiency of CH4 from the coal mass and CO2 consumption. Furthermore, inspired by the competition relationship between engineering efficiency and CO2 consumption, we think a reasonable and effective economic cost model can be established as an effective method to guide the selection of gas injection pressure in the future. Hence, the experimental results have guiding significance for better understanding and application of CO2-ECBM technology.
机译：CO2地质隔离是降低大气中CO2浓度的有效方法。将CO2注入也称为CO2-ECBM（CO2增强煤层气采收率）的含CH4煤层中，可以存储CO2和提高CH4采收率。由于现场地质环境复杂，在向煤层中注入CO2时，几乎无法实时监测CH4和CO2的动态变化。因此，本文通过自行开发的可模拟现场应力和温度条件的实验装置，对尺寸为300 * 70 * 70mm的长方体煤样品进行了实验研究。在实验中，使用了不同的吸附气体（CH4和CO2）来确定在各种载荷应力和孔隙压力下渗透率值的变化。结果证明，煤对二氧化碳的吸附能力大于对甲烷的吸附能力。注入的CO2占据了CH4的原始吸附位置，从而导致CH4的快速排放。同时，还对不同注气压力下煤中的气体参数进行了实时动态监测，得到了随注入CO2的增加孔隙压力，瓦斯流量和出口浓度的变化规律。结果表明，随着注入CO 2的增加，孔隙压力趋于平衡，而CH 4流量和出口处的浓度逐渐降至零。因此，将CO 2注入煤块中可以有效地提高CH 4的回收率。另外，在不同的注气压力下，出口气体流量和浓度随排量的变化而变化，这表明注气压力的增加提高了煤质和CO2消耗量对CH4的排放效率。此外，受工程效率和二氧化碳消耗之间竞争关系的启发，我们认为可以建立合理有效的经济成本模型，作为指导将来选择注气压力的有效方法。因此，实验结果对更好地理解和应用CO2-ECBM技术具有指导意义。

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  • 来源
    《Fuel》 |2019年第15期|709-716|共8页
  • 作者

    Liu Zhengdong; Cheng Yuanping; Wang Yongkang; Wang Liang; Li Wei;

  • 作者单位

    China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Natl Engn Res Ctr Coal & Gas Control, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Minist Educ, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221116, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    CO2 injection; ECBM; Adsorption capacity; Coal permeability; Injection pressure;

    机译：二氧化碳注入;ECBM;吸附能力;煤渗透率;注入压力;

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