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Gas Transportation and Enhanced Coalbed Methane Recovery Processes in Deep Coal Seams: A Review

机译：煤层深层煤层气运移与强化煤层气采收工艺研究述评

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摘要

Coalbed methane (CBM) is a potential green energy supply for addressing the worldwide energy crisis. However, the recovery of economically viable amounts of methane requires the application of production-enhancement techniques. The greater effectiveness of enhanced coalbed methane (ECBM) recovery compared to traditional pressure depletion and hydraulic stimulation techniques has been identified in terms of higher CBM recovery with minimal pollution risk and the ability to contribute to CO2 sequestration. Gas transport behavior in a coal seam is the governing factor for ECBM recovery, which includes sorption/desorption and diffusion in the matrix and advective flux in cleats. The interactions among sorption, diffusion, and flow indicate the complexity and abstruseness of gas transport in coal. Therefore, the purpose of this paper is to provide comprehensive knowledge of the gas transport process in deep coal seams, particularly in relation to the ECBM process. According to the review, the dual-porosity system in coal provides sorption sites, and CO2 has much higher adsorption affinity to coal compared to that of CH4. Gas adsorption capacities for CH4 and CO2 are greatly reduced with temperature and the presence of moisture and increased with pressure. However, the adsorption capacity for supercritical CO2 decreases with increasing pressure due to changes in the associated CO2 properties. Regarding the diffusion process, CO2 has the highest diffusivity for its smallest kinetic diameter and the diffusion capability may be reduced with the existence of moisture for moisture adsorption induced coal swelling. Seam temperature has a positive influence on gas diffusion due to the enhanced kinetic energy and, the effect of pressure on diffusion is still open to debate. Upon sorption/diffusion, gas moves toward the cleat system through gas flow, which is controlled by permeability and is in turn greatly altered by gas adsorption/desorption-induced swelling/shrinkage effects during ECBM recovery. With high chemical reactive potential, CO2 creates the greatest coal matrix swelling for its higher adsorption capacity. Seam permeability increases with increasing injection pressure due to the associated pore expansion and reduces with enhanced swelling. Coal mass swelling reduces with increasing temperature due to the exothermic nature of gas adsorption. Dewatering coal seams increases coal permeability through the reduced moisture content that provides more sorption places for CO2 adsorption. However, this in turn may cause reduced permeability through the enhanced swelling effect.
机译：煤层气（CBM）是解决全球能源危机的潜在绿色能源供应。但是，要回收经济上可行的甲烷量，需要应用生产增强技术。与传统的压力消耗和水力增产技术相比，提高煤层气（ECBM）回收的有效性更高，这是因为煤层气的回收率更高，污染风险最小，并且有助于二氧化碳封存。煤层中的天然气运移行为是ECBM回收的决定性因素，其中包括基质中的吸附/解吸和扩散以及割理中的平流。吸附，扩散和流动之间的相互作用表明了煤中瓦斯输送的复杂性和复杂性。因此，本文的目的是提供有关深部煤层中气体输送过程的全面知识，尤其是有关ECBM过程的知识。根据评论，煤中的双孔隙系统提供了吸附位置，与CH4相比，CO2对煤的吸附亲和力更高。 CH4和CO2的气体吸附能力会随温度和水分的存在而大大降低，并随压力而增加。但是，由于相关CO2特性的变化，超临界CO2的吸附容量会随着压力的增加而降低。关于扩散过程，CO 2具有最小的动力学直径，具有最高的扩散率，并且随着水分的存在，水分吸收引起的煤溶胀会降低扩散能力。由于动能增强，煤层温度对气体扩散具有积极影响，而且压力对扩散的影响尚有争议。吸附/扩散后，气体通过气流向夹层系统移动，气流受渗透率控制，进而在ECBM恢复过程中被气体吸附/解吸引起的溶胀/收缩效应大大改变。具有较高的化学反应势，由于其较高的吸附能力，CO2可产生最大的煤基质膨胀。由于相关的孔隙膨胀，煤层渗透性随注入压力的增加而增加，而随着溶胀的增加而降低。由于气体吸附的放热特性，煤团膨胀随温度升高而降低。煤层脱水通过减少水分含量而增加了煤的渗透性，从而减少了水分含量，为二氧化碳的吸附提供了更多的吸附位置。然而，这反过来可能通过增强的溶胀作用而导致渗透性降低。

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  • 来源
    《Energy & fuels》 |2016年第11期|8832-8849|共18页
  • 作者

    Zhang X. G.; Ranjith P. G.; Perera M. S. A.; Ranathunga A. S.; Haque K.;

  • 作者单位

    Monash Univ, Deep Earth Energy Res Lab, Bldg 60, Clayton, Vic 3800, Australia;

    Monash Univ, Deep Earth Energy Res Lab, Bldg 60, Clayton, Vic 3800, Australia;

    Monash Univ, Deep Earth Energy Res Lab, Bldg 60, Clayton, Vic 3800, Australia|Univ Melbourne, Dept Infrastruct Engn, Bldg 176, Melbourne, Vic 3010, Australia;

    Monash Univ, Deep Earth Energy Res Lab, Bldg 60, Clayton, Vic 3800, Australia;

    Monash Univ, Deep Earth Energy Res Lab, Bldg 60, Clayton, Vic 3800, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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